Ecology, Evolution, Genomics, Molecular Interactions and Agricultural Application of Legume and Rhizobium Symbionts

A special issue of Plants (ISSN 2223-7747). This special issue belongs to the section "Plant Protection and Biotic Interactions".

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 2713

Special Issue Editors


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Guest Editor
College of Biological Science, China Agricultural University, Beijing 100193, China
Interests: legumes; molecular microbial ecology; biological nitrogen fixation; symbiosis; genetic diversity

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Guest Editor
Laboratory of Plant Nutrition, Department of Crop Production, Faculty of Agricultural Sciences, University of Talca, Talca, Chile
Interests: plant nutrition; biological nitrogen fixation; legumes; phosphorus nutrition; rhizosphere processes; transcriptomics

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Guest Editor
Lithuanian Research Centre for Agriculture and Forestry, Kedainiai, Lithuania
Interests: legume’s productivity, usage, cultivar potential and introduction of new species under the climate change; nitrogen fixation and symbiosis of microorganisms with plants; the use of organic farming technologies and organic fertilizers; soil biodiversity in an organic agroecosyste

Special Issue Information

Dear Colleagues,

The symbiotic nitrogen fixation between rhizobium and legume is beneficial to agriculture, food and ecology as it provides high quality protein, oil and forage grass to humans, animals and soil. Exploring the relationship between them will help us to understand and exploit them more efficiently. However, many aspects related to this issue need to be studied in greater depth. This Special Issue of Plants will highlight the ecology, evolution, genomics, molecular interactions and agricultural application of legume and rhizobium symbionts.

Dr. Wenfeng Chen
Dr. Ricardo A. Cabeza
Dr. Monika Toleikienė
Guest Editors

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Keywords

  • rhizobia
  • legume
  • biological nitrogen fixation
  • symbiosis
  • ecology
  • molecular interactions
  • agriculture
  • diversity
  • genome
  • legume–rhizobium interactions

Published Papers (2 papers)

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Research

18 pages, 3243 KiB  
Article
The Effect of Different Rhizobial Symbionts on the Composition and Diversity of Rhizosphere Microorganisms of Chickpea in Different Soils
by Junjie Zhang, Nan Wang, Shuo Li, Jingqi Wang, Yufeng Feng, Entao Wang, Youguo Li, Tao Yang and Wenfeng Chen
Plants 2023, 12(19), 3421; https://doi.org/10.3390/plants12193421 - 28 Sep 2023
Cited by 1 | Viewed by 1047
Abstract
Background: Chickpea (Cicer arietinum L.) is currently the third most important legume crop in the world. It could form root nodules with its symbiotic rhizobia in soils and perform bio-nitrogen fixation. Mesorhizobium ciceri is a prevalent species in the world, except China, [...] Read more.
Background: Chickpea (Cicer arietinum L.) is currently the third most important legume crop in the world. It could form root nodules with its symbiotic rhizobia in soils and perform bio-nitrogen fixation. Mesorhizobium ciceri is a prevalent species in the world, except China, where Mesorhizobium muleiense is the main species associated with chickpea. There were significant differences in the competitive ability between M. ciceri and M. muleiense in sterilized and unsterilized soils collected from Xinjiang, China, where chickpea has been grown long term. In unsterilized soils, M. muleiense was more competitive than M. ciceri, while in sterilized soils, the opposite was the case. In addition, the competitive ability of M. ciceri in soils of new areas of chickpea cultivation was significantly higher than that of M. muleiense. It was speculated that there might be some biological factors in Xinjiang soils of China that could differentially affect the competitive nodulation of these two chickpea rhizobia. To address this question, we compared the composition and diversity of microorganisms in the rhizosphere of chickpea inoculated separately with the above two rhizobial species in soils from old and new chickpea-producing regions. Results: Chickpea rhizosphere microbial diversity and composition varied in different areas and were affected significantly due to rhizobial inoculation. In general, eight dominant phyla with 34 dominant genera and 10 dominant phyla with 47 dominant genera were detected in the rhizosphere of chickpea grown in soils of Xinjiang and of the new zones, respectively, with the inoculated rhizobia. Proteobacteria and Actinobacteria were dominant at the phylum level in the rhizosphere of all soils. Pseudomonas appeared significantly enriched after inoculation with M. muleiense in soils from Xinjiang, a phenomenon not found in the new areas of chickpea cultivation, demonstrating that Pseudomonas might be the key biological factor affecting the competitive colonization of M. muleiense and M. ciceri there. Conclusions: Different chickpea rhizobial inoculations of M. muleiense and M. ciceri affected the rhizosphere microbial composition in different sampling soils from different chickpea planting areas. Through high throughput sequencing and statistical analysis, it could be found that Pseudomonas might be the key microorganism influencing the competitive nodulation of different chickpea rhizobia in different soils, as it is the dominant non-rhizobia community in Xinjiang rhizosphere soils, but not in other areas. Full article
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16 pages, 4855 KiB  
Article
Exogenous Selenium and Biochar Application Modulate the Growth and Selenium Uptake of Medicinal Legume Astragalus Species
by Shengjun Ma, Guangwei Zhu, Rozi Parhat, Yuanyuan Jin, Xueshuang Wang, Wenping Wu, Wanli Xu, Yanling Wang and Wenfeng Chen
Plants 2023, 12(10), 1957; https://doi.org/10.3390/plants12101957 - 11 May 2023
Cited by 2 | Viewed by 1163
Abstract
Astragalus species have a certain capacity to enrich selenium (Se) and are the strongest Se hyperaccumulator legumes known globally at present. The biochar application to medicinal plants has been reported to affect plant metabolites. In this study, we aimed to employ hyperaccumulating Astragalus [...] Read more.
Astragalus species have a certain capacity to enrich selenium (Se) and are the strongest Se hyperaccumulator legumes known globally at present. The biochar application to medicinal plants has been reported to affect plant metabolites. In this study, we aimed to employ hyperaccumulating Astragalus species in the plant growth of selenium-lacked soil, while also investigating the impact of varying selenium doses and biochar application on legumes growth, selenium content, and secondary metabolite production. Applying biochar to soil, along with a Se concentration of 6 mg/kg, significantly enhanced the growth, Se content, total polysaccharide content, and calycosin-7-glucoside content of Astragalus species (p < 0.05). Importantly, the Se and biochar application also led to a significant improvement in Se content in ABH roots (p < 0.05). Meanwhile, the content of total flavonoids in ABH roots could be promoted by a Se concentration of 3 mg/kg and biochar application in soil. Additionally, the Se enrichment coefficients of Astragalus species under Se treatments were significantly higher than those under control treatment, with a marked difference observed across all treatments, whether roots or above-ground (p < 0.05). Remarkably, the Se transport coefficients of Astragalus species were observed to be lower than one, except for the transport coefficient of AB in the Se concentration of the control treatment (0 mg/kg). This result showed that a medium concentration treatment of Se and biochar application in soil not only promotes the growth of Astragalus species and the uptake of exogenous Se but also increases the active component content, meanwhile enhancing the Se enrichment and transport capacity. Taken as a whole, the present findings offer a more comprehensive understanding of the interplay between distinct Se levels, as well as the addition of biochar in soil, providing valuable insight for the cultivation of Se-rich Astragalus in Se-deficient soil-plant systems. Full article
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