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Article

Identification of Stripe Rust Resistance Genes in Common Wheat Cultivars and Breeding Lines from Kazakhstan

1
Institute of Plant Biology and Biotechnology, Almaty 050040, Kazakhstan
2
Research Institute of Biological Safety Problems, Gvardeiskiy 080409, Kazakhstan
*
Author to whom correspondence should be addressed.
Plants 2021, 10(11), 2303; https://doi.org/10.3390/plants10112303
Submission received: 15 September 2021 / Revised: 20 October 2021 / Accepted: 24 October 2021 / Published: 26 October 2021

Abstract

:
Stripe (yellow) rust, caused by Puccinia striiformis f.sp. tritici (Pst), is a fungal disease that presents one of the most serious threats to the wheat crops, causing severe yield losses worldwide, including Kazakhstan. The objectives of this study were to: (1) evaluate a winter wheat collection for stripe rust resistance during an adult plant growth stage, (2) identify the presence of selected Yr genes using linked molecular markers in wheat germplasm, (3) identify potentially useful resistant wheat genotypes among leading cultivars and advanced breeding lines. This study evaluated 70 winter wheat genotypes for stripe rust resistance. According to the field reactions, 42 entries (60%) had R or MR reactions including 27 breeding lines (38.6%) and 15 (21.4%) cultivars. Twenty-eight breeding lines/cultivars (40.0%) were susceptible in both years. According to the average coefficient of infection value (ACI) six genotypes were regarded as possessing high level of adult plant resistance. Cultivars/lines carrying Yr10 alone or in combination with other Yr resistance genes provided resistance to stripe rust. Eleven breeding lines showed <5% disease severity in both years. Linked marker analysis revealed the presence of several gene and gene complexes (Yr5, Yr10, Yr15, Yr17/Lr37/Sr38 and Yr18/Lr34). Among a collection of 70 winter wheat breeding lines and cultivars produced in Kazakhstan three stripe rust resistance genes (Yr10, Yr5 and Yr15) demonstrated high frequency occurrence (31.4%, 14.0% and 7.0%, respectively). The most abundant was gene Yr10 identified in 22 genotypes. It was followed by the Yr5 gene, which conferred resistance in 14 lines (20%) and Yr18 gene-11 lines (15.7%). Yr15 was identified in 7 genotypes. Yr17/Lr37/Sr38 gene complex was found in 2 entries. Among 70 evaluated germplasm sources, 42 disease resistant entries are potentially useful resistant wheat genotypes. These carriers of different Yr genes can be used directly in breeding programs to improve stripe rust resistance of winter wheat. Marker-assisted selection can be efficiently applied to develop wheat cultivars with effective gene combinations that would directly assist in developing durable resistance in Kazakhstan.

1. Introduction

World grain production has been increasing in recent years, but the global loss of wheat from diseases is 10% of the potential harvest (FAOSTAT data. http://www.fao.org/faostat/en/#data/QC, accessed on 23 November 2016). Wheat, Triticum aestivum L., is the most cultivated cereal crop, and is directly linked to food security. One of the most serious threats to the wheat crops is fungal diseases comprising of rusts causing severe yield losses worldwide [1]. Wheat production in Kazakhstan is seriously constrained due to rust diseases, including stem rust caused by Puccinia graminis f. sp. tritici Eriks., stripe rust caused by Puccinia striiformis Westend. f. sp. tritici and leaf rust caused by Puccinia triticina Erikss [2,3,4,5,6,7,8], as well as leaf spot diseases (tan spot and Septoria) [9,10,11,12,13,14].
Stripe, or yellow rust, Puccinia striiformis, is one of the most widespread and damaging diseases of wheat in Kazakhstan [3,15]. Stripe rust infection can occur anytime from one-leaf stage to plant maturity, provided that plants are still green [16]. This disease reduces the photosynthetic capacity, increases transpiration, and reduces the accumulation of organic matter, resulting in shriveled grain with low quality. Stripe rust of wheat has been reported in more than 60 countries and in all continents except Antarctica [16]. In recent years, major wheat producing countries have faced severe stripe rust epidemics leading to significant yield losses [1,17]. The capability of the pathogen for mutation and rapid generation turnover accelerates the development of races. The airborne spread of inoculum can reach a distance of hundreds of kilometers. Yahyaoui (2003) suggests that the main mechanisms of pathogen evolution in Central Asia are represented by a sequence of mutations and genetic recombination [18].
There have been frequent occurrences of stripe rust epidemics in many parts of the region of Central Asia and Kazakhstan [6,19,20]. Epiphytotic development of stripe rust caused by an abnormal amount of precipitation leads to severe crop reduction. In Kazakhstan, stripe rust attacked many commercial wheat cultivars causing severe infection in Kazakhstan. In 2002, it caused 30–40% loss of yield in the southeast region [2]. The stripe rust severities on winter wheat have substantially increased between 2001 and 2010 in Central and West Asia [21]. Continuous outbreaks of stripe rust in recent years are also reflected through the occurrence of four epidemics in different parts of Central Asia in 2009–2014 [20,22,23].
Disease caused serious damage to both yield and quality. Recent studies have shown that 20 to 40% of wheat grain yield losses could occur due to stripe rust on the susceptible varieties [24]. The breakdown of resistance in commercial cultivars suggests that the conventional selection improves resistance slowly. One reason for slow progress is the limited effectiveness of the selection technique to identify the presence of multiple resistance genes in breeding lines before releasing for commercial cultivation [6]. Additionally, a set of pathogen isolates that could help identify multiple resistance genes is not established for stripe rust in Central Asia. Hence, application of known molecular markers linked to stripe rust resistance genes could accelerate efforts to improve resistance.
To date, according to the Catalogue of Gene Symbols, more than 80 genes with official or temporary symbols for resistance to stripe rust have been identified [25]. However, the resistance effectiveness against stripe rust can be overcome by emergence of new pathogen races. Most of these genes are dominant, race-specific and therefore, do not provide durable resistance independently. Therefore, identification of novel sources of resistance in a cultivar is of foremost importance for effective disease control.
Only a few Yr genes such as Yr5 and Yr15 are effectively resistant to all known Pst races in China and around the world [26]. Diversity in Yr genes in commercial cultivars could play an important role in managing frequent stripe rust epidemics in the region. Kokhmetova et al. (2010) reported that the most effective resistant genes against stripe rust in Kazakhstan are Yr2+, Yr4+, Yr5, Yr10 and Yr15 [15]. Additionally, there are a few Yr genes that confer non-race-specific resistance, acting at the adult plant stage such as Yr18, which is a multi-pathogen resistance gene and confers part field resistance against stripe rust, leaf rust, stem rust, and powdery mildew have been used in breeding programs for a century and so far, no pathogen adaptability has been found [27].
The stripe rust resistance gene Yr5 was originally identified in hexaploid Triticum aestivum ssp. spelta var album (TSA). Macer (1966) located it on chromosome 2B and Law (1976) further localized it to the long arm of that chromosome, 21 cM from the centromere, is a race-specific R-gene effective at both seedling and all plant growth stages and located on the chromosome 2BL [28,29]. Yr5 confers resistance to almost all isolates of P. striiformis tritici in the world, except for Australia [30] and India [31]. Yr5 confers resistance to almost all isolates of P. striiformis tritici in Kazakhstan [6].
The dominant stripe rust resistance gene Yr10 was originally found in wheat line PI 178383 and cultivar Moro [32] and located on chromosome 1BS, 2 cM apart from Rg1 locus that confers brown glume colour [33] and 5 cM from locus Gli-1B [34]. This gene has been mapped in different loci on 1 and 6 groups of wheat chromosomes. Bariana et al., 2002 verified close association between Yr10 and Gli-B1 by genetic analysis of the cultivar Moro [35]. The Yr10 resistance gene continues to that provide effective resistance to stripe rust in many parts of the world. This gene has been reported effective against all races in China [32], India [36], Pakistan [37], Iran [38], USA [39] and in Kazakhstan [15].
The dominant stripe rust resistance gene Yr15 was identified in Triticum dicoccoides accession G-25 [40] and mapped on chromosome 1BS [41]. Currently, the main all-stage resistance genes which are used in breeding programs and are effective against all currently identified races in the U.S. are Yr5, Yr15 and Yr45 [42]. Yr15 confers broad-spectrum resistance against a worldwide collection of more than 3000 genetically diverse Pst isolates, including modern races, such as ‘Warrior’ (race DK09/11), which is currently threatening wheat production [43]. Our previous studies have shown that Yr15 is still effective against stripe rust isolates Kazakhstan [3].
The Yr17, Lr37 and Sr38 rust resistance genes, which confer resistance in wheat against stripe, leaf and stem rust, have been used by breeders in different parts of the world [44,45]. These linked resistance genes are located in a 2NS/2AS translocation [46]. Rust races with virulence to Yr17 and Lr37 have been identified in different countries but this gene cluster still provides resistance to a wide range of races and is useful in combination with other rust resistance genes [47].
The locus Lr34/Yr18/Pm38 confers partial and durable resistance against the devasting fungal pathogens leaf rust, stripe rust, and powdery mildew. Yr18/Lr34 genes have been used in breeding programs for a century and so far, no pathogen adaptability has been found [27]. The gene complex Yr18/Lr34 are known as “slow rusting gene” which provides durable and non-specific APR and located on the short arm of chromosome 7D. The high durability of Yr18/Lr34 explains by the race unspecific adenosine triphosphate-binding cassette-transporter [48]. Yr18/Lr34 is expressed in adult plants during the critical grain-filling stage and is most effective in the flag leaf. Wheat cultivars containing these genes occupy more than 26 million ha in various developing countries alone and contribute substantially to yield savings in epidemic years [49].
Phytopathological methods based on symptomology are not always effective for the identification of resistance genes. Field evaluation is expensive, time-consuming and highly affected by environmental conditions. A diversified and effective resistant gene resource must be the basis of breeding wheat cultivars with rust resistance. Incorporation of the resistance genes is an eco-friendly system that does not place any cost burden on the growers. Nowadays, various molecular markers have been widely used in plant genetic mapping and marker-assisted selection (MAS). Molecular markers associated with disease resistance will be a more effective way to identify disease resistance factors. The advent of relatively inexpensive, high throughput molecular marker platforms results in marker-assisted selection (MAS) becoming a viable approach to tracking resistance genes [26].
The objectives of this study were to: (1) evaluate a winter wheat collection for stripe rust resistance during the adult plant growth stage, (2) identify the presence of selected Yr genes using linked molecular markers in wheat germplasm, (3) identify potentially useful resistant wheat genotypes among leading cultivars and advanced breeding lines.

2. Results

2.1. Field Evaluation of Adult Plant Resistance

Uniform and consistent stripe rust development was observed for adult plant resistance in the field evaluation. ANOVA showed significant differences among genotypes (p < 0.001) to the stripe rust severity in both growing season (Table S1). Stripe rust severities in both years (2019 and 2020) are shown in Table 1. Stripe rust development varied greatly among the wheat entries. According to the field reactions, 42 entries (60.0%) had R and MR reactions including 29 breeding lines (41.4%) and 13 (18.6%) cultivars. Among 70 genotypes 22 breeding lines (31.4%) and 6 cultivars (8.6%) were susceptible in in both years. Eleven breeding lines (1777Darya/Tungysh-2, 12-12/1613MP-2011/1027/AVS/Ulugbek/Egemen, 1017/103F3/N91/5353/ Egemen, Rils Almaly/Anza, 5-ICARDA-IPBB-2013, 5221/Almaly, Naz/GF55, #23/Kupava-7, #23/Kupava-12, #23/Kupava-24) showed <5% disease severity in both years.

2.2. Identification of Yr Genes with Molecular Markers and Stripe Rust Resistance in the Sources of Resistance

Linked marker analysis revealed the presence of several genes and gene complexes (Table 1). Detection of five Yr genes in wheat genotypes was carried out using 9 Yr gene linked markers.
Three sequence tagged site (STS) markers S19M93 [50], S23M41 [50], and STS-9/10 [51]. Linked with yellow rust resistance gene Yr5 were used to confirm these markers in wheat genotypes. S19M93-140 located at 0.54 cM from Yr5 amplified one 100 bp allele, and S23M41 amplified one 275 bp allele. Both S19M93 and S23M41 are closely linked to Yr5 gene and these markers have been reported as co-segregating with Yr5 gene [50]. Another STS marker, STS-9/10, developed by Chen et al. (2003), co-segregate with the Yr5 locus, located at 0.7 cM from Yr5 and amplified fragments of 439 or 433 bp for the resistant or susceptible plants, respectively [51]. These molecular markers were chosen to screen 70 cultivars/lines for the presence of Yr5 sources. Screening with S19M93 marker produced the expected 100 bp band associated with Yr5 gene in 18 genotypes (25.7%), as well as in the control line Avocet S*6/Yr5 (Cat# 4, 9, 13, 14, 20, 33, 34, 44, 46, 47, 50, 51, 58, 63, 66, 67, 69) (Figure S1). The other 52 wheat genotypes (74.3%) failed to amplify the gene. As an example, the PCR results using S19M93 marker are shown in the Figure S1. STS marker S23M41 amplified product size 275 bp linked to Yr5 gene was observed in 14 entries (27.1%) (Cat# 4, 9, 13, 14, 20, 33, 34, 44, 46, 58, 63, 66, 67, 69) (Figure S2). STS marker, STS-9/10 was chosen to screen wheat entries for the presence of Yr5 sources. The plant materials amplified fragments of 439 or 433 bp for the resistant or susceptible plants, respectively. Polymorphism was better revealed after DpnII digestion of the PCR products. The Yr5 sources had bands with sizes 289 bp, while non-carriers of Yr5 amplified 182 bp PCR products (Figure S3). Fifteen genotypes (Cat# 3, 4, 9, 13, 14, 20, 33, 34, 44, 46, 47, 58, 63, 66, 67, 69) amplified the same band as isogenic line Avocet S*6/Yr5 (Table 1). As a result of confirming the presence of Yr5 with all three Yr5 linked markers, 14 genotypes (20%) were identified as carriers of Yr5 (Cat# 4, 9, 13, 14, 20, 33, 34, 44, 46, 58, 63, 66, 67, 69).
The gene Yr10 identified in 22 genotypes. Marker Xpsp3000 located on the end of chromosome 1BS linked with the stripe rust resistant gene, Yr10, with a distance 1.2 cM [32]. The fragment 260 bp was a specific band closely linked to the stripe rust resistance gene Yr10. The microsatellite marker Xpsp3000 is inherited in a co-dominant manner, and can be used to identify genotypes of individuals at any growth stage [52] for marker assisted selection of Yr10 [32,35]. Considering the above, the Xpsp3000 marker is suitable for the identification of resistant genotypes at different stages of plant development. Using this marker, the fragment 260 bp was amplified in tested entries. The molecular marker linked to Yr10, Xpsp3000 amplified fragment size 260 bp in 22 genotypes (Cat# 5, 7, 13, 23, 28, 30, 32, 33, 34, 36, 37, 39, 42, 45, 46, 52, 54, 58, 60, 61, 65, 68), while the remaining 48 genotypes were lacking in Yr10 (Figure S4, Table 1). In addition to the SSR Xpsp3000 marker, the SCAR marker linked to Yr10 with a genetic distance of 0.5 cM [53] was chosen to screen the 70 entries in our study. The fragment 200 bp was a specific band closely linked to the stripe rust resistance gene Yr10. The fragment 180 bp was a non-specific band and was amplified in most of the tested wheat materials. The positive control, Avocet S*6/Yr10 showed 200bp band, and susceptible check Avocet S a 180 bp band (Table 1, Figure S5). Twenty-three genotypes (Cat# 5, 7 13, 23, 28, 30, 32, 33, 34, 36, 37, 38, 39, 42, 45, 46, 52, 54, 58, 60, 61, 65, 68), amplified the same band as Yr10 carrier isogenic line. In addition to 23 homozygous entries, four segregating for Yr10 locus (Cat# 47, 48, 49, 51) have been detected. Total, approximately 38%) of all 70 entries (27 genotypes) assayed with SCAR marker in this study were predicted to possess Yr10. (Figure S5, Table 1). Wheat genotypes that confirmed the presence of this gene as a result of PCR with both Xpsp3000 and Yr10SCAR markers were assigned to carriers of the Yr10 gene. On this basis, 22 genotypes (31,4%) (Cat# 5, 7, 13, 23, 28, 30, 32, 33, 34, 36, 37, 39, 42, 45, 46, 52, 54, 58, 60, 61, 65, 68) carried Yr10 gene.
Molecular markers linked to the Yr15 gene were identified by Sun et al. (1997), Peng et al. (2000) and Murphy et al. (2009) [54,55,56]. The Yr15 gene was mapped to a 6.4 cM interval flanked by marker Xbarc8, located 3.9 cM to the distal side, and by Xgwm413 located 2.5 cM to the proximal side. It was determined that Xbarc8 and Xgwm413 are diagnostic of the Yr15 gene across almost all backgrounds tested [56]. In the present study these two markers were used to screen among the 70 entries for Yr15 detection. Xbarc8 marker amplified 2 alleles (257 and 221 bp). The expected size of the fragment amplification for locus Xbarc8 coupled to the resistant allele of Yr15 gene was 221 bp (Figure S6, Table 1). Out of 70 genotypes tested for Yr15 the expected PCR product was amplified in eight genotypes (Cat# 3, 29, 30, 40, 41, 42, 50, 53), including seven homozygous entries and one genotype segregating for Yr15 locus. The fragment 257 bp was a non-specific band and was amplified in the rest 62 wheat entries. Screening with Xgwm413 marker produced the expected 96 bp band associated with the Yr15 gene in seven genotypes (Figure S7, Table 1). On the basis of confirmation of Yr15 with both Xbarc8 and Xgwm413 markers, seven genotypes (10%) (Cat# 3, 29, 30, 40, 41, 42, 53) carried the Yr15 gene.
The presence of the Yr17 gene in wheat genotypes was studied using the VENTRIUP/LN2 marker is associated with Triticum ventricosum chromosome 2NS translocated to the short arm of bread wheat chromosome 2AS [47]. Of the 70 cultivars/lines identified to carry these resistance genes in our study, two genotypes (114Novosibirskaya-22/Omskaya37/28 and 425/Renan) amplified 262-bp fragment, indicating the presence of the Yr17/Lr37/Sr38 resistance gene block (Figure S8, Table 1).
A specific co-dominant STS marker csLV34, which is a bi-allelic locus, was used to detect the presence/absence of the gene complex Yr18/Lr34. Genetic linkage between csLV34 and Yr18/Lr34 was estimated at 0.4 cM [57]. The robustness of the csLV34 marker in postulating the likely occurrence of Lr34/Yr18 across a wide range of germplasm was earlier confirmed [52]. The 150-bp and 229-bp bands indicated the presence and absence of the Yr18 gene, respectively. Marker analyses indicate that amplification products correspond with the homozygous resistant allele of Lr34/Yr18 gene were detected in 11 wheat entries (Cat# 2, 3, 9, 13, 20, 35, 54, 58, 62, 64, 70), accounting for 15.7% of studied genotypes (Figure S9, Table 1).
Wheat germplasm was classified into four groups according to ACI value. Wheat entries with ACI values of 0–10, 11–20, 21–30, 31–60 were regarded as possessing high, moderate-resistant, moderate-susceptible and low levels of adult plant resistance. The 2-year average ACI values for the entries ranged from 3.44 and 8.04 for the 1st (boot stage) and the 2nd (milk stage) observations, respectively. Details of ACI data in wheat genotypes (carriers of Yr genes) are presented in Table S2.
The ACI values of susceptible control Morocco and Avocet S reached 55.0 and 90.0 which shows high disease pressure. The study of resistance isogenic lines Avocet S*6/Yr5, Avocet S*6/Yr10, Avocet S*6/Yr5 indicated that resistance genes Yr5, Yr10 and Yr15 showed a high level of resistance to stripe rust during two growing seasons (0–1.5 ACI values during the 2 years). Resistance of Yr17 and Yr18 genes was lower (ACI values 5–14 and 1.5–6) for two genes, respectively (Table S2).
Out of 42 carriers of Yr genes 35 wheat entries possessed ACI value of 0–20 conferred high and moderate resistant level of adult plant resistance, seven had ACI regarded as possessing either MS or S reactions.
The most resistant cultivars (0 and 10.0 average ACI values) were 30 entries. Six genotypes (#23/Kupava-7, 5-ICARDA-IPBB-2013, Naz/GF55-2, #23/Kupava-12, #23/Kupava-24, #23/Kupava-5) were highly resistant (ACI values: 0 and 1.0); four of them carrying Yr10 alone or in combination with Yr5 or Yr15. The line #23/Kupava-12 consist Yr5 alone, wihle #23/Kupava-5 had Yr15 gene.
Amongst the next 24 resistant genotypes (ACI value: 2–10) three entries possessing the 3 Yr genes were detected: 114Novosibirskaya-22/Omskaya37/28 (Yr5, Yr17, Yr18), while Mereke-70 and 1777Darya/1724F1-1581/807F4 /Naz/Umanka/Almaly/Zimorodok-1 both combining Yr5, Yr10, Yr18 genes. In three entries: Taza/MK 3750-2 (Yr, Yr10), 1010/93f3/N23/Kupava/Mereke70-1 (Yr5, Yr18) and Karasay (Yr10, Yr18), two Yr genes in each were found. The rest of the genotypes had one Yr gene each. In a group of five genotypes with a moderately resistant reaction (ASI 12 for the 2nd observation), four entries had the Yr10 gene, and the Almaly cultivar had only one gene (Yr18).
Cultivars/lines carrying Yr10 alone or in combination with other Yr resistance genes in most cases provided high level of resistance against stripe rust (Table S2). The genotypes with three Yr genes (Yr5, Yr17, Yr18 and Yr5, Yr10, Yr15) showed low ACI (2–7) and were regarded as possessing high level of resistance.
According to the ACI value Yr18 gene provided high level of resistance in seven lines, but four entries (Almaly/GF70, 425/GF55-1, Kupava and Almaly/GF92), carrying this gene demonstrated MS and S reactions to stripe rust. (Table S2). Analysis of ACI data indicates that the effectiveness of Yr17/Lr37/Sr38 depended on the genetic background and the combination of genes. In one genotype 114Novosibirskaya-22/Omskaya37/28 presence of this gene complex in the combination with Yr5 and Yr18/Lr34 provided a high level of resistance, but in the line 425/Renan, a Yr17/Lr37/Sr38 susceptible reaction against stripe rust was observed.
Thus, one or more Yr gene and gene complex were detected in 42 genotypes, including 27 breeding lines and 15 cultivars of wheat. Several resistant genotypes did not possess any of the five Yr gene and gene complex. As a rule, genotypes identified as resistant under field conditions, had one or more Yr gene. The Yr10 gene can be considered the most effective in the studied germplasm, which provided a highly resistant and moderately resistant level of resistance in 22 wheat genotypes (31.4%). It was followed by the Yr5 gene, which conferred resistance in 14 lines (20%) and the Yr18 gene-11 lines (15.7%). Among 70 evaluated germplasm sources, 42 disease resistant entries were potentially useful resistant wheat genotypes.

3. Discussion

Rust diseases are the perennial problem for winter wheat in Central Asia and the Caucasus [58]. Evaluation stripe rust resistance includes artificially inoculated greenhouse experiments and both artificially and naturally infected field experiments. These methods can be time consuming, are limited to the growing season, and require maintenance of the various stripe rust races to detect specific genes for resistance [51,59]. In addition, races of P. striiformis that differentiate Yr5 and Yr15 have not been identified so it is currently not possible to use greenhouse or field resistance phenotyping to identify genotypes possessing both resistance genes, unless they are identified using progeny testing and test crosses. Alternatively, as for many traits, marker-assisted selection (MAS) is an efficient tool to select for and predict phenotype [56].
The study of winter wheat germplasm allowed to evaluate the promising lines and cultivars for genetic and breeding programs aimed at improving stripe rust resistance of wheat in Kazakhstan. In this study, 51 promising wheat breeding lines, developed by the Institute of Plant Biology and Biotechnology, as well as 19 widely grown cultivars in Kazakhstan were tested with linked markers for some Yr genes. These 70 wheat genotypes greatly differ in stripe rust severity recorded at adult plant stage in the field. Eleven breeding lines showed <5% disease severity in both years, suggesting their potential value as sources of resistance. However, several genotypes (Naz/GF55-2, Sanzar8/BWKLDN9, 1777Darya/Tungysh-1, 1777Darya/Tungysh-3, 1017/103F3/N91/5353/Egemen-1, and 1011/94F3/N23/Knyazhna/Naz-1) showed high stripe rust severity in both years, suggesting their low potential value as sources of resistance. None of the five genes were detected in a few highly resistant genotypes (1777Darya/Tungysh-2, 12/1613MP-2011/1027/AVS/Ulugbek/Egemen, 1017/103f3/N91/5353/Egemen-1, Rils Almaly/Anza and 5221/Almaly) suggesting that additional Yr genes are conferring resistance in these genotypes. This demonstrates the diversity of Yr genes in the gene pool comprising of recently released cultivars and advanced breeding lines of winter wheat in Kazakhstan.
Molecular markers are useful for identifying lines with multiple genes and for pyramiding multiple resistance genes, which is difficult and sometimes impossible to do using only phenotypic data [60]. In different previous studies, the sources of Yr resistance genes (Yr9, Yr5, Yr10, Yr15 and Yr18 genes) were identified in winter wheat breeding material [37,61,62]. The result of a study by Zheng et al. (2017) showed effective resistance of Yr15 and Yr65 genes; significant additive effects were observed in some gene combinations, such as Yr9+Yr18 and Yr30+Yr46 [63].
Deployment of specific gene combinations provides durable and improved resistance versus using single genes because a single specific gene is subject to become susceptible due to genetic shifts in the pathogen [64]. In our study, nine closely linked markers specific for 5 Yr genes were used to detect the presence of Yr5, Yr10, Yr15, Yr17 and Yr18 genes among the wheat genotypes and evaluate their effect on the resistance to stripe rust. For better accuracy of results, the Yr5 gene was amplified by using three linked markers, and Yr10 and Yr15–by using two linked markers. The combined results of all the markers were used for confirming the presence of Yr genes.
In our research, molecular screening of spring wheat cultivars showed contrasting differences in the frequencies of five important Yr genes (Yr5, Yr10, Yr15, Yr17 and Yr18). Three genotypes (114Novosibirskaya-22/Omskaya37/28, Mereke-70 and1777Darya/1724F1-1581/807F4 /Naz/Umanka/Almaly/ Zimorodok-1) were identified with maximum 3 Yr genes followed by 2 Yr genes in eight genotypes (#23/Kupava-7, Naz/GF55-2, #23/Kupava-24, Taza/MK 3750-2, 1010/93f3/N23/Kupava/Mereke70-1, Karasay, Naz/GF55-3 and 425/GF55). These genotypes exhibited resistance response at the field.
Among a collection of 70 winter wheat breeding lines and cultivars produced in Kazakhstan three stripe rust resistance genes (Yr10, Yr5 and Yr15) demonstrated high frequency occurrence, 31.4%, 20.0% and 10%, respectively. These stripe rust resistant genes showed evidence of providing adequate protection in the investigated wheat entries (<20% disease severity). This supports previous reports on varietal resistance [20] and that the improved stripe rust resistant winter wheat germplasm is increasingly becoming available in Central Asia [6,23].
In terms of the resistance spectrum, Yr5 has broad-spectrum resistance to stripe rust [30,65] and confers resistance to almost all isolates of P. striiformis tritici in the world, except for Australia [30] and India [31]. Yr5 is found to be effective against all rust virulent races in North America [51,66], Iran [67], China [16], India [31,36], Turkey [68] and Kazakhstan [6]. As a result of our research 14 genotypes (20%) were identified as carriers of Yr5. As Yr5 is a race-specific seedling resistance gene, it should be used in combination with other effective genes and/or with race non-specific adult-plant resistance genes. Such a combination could provide durable resistance [69]. In our studies, the Yr5 gene provided a high level of protection against the pathogen in combination with the Yr10 (Cat # 27,15, 31,7,16), with the Yr18 (# 6, 9, 30, 31, 7) and in combination with APR genes Yr17 and Yr18 (# 6).
The Yr10 gene is found race specific and has been reported effective against all races in China [32], Iran [67], Pakistan and USA [66]. No virulence for Yr10 has been found also in Kazakhstan [15]. In the present study, Yr10 was detected in 22 cultivars/lines. Previously, the Yr10 gene was postulated in the Adir cultivar as a result of a genetic segregation analysis [15]. In this study using marker analysis the previous finding was confirmed in the cv Adir, as well as in the line with this cultivar in their pedigree (Adir/Yr2). The presence of Yr10 was confirmed in the breeding lines derived from the spliting populations. For instance, from the population Naz/GF55 three lines (Naz/GF55-2 Naz/GF55-3 and Naz/GF55-4) were selected as the carriers of Yr10; the source of this gene was cv Naz, confirmed in a previous study [70]. The same results were obtained in the line #46 (#23/Kupava-24) with identified Yr10, in the pedigree of which the presence of this gene was confirmed. Earlier, in the line #23 [Brundage/Naz/Mereke70], three stripe rust resistant genes (Yr5, Yr10, Yr18) were identified (Annual report, project 2120-GF4, Kokhmetova et al., unpublished data). So, the Yr10 gene was the most abundant in this research (31.4%).
Abundance of Yr10 among the genotypes in this study is expected, considering that many advanced breeding lines have originated from IPBB germplasm, which have sources of the Yr10 gene in their pedigree. These include cultivars Naz, Mereke70, Matay which are carriers of the Yr10 gene [6]. Crosses aimed at the introduction of the Yr5 gene, carried by Triticum spelta album from the IPBB collection, cultivar Zimorodok, as well as the isogenic line Avocet S*6/Yr5. This made it possible to develop breeding lines carrying the Yr5 gene. Seven advanced breeding lines carrying the Yr15 gene were developed on the basis of crossing the target wheat germplasm with the isogenic line Avocet S*6/Yr15. The breeding line 1777Darya/1724F1-1581/807F4/Naz/Umanka/Almaly/Zimorodok-1 and cultivar Mereke70 had the highest number of resistance genes (Yr5, Yr10 and Yr18). Field evaluation of breeding material demonstrated that these three genes are effective. The resistance of five breeding lines was due to the two gene combinations: 1010/93F3/N23/Kupava/Mereke70-1 (Yr5, Yr18), 114Novosibirskaya-22/Omskaya37/28 (Yr5, Yr17), #23/Kupava-24 (Yr5, Yr10), Naz/GF55-2 (Yr10, Yr15), and #23/Kupava-7 (Yr10, Yr15). Among race specific genes Yr5, Yr10 and Yr15 are still protective against current predominant races in Kazakhstan. The result obtained indicates the efficiency of incorporating the stripe rust resistance genes in breeding material.
Currently, the main all-stage resistance genes which are used in breeding programs and are effective against all identified races in the U.S. are Yr5, Yr15 and Yr45 [42]. Our previous studies have shown that genes Yr5 and Yr15 are also effective against stripe rust isolates in Kazakhstan [15]. On the basis of confirmation of Yr15 with both Xbarc8 and Xgwm413 marker, seven genotypes (10%) carried the Yr15 gene.
The yellow rust resistant gene Yr17 linked to Lr37 is still effective against yellow rust in some regions and may explain the popularity of this gene complex. Although virulence for Lr37 has occurred in Europe and Australia, this gene is still recommended for breeding in many countries, including Russia and Kazakhstan [71,72]. The genes Yr17 and Yr18 were found in the current study much less frequently than Yr10 and Yr5: Yr17 and Yr18 were detected at a frequency of 2.8% and 11%, respectively. The results obtained by Ullah et al., 2016 indicates that most of the line applied in their study lack this alien chromatin [37]. Madenova et al. (2016) identified one genotype with Lr34/Yr18 genes and two genotypes with complex genes Lr37/Sr38/Yr17 [73]. Our results also showed a similar trend with these findings and Yr18/Lr34 gene was observed in 11 genotypes and Yr17/Lr37 in 2 genotypes.
The broad sense heritability (hb2) estimates for stripe rust across years were high (from 0.86 to 0.89) indicating that resistance to stripe rust can be improved by selection (Table S1). Similar heritability estimates for disease reaction have been reported by Singh et al. (2019) and Genievskaya et al. (2020) [74,75].
The molecular markers are a convenient and efficient approach to identify effective stripe rust resistance genes in cultivars and lines, and particularly so where a well-characterized pathogen collection is not available for multi-pathotype assessments. Since the evaluated entries included germplasm, coming from a breeding program directed to stripe rust resistance improvement and many crosses included CIMMYT-developed germplasm in their pedigree, they are likely to have diverse resistance gene constitutions. Among these sources, 42 disease resistant entries, which are the carriers of different Yr genes, can be used directly in breeding programs to improve stripe rust resistance of winter wheat. Marker-assisted selection can be efficiently applied to develop wheat cultivars with effective gene combinations that would directly assist in developing durable resistance in Kazakhstan.

4. Materials and Methods

4.1. Plant Material

This study assessed 70 winter wheat genotypes, including 19 cultivars and 51 elite breeding lines from Kazakhstan (Table 1), which were evaluated for Puccinia striiformis resistance in the field tests and in molecular screening for presence of Yr genes. This germplasm is produced or used in breeding programs of Kazakhstan. The highly susceptible control cultivar Morocco as well as the near isogenic lines (NILs) of cv. Avocet S NIL Yr5/6* Avocet S, NIL Yr10/6* Avocet S, NIL Yr15/6* Avocet S and (NILs) of cv. Thatcher: NIL Lr37 TC*6/VPM (RL 6081) and NIL Lr34 TC*6/PI58548 were also used in both tests.

4.2. Experimental Site

Evaluation of field resistance to stripe rust was carried out under conditions of the Kazakh Research Institute of Agriculture and Crop Production (KazNIIZiR), (Almalybak, 43°13′09″ N, 76°36′17″ E, Almaty region) in Southeast Kazakhstan, Almaty region, during 2019 and 2020 cropping seasons. Each entry was planted in 1 m2 plot in mid-September. Experiments were conducted with a completely randomized design with two replicates in 1 m2. The stripe rust susceptible cultivar Morocco was planted in every 10th row and as a spreader border around the nursery to ensure uniform infection. Fertilizer treatments, 60 and 30 kg/ha of N and P2O5, respectively, and other management practices corresponded to those normally recommended for the region [76]. Annual rainfall ranged from 332 to 644 mm during the 2 years. Experimental plants were sown in 1 m2 plots in mid-April every two experimental years. Weather conditions in Almaty in 2019 and in 2020 were favorable for the development of stripe rust, and the infection on susceptible checks reached 20S and 40S, respectively; however, there was a severe late development of stripe rust reaching 80% on susceptible check Morocco. So, the growing seasons were favorable for pathogen infection and disease development. Mean daily temperature and relative humidity showed similar trends in both years (Table S3). The average maximum air temperature for mid-May in 2019 and 2020 reached 31.3 and 32.5 °C, respectively. From April to June 2019, mean daily temperature was 11.4, 16.6, and 21.6 °C, respectively, and in 2020, 11.4, 16.6, and 21.8 °C. From April to June 2019, the monthly rainfalls and average relative humidity (RH) were 168, 39 and 72 mm, and 59.5%, respectively, and in 2020, 140, 74, 30 mm, and 57.3% (www.pogodaiklimat.ru/monitor.php accessed 15 June 2021)—conditions highly conducive for stripe rust infection and development.

4.3. Field Evaluation of Adult Plant Resistance

Infection type and severity data were recorded in late May and early June when the plots were at boot and milk stages, respectively. The time of second evaluation was also determined when rust severity on the susceptible control Morocco reached >60%. In mid-April 2019, stripe rust induced susceptible cultivars Morocco and Avocet S were inoculated with mixed races of Pst at seedling stage in the field in Kazakhstan to serve as spreader of stripe rust pathogen to the experimental plots. Morocco and Avocet S were planted in every 10th row and as spreader border around the nursery to ensure uniform infection. The material was screened in natural conditions and no artificial inoculation was carried out. The experiment was conducted using randomized complete block design with three replications and recommended cultural practices were used for trial management.
Scoring of stripe rust symptoms was performed according to the method developed at the CIMMYT [77]. Both infection type and severity data were recorded in late May and early June when the crops were at boot and milk stages, respectively, when severity on the susceptible check reached >60%. Five infection types described as the following: 0—immune (no uredia or other symptoms of disease infection); R—resistant (uredia minute, supported by distinct necrotic areas); MR—moderately resistant (uredia small to medium, in green islands surrounded by chlorotic tissue); MS—moderately susceptible (uredia medium in size, no necrotic but chlorotic areas may be present); and S—susceptible (uredia large, no necrosis but chlorosis may be evident). Stripe rust severities were recorded on three replications. For the replicated data means were calculated. Partial resistance in the field was evaluated at boot and milk stages accordingly, using the modified Cobb scale [78], as well as the coefficients of infection (CI) and the average coefficient of infection (ACI). CI was calculated by multiplying the severity values by the constant values for infection types, based on: R = 0.2, MR = 0.4, MS = 0.8 and S = 1.0 [79]. The genotypes showing terminal ratings ≤20% stripe rust severity was classified as resistant. ANOVA was analyzed using R statistical software (R Core Team, 2018), using replications as fixed effect and entries as random effect [80]. The least significant difference (LSD) test was used for significance of differences between the means. The broad sense heritability index, describing the proportion of phenotypic variation due to genetic factors, was calculated based on the ANOVA outcome as hb2 = SSg/SSt, where SSg is the sum of squares for genotype and SSt is the total sum of squares (Table S1).

4.4. DNA Extraction and Identification of Yr Genes with Molecular Markers

A set of 70 winter wheat genotypes including released cultivars and advanced breeding lines was used in the study. The markers linked to five Yr genes and gene complexes (Yr5, Yr10, Yr15, Lr34/Sr57/Yr18 and Lr37/Sr38/Yr17 were used. Genomic DNA was extracted from fresh leaves of single plants at the two-leaf seedling stage for each genotype using the CTAB method [81]. The polymerase chain reaction (PCR) method was used for identification of Yr resistance gene carriers. Wheat genotypes in which the resistance genes had been previously identified were used as a positive control, while samples in which resistance genes had not been previously detected were used as a negative control. Specific recommended protocols were used for primers linked to different Yr genes. The presence of molecular markers to resistance genes Yr5 (S19M93, S23M4 Yr5STS-9/10) [50,51], Yr10 (Xpsp3000, Yr10SCAR) [32,53], Yr15 (Xbarc8, Xgwm413) [55,82], Lr37/Sr38/Yr17 (Ventriup/LN2) [57] Lr34/Sr57/Yr18 (csLV34) [47] and was determined according to the procedure outlined by Smith et al. [50], Chen et al. [51], Wang et al. [32], Shao et al. [53], Peng et al. [55], Helguera et al. [47] and Lagudah et al. [57] (Table 2). The Yr5 gene carriers were detected based on PCR using the STS-9/10 marker [51]; for this marker, 0.5 µL (5U) of restriction enzyme DpnII and 1.3 µL of 10xbuffer for DpnII (new England Biolabs, Beverly, MA, USA) were added to the remaining 10 µL of PCR product. Samples were incubated at 37 °C for 2 h and digestion products were separated in 2.5% (w/v) agarose gels.
Primers and annealing temperature conditions of polymerase chain reaction (PCR) were carried out as described for each Yr gene in the references (Table 2). PCR reactions were performed in a Bio-Rad T100TM Thermal Cycler (Bio-RAD, Hercules, California, USA). The PCR mixture (25 µL) contained 2.5 µL of genomic DNA (30 ng), 1 µL of each primer (1 pM/µL) (SigmaAldrich, St. Louis, MI, USA), 2.5 µL of dNTP mixture (2.5 mM, dCTP, dGTP, dTTP and dATP aqueous solution) (ZAO Sileks, Sayansk, Russia), 2.5 µL MgCl2 (25 mM), 0.2 µL Taq polymerase (5 units µL) (ZAO Sileks, Russia), 2.5 µL 10X PCR buffer and 12.8 µL ddH20. PCR amplification was performed with a Mastercycler (Eppendorf, Hamburg, Germany) with initial denaturation at 94 °C for 3 min, 45 cycles: 94 °C for 1 min, annealing at 60 °C for 1 min, 72 °C for 2 min and final elongation at 72 °C for 10 min. The amplification products were separated on 2% agarose gel in TBE buffer (45 mM Tris-borate, 1 mM EDTA, pH 8) [83] with the addition of ethidium bromide. To determine the length of the amplification fragment, a 100-bp DNA ladder (Fermentas, Vilnius, Lithuania) was included. Results were visualized using the Gel Documentation System (Gel Doc XR+, BIO-RAD, Hercules, CA, USA). The specific amplification procedures were in accordance with the corresponding references (Table 2). The test was repeated for each sample three times.

Supplementary Materials

The following are available online at https://www.mdpi.com/article/10.3390/plants10112303/s1, Table S1: Analysis of variance (ANOVA) for stripe rust resistance and the estimated broad sense heritability, Table S2: An average coefficient of infection values (ACI) of the wheat germplasms carrying the stripe rust resistance genes (Almalybak, Almaty region, Kazakhstan, 2019 and 2020), Table S3: Mean daily temperature and relative humidity (Almalybak, Almaty region, Kazakhstan, 2019 and 2020), Figure S1: DNA amplification products of wheat entries using primers to the STS S19M93 locus linked with the Yr5 resistance gene, Figure S2: DNA amplification products of wheat entries using primers to the STS S23M41locus linked with the Yr5 resistance gene, Figure S3: DNA amplification products of wheat entries using primers to the STS-9/10 locus linked with the Yr5 resistance gene, Figure S4: DNA amplification products of wheat entries using primers to the SSR Xpsp3000 locus linked with the Yr10 resistance gene, Figure S5: DNA amplification products of wheat entries using primers to the Yr10SCAR locus linked with the Yr10 resistance gene, Figure S6: DNA amplification products of wheat entries using primers to the SSR Xbarc8 locus linked with the Yr15 resistance gene, Figure S7: DNA amplification products of wheat entries using primers to the SSR Xgwm413 locus linked with the Yr15 resistance gene, Figure S8: DNA amplification products of wheat entries using primers to the Ventriup/LN2 locus linked with the Yr17 resistance gene, Figure S9: DNA amplification products of wheat entries using primers to the STS csLV34 locus linked with the Yr18/Lr34 resistance gene.

Author Contributions

A.K. and A.R. conceived the manuscript and designed the research. A.K. and A.R. analyzed the data and wrote the manuscript. M.A., M.K., Z.K. and A.M. generated the phenotypic and genotyping data. All authors reviewed the manuscript. All authors have read and agreed to the published version of the manuscript.

Funding

This study was supported by the Ministry of Education and Science of the Republic of Kazakhstan under the program OR11465424 “Development and implementation of highly effective diagnostic systems for identifying the most dangerous diseases and increasing the genetic potential of crop resistance”, the task 03 “Development of DNA markers to create a system for identifying resistance genes based on mapping of loci of quantitative traits associated with yellow rust resistance in a population of recombinant wheat inbred lines”, for 2021–2022. The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Data are contained within the article and supplementary material.

Acknowledgments

Editing assistance from D. Murzabekov is appreciated.

Conflicts of Interest

Authors declare no conflict of interest.

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Table 1. Disease severity to stripe rust and presence of Yr genes in wheat genotypes from Kazakhstan.
Table 1. Disease severity to stripe rust and presence of Yr genes in wheat genotypes from Kazakhstan.
Cat
#
Cultivar/Line NameOrigin aYellow Rust Severity %, RT bMolecular Marker Test c
20192020S19M93S23M14STS
9/10
Yr10
SCAR
Xpsp
3000
Xbarc8Xgwm413csLV34VENTRIUP/LN2Yr Gene Detected Based on Linked Marker
1Naz/GF55-1KZ:Almaty-KIZ40S40MS000000000-
2Almaly/GF70KZ:Almaty-KIZ30MS20MS000000010Yr18
3425/GF55-1KZ:Almaty-KIZ20MS30MS000001110Yr15, Yr18
4Kupava/YR5/6/Avocet ‘S’KZ:Almaty-KIZ30MS20MS111000000Yr5
5Adir/YR2KZ:Almaty-KIZ10MR10MR000110000Yr10
6Sanzar8/BWKLDN9KZ:Almaty-KIZ50S40S000000000
7Viza/ZhenisKZ:Almaty-KIZ10MR10MR000110000Yr10
81777Darya/#72TungyshKZ:Almaty-KIZ30MS40MS000000000
9114Novosibirskaya-22/Omskaya37/28KZ:Almaty-KIZ10MR0111000011Yr5, Yr17, Yr18
101777Darya/Tungysh-1KZ:Almaty-KIZ30MS40MS000000000
111777Darya/Tungysh-2KZ:Almaty-KIZ00000000000
121777Darya/Tungysh-3KZ:Almaty-KIZ30S40S000000000
131777Darya/1724F1-1581/807F4/Naz/Umanka/
Almaly/ Zimorodok-1
KZ:Almaty-KIZ15R20MR111110010Yr5, Yr10, Yr18
141777Darya/1724F1-1581/807F4/Naz/Umanka/
Almaly/Zimorodok-2
KZ:Almaty-KIZ10MR0111000000Yr5
1512/1613MP-2011/1027/AVS/ Ulugbek600 /EgemenKZ:Almaty-KIZ00000000000
161017/103f3/N91/5353/Egemen-1KZ:Almaty-KIZ00000000000
171017/103f3/N91/5353/Egemen-2KZ:Almaty-KIZ50S40S000000000
181011/94f3/N23/Knyazhna/Naz-1KZ:Almaty-KIZ30MS40MS000000000
191011/94f3/N23/Knyazhna/Naz-2KZ:Almaty-KIZ20MS30MS000000000
201010/93f3/N23/Kupava/Mereke70-1KZ:Almaty-KIZ10MR10MR111000010Yr5, Yr18
211010/93f3/N23/Kupava/Mereke70-2KZ:Almaty-KIZ00000000000
22Rils Almaly/AnzaKZ:Almaty-KIZ15MS30MS000000000
235-ICARDA-IPBB-2013IWWIP-ICARDA-CIMMYT5R0000110000Yr10
245221/AlmalyKZ:Almaty-KIZ00000000000
25Naz/GF66/Ulugbek600-1KZ:Almaty-KIZ30S30MS000000000
26Naz/GF66/Ulugbek600-2KZ:Almaty-KIZ30S40MS000000000
27Naz/Immun78/MK3750KZ:Almaty-KIZ10R0000000000
28Almaly/YR4/NazKZ:Almaty-KIZ10MR0000110000Yr10
29RILS-F9 Almaly/Avoset ‘S’KZ:Almaty-KIZ10MR5MR000001100Yr15
30Naz/GF55-2KZ:Almaty-KIZ5R0000111100Yr10, Yr15
31Bogarnaya56/5515/K-47100-RomaniaKZ:Almaty-KIZ70S90S000000000
32Taza/MK 3750-1KZ:Almaty-KIZ20MR10MR000110000Yr10
33Taza/MK 3750-2KZ:Almaty-KIZ5MR10MR111110000Yr5, Yr10
34Naz/GF55-3KZ:Almaty-KIZ20MS10MS111110000Yr5, Yr10
35Almaly/GF92KZ:Almaty-KIZ30S40MS000000010Yr18
36428/MK-122AKZ:Almaty-KIZ10MR10MS000110000Yr10
37Naz/GF55-4KZ:Almaty-KIZ20MR20MS000110000Yr10
38425/RenanKZ:Almaty-KIZ30MS50MS000100001Yr17
39425/GF55-2KZ:Almaty-KIZ20MS20MR000110000Yr10
40Almaly/GF70/2KZ:Almaty-KIZ30MS20MS000001100Yr15
41#23/Kupava-5KZ:Almaty-KIZ10R0000001100Yr15
42#23/Kupava-7KZ:Almaty-KIZ00000111100Yr10, Yr15
43#23/Kupava-10KZ:Almaty-KIZ30S30MS000000000
44#23/Kupava-12KZ:Almaty-KIZ5R0111000000Yr5
45#23/Kupava-16KZ:Almaty-KIZ10MR0000110000Yr10
46#23/Kupava-24KZ:Almaty-KIZ5R0111110000Yr5, Yr10
471010/93/#23/Kupava/
Mereke/Naz
KZ:Almaty-KIZ001011+000000Yr10yr10
48807-2011/Babax1/907/Almaly 29266/Sultan2KZ:Almaty-KIZ30MS10MS0001+000000Yr10yr10
49Almaly/YR18KZ:Almaty-KIZ10R00001+000000Yr10yr10
501596-2#23/Kupava/
Ulugbek/YR4/Mereke/T.Spelta-YR5-1
KZ:Almaty-KIZ5R10MR100001+0000Yr15yr15
511596-3#23/Kupava/
Ulugbek/YR4/Mereke /T. Spelta-YR5-1
KZ:Almaty-KIZ10MR20MR1001+000000Yr10yr10
52AdirKG20MR10MR000110000Yr10
53KeremetKZ: KIZ5R10MR000001100Yr15
54KarasayKZ: KIZ10R15MR000110010Yr10, Yr18
55UmankaRU40MS30MS000000000
56KyzylbidayKZ: KIZ40MS30S000000000
57Sanzar8UZ70S50S000000000
58Mereke70KZ: KIZ20MR10MR111110010Yr5, Yr10, Yr18
59Yuzhnaya12KZ: KIZ50S40S000000000
60MatayKZ: KIZ20MS20MR000110000Yr10
61NazKZ: KIZ10MR20MR000110000Yr10
62NurekeKZ: KIZ20MR10MR000000010Yr18
63DinaraKZ:Almaty-KIZ10MR20MR111000000Yr5
64KupavaRU20MS30MS000000010Yr18
65Sultan2KZ: KIZ10MR5MR000110000Yr10
66TungyshKZ: KIZ5MR10R111000000Yr5
67TazaKZ: KIZ15MR20MR111000000Yr5
68IntensivnayaKZ: KIZ10MS20MR000110000Yr10
69ZimorodokRU10MR20MS111000000Yr5
70AlmalyKZ: KIZ20MR20MS000000010Yr18
71MoroccoMAROCCO80S90S000000000-
71Avocet S*6/Yr5AUSTRALIA5R0111000000Yr5
72Avocet S*6/Yr10AUSTRALIAR10R000110000Yr10
73Avocet S*6/Yr15AUSTRALIA5R0000001100Yr15
74YR17/LR37/NIL-LR37/TC-6/VPM-RL6081AUSTRALIA10MS25MS000000001Yr17
75YR18/NIL-LR34/TC-6/PI58548AUSTRALIA10MR10MS000000010Yr18
76Avocet SAUSTRALIA90S90S000000000-
a—Origin includes countries and organizations: ICARDA—CAC (IWWP), KZ—Kazakhstan, KG–Kyrgyzstan, RU–Russia, KIZ–Kazakh Research Institute of Agriculture and Crop Production, Almaty–Institute of Plant Biology and Biotechnology. b—Values indicate severity, RT—reaction type. c—“1”, “0”, “1 + 0” and “-” indicate the presence, absence and heterozygote allele of corresponding gene, respectively.
Table 2. Specific primer sequences, PCR annealing temperature, expected size and references for selected Yr-genes.
Table 2. Specific primer sequences, PCR annealing temperature, expected size and references for selected Yr-genes.
GeneMarker TypePrimer NamePrimer Sequence (5′-3′)Annealing Temp. (°C)Fragment Size (bp)Reference
Yr5STSS19M93TAATTGGGACCGAGAGACG
TTCTTGCAGCTCCAAAACCT
62100[50]
Yr5STSS23M41TCAACGGAACCTCCAATTTC AGGTAGGTGTTCCAGCTTGC58275[50]
Yr5STSYr5STS-9/10AAA GAA TAC TTT AAT GAA3
CAA ACT TAT CAG GAT TAC3
60+289
−182
[51]
Yr10SSRXpsp3000GCAGACCTGTGTCATTGGTC GATATAGTGGCAGCAGCAGGATAC55+260
−240
[32]
Yr10SCARYr10SCARCTG CAG AGT GAC ATC ATA CA
TCG AAC TAG TAG ATG CTG GC
55200
+180
[53]
Yr15SSRXbarc8GCG GGA ATC ATG CAT AGG AAA ACA GAA
GCG GGG GCG AAA CAT ACA CAT AAA AAC A
60+250
−280
[83]
Yr15SSRXgwm413TGCTTGTCTAGATTGCTTGGG
GATCGTCTCGTCCTTGGCA
6096[55]
Yr17/Lr37/Sr38SCARVENTRIUP/LN2AGG GGC TAC TGA CCA AGG CT
TGC AGC TAC AGC AGT ATG TAC ACA AAA
65262[57]
Yr18/Lr34STScsLV34GTT GGT TAA GAC TGG TGA TGG
TGC TTG CTA TTG CTG AAT AGT
60+150
−229
[47]
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Kokhmetova, A.; Rsaliyev, A.; Malysheva, A.; Atishova, M.; Kumarbayeva, M.; Keishilov, Z. Identification of Stripe Rust Resistance Genes in Common Wheat Cultivars and Breeding Lines from Kazakhstan. Plants 2021, 10, 2303. https://doi.org/10.3390/plants10112303

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Kokhmetova A, Rsaliyev A, Malysheva A, Atishova M, Kumarbayeva M, Keishilov Z. Identification of Stripe Rust Resistance Genes in Common Wheat Cultivars and Breeding Lines from Kazakhstan. Plants. 2021; 10(11):2303. https://doi.org/10.3390/plants10112303

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Kokhmetova, Alma, Aralbek Rsaliyev, Angelina Malysheva, Makpal Atishova, Madina Kumarbayeva, and Zhenis Keishilov. 2021. "Identification of Stripe Rust Resistance Genes in Common Wheat Cultivars and Breeding Lines from Kazakhstan" Plants 10, no. 11: 2303. https://doi.org/10.3390/plants10112303

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