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Genome-wide association studies identify putative pleiotropic locus mediating drought tolerance in sorghum

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Relation http://oar.icrisat.org/12374/
https://onlinelibrary.wiley.com/doi/full/10.1002/pld3.413
https://doi.org/10.1002/pld3.413
 
Title Genome-wide association studies identify putative pleiotropic locus mediating drought tolerance in sorghum
 
Creator Maina, F
Harou, A
Hamidou, F
Morris, G P
 
Subject Abiotic Stress
Sorghum
 
Description Drought is a key constraint on plant productivity and threat to food security. Sor-ghum (Sorghum bicolorL. Moench), a global staple food and forage crop, is among themost drought-adapted cereal crops, but its adaptation is not yet well understood.This study aims to better understand the genetic basis of preflowering drought insorghum and identify loci underlying variation in water use and yield componentsunder drought. A panel of 219 diverse sorghum from West Africa was phenotypedfor yield components and water use in an outdoor large-tube lysimeter system underwell-watered (WW) versus a preflowering drought water-stressed (WS) treatment.The experimental system was validated based on characteristic drought response ininternational drought tolerant check genotypes and genome-wide association studies(GWAS) that mapped the major height locus atQHT7.1andDw3. GWAS furtheridentified marker trait associations (MTAs) for drought-related traits (plant height,flowering time, forage biomass, grain weight, water use) that each explained 7–70%of phenotypic variance. Most MTAs for drought-related traits correspond to loci notpreviously reported, but some MTA for forage biomass and grain weight under WSco-localized with staygreen post-flowering drought tolerance loci (Stg3aandStg4). Aglobally common allele at S7_50055849 is associated with several yield componentsunder drought, suggesting that it tags a major pleiotropic variant controlling assimi-late partitioning to grain versus vegetative biomass. The GWAS revealed oligogenicvariants for drought tolerance in sorghum landraces, which could be used as trait pre-dictive markers for improved drought adaptation.
 
Publisher American Society of Plant Biologists and the Society for Experimental Biology and John Wiley & Sons Ltd.
 
Date 2022-06-16
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights cc_attribution
 
Identifier http://oar.icrisat.org/12374/1/Plant%20Direct_6_6_1-16_2022.pdf
Maina, F and Harou, A and Hamidou, F and Morris, G P (2022) Genome-wide association studies identify putative pleiotropic locus mediating drought tolerance in sorghum. Plant Direct, 6 (6). pp. 1-16. ISSN 2475-4455