Abstract
Key message
A total of 282 mungbean accessions were resequenced to identify genome-wide variants and construct a highly precise variant map, and drought tolerance-related loci and superior alleles were identified by GWAS.
Abstract
Mungbean (Vigna radiata (L.) R. Wilczek) is an important food legume crop that is highly adapted to drought environments, but severe drought significantly curtails mungbean production. Here, we resequenced 282 mungbean accessions to identify genome-wide variants and constructed a highly precise map of mungbean variants. A genome-wide association study was performed to identify genomic regions for 14 drought tolerance-related traits in plants grown under stress and well-watered conditions over three years. One hundred forty-six SNPs associated with drought tolerance were detected, and 26 candidate loci associated with more than two traits were subsequently selected. Two hundred fifteen candidate genes were identified at these loci, including eleven transcription factor genes, seven protein kinase genes and other protein coding genes that may respond to drought stress. Furthermore, we identified superior alleles that were associated with drought tolerance and positively selected during the breeding process. These results provide valuable genomic resources for molecular breeding and will accelerate future efforts aimed at mungbean improvement.
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Data availability
Data supporting the current study can be obtained by contacting the corresponding author (wujing@ caas.cn).
Abbreviations
- QTL:
-
Quantitative trait locus
- RIL:
-
Recombinant inbred line
- GWAS:
-
Genome-wide association study
- WGRS:
-
High-quality whole-genome resequencing
- SNP:
-
Single-nucleotide polymorphism
- InDeL:
-
Insertions or deletion
- PCA:
-
Principal-component analyses
- LD:
-
Linkage disequilibrium
- BLUP:
-
Best linear unbiased predictions
- DC:
-
Drought tolerance coefficient
- DI:
-
Drought tolerance index
- CV :
-
Coefficient of variation
- HSW:
-
100-Seed weight
- PLY:
-
Plot yield
- PH:
-
Plant height
- NB:
-
Number of branches
- NMS:
-
Node number of the main stem
- PNP:
-
Number of pods per plant
- PL:
-
Pod length
- NSP:
-
Number of seeds per pod
- NS:
-
Number of seeds per plant
- DGP:
-
Days of growth period
- DTF:
-
Days to flowering
- DTP:
-
Days to pod initiation
- YP:
-
Yield per plant
- BP:
-
Biomass per plant
- MLM:
-
Mixed linear model
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Funding
This work was provided by National Key R&D Program of China (2019YFD1001300, 2019YFD1001305), China Agriculture Research System of MOF and MARA-Food Legumes (CARS-08), the Agricultural Science and Technology Innovation Program of CAAS.
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LW and JW designed and supervised the research. LW, LP and LJ performed the phenotypic experiments. YC analysed data. YC wrote the paper. JW and SW reviewed the paper. All authors have read and approved the manuscript.
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Chang, Y., Peng, L., Ji, L. et al. Genome-wise association study identified genomic regions associated with drought tolerance in mungbean (Vigna radiata (L.) R. Wilczek). Theor Appl Genet 136, 40 (2023). https://doi.org/10.1007/s00122-023-04303-3
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DOI: https://doi.org/10.1007/s00122-023-04303-3