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| Content Provider | frontiers |
|---|---|
| Author | Ahmed, Hafiz Ghulam Muhu-Din Zeng, Yawen Khan, Muhammad Ahsan Rashid, Muhammad Abdul Rehman Ameen, Muhammad Akrem, Ahmed Saeed, Amjad |
| Description | Depleting water resources and increasing global temperature due to climate change are major challenges to agriculture and food security worldwide. Deciphering the underlying mechanisms of traits contributing to grain development and yield is essential for the development of climate-resilient cultivars. Therefore, this study assessed 105 bread wheat genotypes grown under control, drought, and heat-stress conditions for two crop seasons and performed a genome-wide association study (GWAS) using a 90k SNP array. The genotypes showed significant trait differences under all environmental conditions. Highly significant variation was observed, with moderate (50.09%) to high (76.19%) heritability in the studied germplasms. The studied traits were all also significantly positively correlated. A total of 541 significant associations (p ≤ 10−3) between marker and trait (MTAs) were observed after crossing the FDR <0.05 threshold for all traits. Among these, 195, 179, and 167 significant MTAs were detected under control, drought, and heat-stress conditions, respectively. Under the control and drought conditions, pleiotropic loci BS00010616_51 and BS00010868_51 were observed on chromosomes 7B and 1B situated at 186.24 cM and 35.47 cM, respectively. Pleiotropic loci BS00010868_51, Kukri_c11154_1723, and Ex_c10068_1509 were identified on chromosomes 1B, 5B, and 2A, respectively, under control and heat stress conditions. A stable and consistent locus (Excalibur_c20796_395) on chromosome 7A... |
| Abstract | The depleting water resources and rise in global temperature due to climate change are the major challenges to agriculture and food security worldwide. Deciphering the underlying mechanisms of grain development and yield contributing traits are essential to develop climate resilient cultivars. Therefore, 105 bread wheat genotypes were assessed for a genome-wide association study (GWAS) using a 90k SNPs arrays, which was grown under control, drought, and heat stressed conditions for two crop seasons. The genotypes exhibited significant differences for traits under all environmental conditions. Highly significant variation was observed, with moderate (50.09%) to high (76.19%) heritability in the studied germplasm. A significant positive correlation existed among all studied traits. A total of 541 significant associations between marker and trait (MTAs) were found at P ≤ 10-3 after crossing FDR < 0.05 threshold for all traits. Out of these, 195, 179 and 167 significant MTAs were detected under control, drought, and heat-stressed conditions, respectively. Under control and drought conditions, the pleiotropic loci were observed as BS00010616_51 and BS00010868_51 on chromosomes 7B and 1B situated at 186.24cM 35.47cM, respectively. The pleiotropic locus (BS00010868_51, Kukri_c11154_1723, and Ex_c10068_1509) were identified on chromosomes 1B, 5B, and 2A, respectively, under control and heat stress. A stable and consistent locus (Excalibur_c20796_395) at chromosome 7A, located at 372.34cM, was also linked with grain morphology and yield-related attributes in control, drought, and heat-stressed conditions. The current investigation confirmed several previously reported MTAs for the traits under consideration and discovered new MTAs under harsh climatic circumstances. Identified SNPs will aid in the discovery of novel genes in wheat. Significantly associated SNPs would be utilized in marker-assisted selection and allowing for the development of drought and heat-tolerant genotypes with high yield to address global food security concerns |
| ISSN | 16648021 |
| DOI | 10.3389/fgene.2022.1008024 |
| Volume Number | 13 |
| Journal | Frontiers in Genetics |
| Language | English |
| Publisher Date | 2023-01-17 |
| Access Restriction | Open |
| Subject Keyword | Heat Drought Genome Breeding Yield Genotypes Chromosome Wheat |
| Content Type | Text |
| Resource Type | Article |
| Subject | Genetics Molecular Medicine Genetics (clinical) |
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