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
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Abstract
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.
| Item Type: | Article |
|---|---|
| Divisions: | Research Program : West & Central Africa |
| CRP: | UNSPECIFIED |
| Uncontrolled Keywords: | abiotic stress, adaptation, crop, QTL mapping, transpiration |
| Subjects: | Others > Abiotic Stress Mandate crops > Sorghum |
| Depositing User: | Mr Nagaraju T |
| Date Deposited: | 17 Jan 2024 06:25 |
| Last Modified: | 17 Jan 2024 06:25 |
| URI: | http://oar.icrisat.org/id/eprint/12374 |
| Official URL: | https://onlinelibrary.wiley.com/doi/full/10.1002/p... |
| Projects: | UNSPECIFIED |
| Funders: | UNSPECIFIED |
| Acknowledgement: | This paper is made possible by the support of the American People provided to the Feed the Future Innovation Lab for Collaborative Research on Sorghum and Millet through the United States Agency for International Development (USAID) under Cooperative Agreement No. AID-OAA-A-13-00047. The contents are the sole responsibility of the authors and do not necessarily reflect the views of USAID or the United States Government. We are grateful to the physiology lab technicians at ICRISAT Sadoré in Niger. |
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