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Horticulturae
Special Issues
Germplasm Resources and Genetic Breeding of Ornamental Plants
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Germplasm Resources and Genetic Breeding of Ornamental Plants

A special issue of Horticulturae (ISSN 2311-7524). This special issue belongs to the section "Genetics, Genomics, Breeding, and Biotechnology (G2B2)".

Deadline for manuscript submissions: 15 May 2024 | Viewed by 5952

Special Issue Editors

Dr. Xiaojing Liu

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Guest Editor
Jiangsu Engineering Research Center of Aquatic Plant Resources and Water Environment Remediation, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China
Interests: ornamental plants; genetic breeding; breeding of new varieties
Dr. Daofeng Liu

E-Mail Website
Guest Editor
Chongqing Engineering Research Center for Floriculture, Key Laboratory of Horticulture Science for Southern Mountainous Regions of Ministry of Education, College of Horticulture and Landscape Architecture, Southwest University, Chongqing 400715, China
Interests: ornamental plants; landscape plants; genetic breeding; biotechnology
Dr. Wen Chen

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Guest Editor
College of Horticulture Science, Zhejiang A&F University, Hangzhou 311300, China
Interests: ornamental plants; plant physiology; genetic breeding; biotechnology
Dr. Jing Ma

E-Mail Website
Guest Editor
Chongqing Engineering Research Center for Floriculture, Key Laboratory of Horticulture Science for Southern Mountainous Regions of Ministry of Education, College of Horticulture and Landscape Architecture, Southwest University, Chongqing 400715, China
Interests: ornamental plants; landscape plants; biotechnology

Special Issue Information

Dear Colleagues,

Ornamental plants include landscape trees, flowers, and other ground cover. The germplasm generally have beautiful flowers fruits or leaves, or attractive shapes. For high ornamental value,the study usually focused on the conservation and utilization of germplasm resources, analysis of genetic mechanism, mining of functional genes, and breeding of new varieties with excellent traits.

The scope of this Special Issue includes a series of contents, such as planting resources and application of ornamental plants, genetics and breeding of ornamental plants, cultivation technology and promotion and application, etc. This Special Issue focuses on genetic traits related to flower color, floral fragrance, stress resistance, and genetic mechanism of the characteristic ornamental plants by means of modern biotechnology, and then improve and cultivate new varieties. This Special Issue also encourages the practical problems existing in the production of germplasm of ornamental plants,the theoretical research and discussion on the physiological mechanism and molecular mechanism.

Dr. Xiaojing Liu
Dr. Daofeng Liu
Dr. Wen Chen
Dr. Jing Ma
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Horticulturae is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • ornamental plants
  • germplasm
  • molecular mechanism
  • genetic breeding

Published Papers (4 papers)

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Research

18 pages, 12986 KiB  
Article
Genome-Wide Analysis of the SWEET Transporters and Their Potential Role in Response to Cold Stress in Rosa rugosa
by Ronghui Li, Peng Gao, Tao Yang, Jie Dong, Yunting Chen, Yangyang Xie, Yvtong Yang, Chengzhi Liu, Jinzhu Zhang and Daidi Che
Horticulturae 2023, 9(11), 1212; https://doi.org/10.3390/horticulturae9111212 - 08 Nov 2023
Viewed by 989
Abstract
Sugar Will Eventually be Exported Transporter (SWEET) proteins are a recently discovered group of efflux transporters that play essential roles in sugar efflux, phloem loading, reproductive tissue development and stress responses. To date, there have been no reports on the Rosa rugosa ( [...] Read more.
Sugar Will Eventually be Exported Transporter (SWEET) proteins are a recently discovered group of efflux transporters that play essential roles in sugar efflux, phloem loading, reproductive tissue development and stress responses. To date, there have been no reports on the Rosa rugosa (R. rugosa) SWEET genes. In this study, we conducted a comprehensive genomic analysis of the SWEET genes, including chromosome localization, phylogenetic comparison, cis-regulatory element analysis, expression pattern analysis in different tissues, expression pattern analysis under cold stress and subcellular localization analysis. A total of 33RrSWEET members were identified and classified into four distinct clades (Clade I, Clade II, Clade III and Clade IV). They were distributed across seven chromosomes and contained cis-regulatory elements associated with hormone and stress responses. The expression of RrSWEETs showed tissue specificity, with higher expression in roots, flowers or pistils compared to other tissues. Furthermore, during the entire cold stress process, the relative expression levels of RrSWEET4, 16 and 20 were significantly upregulated, especially in the roots and stems of R. rugosa. Subcellular localization analysis revealed that RrSWEET4, 16 and 20 were located on the cell membrane. In summary, the results of this study provide a theoretical basis for future research on the functions of RrSWEET genes in R. rugosa and their role in cold tolerance responses. Full article
(This article belongs to the Special Issue Germplasm Resources and Genetic Breeding of Ornamental Plants)
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15 pages, 3530 KiB  
Article
Molecular Variation in Some Taxa of Genus Astragalus L. (Fabaceae) in the Iraqi Kurdistan Region
by Lanja Hewa Khal, Nawroz Abdul-razzak Tahir and Rupak Tofiq Abdul-Razaq
Horticulturae 2023, 9(10), 1110; https://doi.org/10.3390/horticulturae9101110 - 08 Oct 2023
Viewed by 1065
Abstract
Astragalus L. is one of the main genera of blossoming plants, and its diversity of species and forms is well known. The Astragalus L. taxa make a significant contribution to the mountainous and steppe ecosystems of the Kurdistan region of Iraq. Although the [...] Read more.
Astragalus L. is one of the main genera of blossoming plants, and its diversity of species and forms is well known. The Astragalus L. taxa make a significant contribution to the mountainous and steppe ecosystems of the Kurdistan region of Iraq. Although the species within this genus have been the subject of several molecular studies, the evolutionary relationships among these species remain unidentified. Despite extensive research, little is known about the phylogenetic relationships among the various subgenera of Astragalus. This research is intended to investigate the molecular variation of 33 species of the genus Astragalus L. found in the Kurdistan area of Iraq. For molecular validations, three separate techniques (nuclear ribosomal DNA (rDNA), inter simple sequence repeats (ISSR), and conserved DNA-derived polymorphism (CDDP)) were used. With respect to Astragalus L. indentations, universal ITS1 and ITS4 gene sequencing was used, and the discovered sequences were subjected to BLAST searches in the NCBI database. A phylogenetic tree was generated with two main clades. Regarding detecting genetic diversity between the taxa, 24 molecular markers (14 ISSR and 10 CDDP) were used. High values of polymorphic materials and gene diversity were detected. ISSR markers had an average of 22.71 polymorphic bands per primer, while CDDP markers had the highest mean values for polymorphic information content (0.37), Shannon’s information index (0.27), expected heterozygosity (0.19), and unbiased expected heterozygosity (0.23). Cluster and principal coordinate analyses divided the Astragalus L. taxa into four main groups using the two molecular data sets. According to the results of the molecular variance analysis, the highest variation was detected within sections, with values of 92.01 and 89.48% for ISSR and CDDP markers, respectively. These outcomes suggest the effectiveness of molecular markers and the ITS region in determining and identifying genetic correlations between Astragalus species. Full article
(This article belongs to the Special Issue Germplasm Resources and Genetic Breeding of Ornamental Plants)
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12 pages, 2912 KiB  
Article
Assessment of Genetic Diversity in the White-Colored Variants of Spray-Type Chrysanthemum Cultivars Using SSR Markers
by Manjulatha Mekapogu, Hyun-Young Song, So-Hyeon Lim and Jae-A Jung
Horticulturae 2023, 9(7), 798; https://doi.org/10.3390/horticulturae9070798 - 12 Jul 2023
Cited by 1 | Viewed by 1090
Abstract
Chrysanthemums represent the second most important cut flower after rose on the global commercial market. The phenomenal importance and global popularity of chrysanthemums have attracted breeders’ attention, resulting in the release of vast numbers of cultivars. Identifying these cultivars is crucial to protecting [...] Read more.
Chrysanthemums represent the second most important cut flower after rose on the global commercial market. The phenomenal importance and global popularity of chrysanthemums have attracted breeders’ attention, resulting in the release of vast numbers of cultivars. Identifying these cultivars is crucial to protecting breeders’ intellectual property rights and improving the efficiency of breeding. Distinguishing chrysanthemum genotypes based on their morphological characteristics is challenging as they vary highly within this group, hence requiring the use of efficient molecular markers. In this study, we evaluated the genetic diversity of 57 spray-type chrysanthemum cultivars bearing white, ivory, and cream-colored flowers. A total of six loci were evaluated regarding their polymorphism efficiency across the tested cultivars. Allele numbers ranged from 2 to 6, with a mean of 3.5 alleles per locus. The average polymorphism information content (PIC) was 0.53 for six SSR markers. Cluster analysis of genetic relationships using the UPGMA method showed a genetic distance of 0.31 to 1.00, and the 57 white variants of chrysanthemum cultivars were characterized using the tested SSR markers. However, two sets of cultivars, namely, Pure Angel–Neba and Ladost–White wing, exhibited total genetic similarity and hence could not be discriminated. These results provide efficient SSR markers that can be used to identify chrysanthemum cultivars (and assess their genetic relationships) that cannot be discriminated based on phenotype. Full article
(This article belongs to the Special Issue Germplasm Resources and Genetic Breeding of Ornamental Plants)
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11 pages, 2265 KiB  
Article
Morpho-Physiological and Transcriptional Regulation of Root System under Saline Conditions in Nymphaea Plants
by Shaozhou Chen, Fengfeng Du, Qianhao Huang, Xiaojing Gao, Zhiyuan Zhang, Jian Cui, Yajun Chang, Xiaojing Liu and Dongrui Yao
Horticulturae 2023, 9(2), 132; https://doi.org/10.3390/horticulturae9020132 - 19 Jan 2023
Cited by 1 | Viewed by 1592
Abstract
Water lilies (Nymphaea L.) are ancient angiosperms that can be cultivated in both fresh and brackish water. Water lily plants have adapted morphologically and physiologically to the aqueous environment. Nonetheless, little is known about the regulatory mechanisms that enable water lily to [...] Read more.
Water lilies (Nymphaea L.) are ancient angiosperms that can be cultivated in both fresh and brackish water. Water lily plants have adapted morphologically and physiologically to the aqueous environment. Nonetheless, little is known about the regulatory mechanisms that enable water lily to acclimate to saline conditions, restricting its production and distribution. To illustrate the role of roots in water lily salinity tolerance, we investigated the adaptive regulation of the water lily root system under high salinity. Aspects of its root architecture, including root length, surface area, volume, and tip number, were significantly reduced by salt stress. Transcriptome sequencing showed that 120 genes were upregulated and 1214 genes were downregulated under salt stress. The differentially expressed genes were mainly enriched in oxidoreductase activity, structural molecule activity, and transmembrane transporter activity. Most ion transporter genes were downregulated, suggesting that water lily may partially close ion channels and/or transporters to avoid excessive ion accumulation or ion imbalance under long-term salt stress. Genes related to NO3− transport were both up- and downregulated, whereas genes related to ammonium transport were uniformly downregulated, suggesting that transcriptional changes may play a role in balancing nitrogen metabolism under long-term saline conditions. The roots showed relatively high concentrations of Na+ and had the ability to hyper-accumulate Na+ under salt stress. These findings provide insight into the regulatory mechanisms that enable water lily roots to tolerate salinity and lay a foundation for the breeding of salt-tolerant cultivars. Full article
(This article belongs to the Special Issue Germplasm Resources and Genetic Breeding of Ornamental Plants)
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