Min, H and Wang, K and Wang, T and Cheng, X and Habyarimana, E and Wang, Y and Hu, D and Wang, Y-H and Wang, L (2025) Association mapping and candidate gene identification for drought tolerance in sorghum. Frontiers in Plant Science (TSI), 16. ISSN 1664-462X
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Water is essential for plant growth and drought is one of the most predominant constraints on crop yield. Sorghum is a well-known drought tolerant crop model and sorghum landraces possess novel alleles for local adaptation. In this study, we evaluated the sorghum mini core panel of 239 globally sampled landraces for shoot and root growth under drought conditions simulated by 10%/20% polyethylene glycol (PEG) in 2020 and 2024 and measured drought tolerance by Seedling Tolerance Coefficient (STC). Phenotypic analysis showed that more accessions produced more roots than longer roots when exposed to 10% PEG, but at 20% PEG, more accessions produced longer roots than more roots, reflecting the adaptability of some accessions to drought stress. However, PEG reduced shoot growth in all accessions in both years. Genomewide association study (GWAS) on 33 32 growth and 19 STC traits identified 22 loci, 19 of which were mapped to the STC traits and 17 of the 19 to STC of shoot weight. Eleven of the 22 loci are were colocated with 23 previously mapped drought related QTLs; 15 of these 23 QTLs were either mapped to green leaf area, total number of green leaves or chlorophyll content. We also found 19 candidate genes for 12 of the 22 loci. Five of those genes show either preferential or specific expression in the roots according to GeneAtlas v2. One candidate gene from a locus colocated with a previously mapped chlorophyll fluorescence QTL has been shown to increase chlorophyll fluorescence in maize in another study. Based on the response of root length and dry weight, we identified IS 30533 as the most tolerant and IS 32439 as the most sensitive accession. Results from this study lays foundation to further characterize the sorghum mini core panel for novel drought tolerance genes.
| Item Type: | Article |
|---|---|
| Divisions: | Global Research Program - Accelerated Crop Improvement |
| CRP: | UNSPECIFIED |
| Uncontrolled Keywords: | Sorghum, mini core, GWAS, snps, drought tolerance, candidate genes |
| Subjects: | Others > Drought Tolerance Mandate crops > Sorghum |
| Depositing User: | Mr Nagaraju T |
| Date Deposited: | 18 Jul 2025 08:01 |
| Last Modified: | 18 Jul 2025 08:01 |
| URI: | http://oar.icrisat.org/id/eprint/13225 |
| Official URL: | https://www.frontiersin.org/journals/plant-science... |
| Projects: | UNSPECIFIED |
| Funders: | UNSPECIFIED |
| Acknowledgement: | UNSPECIFIED |
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