Validation and marker-assisted selection of DArT-genomic regions associated with wheat yield-related traits under normal and drought conditions

Frontiers in Genetics

Genetics

Karansher Singh Sandhu¹  Mostafa Hashem²  Ahmed Sallam³  Andreas Börner⁴  Saleh M. Ismail⁵ 

[1] Bayer Crop Sciences, Chesterfield, MO, United States;Department of Genetics, Faculty of Agriculture, Assiut University, Assuit, Egypt;Department of Genetics, Faculty of Agriculture, Assiut University, Assuit, Egypt;Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany;Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany;Soils and Water Department, Faculty of Agriculture, Assiut University, Assiut, Egypt;

关键词: DArT;    genetic validation;    wheat;    water deficit;    MAS;   

DOI  :  10.3389/fgene.2023.1195566

 received in 2023-03-28, accepted in 2023-05-10,  发布年份 2023

来源: Frontiers

【 摘 要 】

Quantitative trait loci (QTL) is one of the most important steps in marker-assisted selection. Few studies have validated quantitative trait loci for marker-assisted selection of yield traits under drought stress conditions in wheat. A set of 138 highly diverse wheat genotypes were tested under normal and drought stress conditions for 2 years. Plant height, heading date, spike length, grain number per spike, grain yield per spike, and 1000-kernel weight were scored. High genetic variation was found among genotypes in all traits scored under both conditions in the 2 years. The same panel was genotyped using a diversity-array technology (DArT) marker, and a genome-wide association study was performed to find alleles associated with yield traits under all conditions. A set of 191 significant DArT markers were identified in this study. The results of the genome-wide association study revealed eight common markers in wheat that were significantly associated with the same traits under both conditions in the 2 years. Out of the eight markers, seven were located on the D genome except one marker. Four validated markers were located on the 3D chromosome and found in complete linkage disequilibrium. Moreover, these four markers were significantly associated with the heading date under both conditions and the grain yield per spike under drought stress condition in the 2 years. This high-linkage disequilibrium genomic region was located within the TraesCS3D02G002400 gene model. Furthermore, of the eight validated markers, seven were previously reported to be associated with yield traits under normal and drought conditions. The results of this study provided very promising DArT markers that can be used for marker-assisted selection to genetically improve yield traits under normal and drought conditions.

【 授权许可】

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Copyright © 2023 Hashem, Sandhu, Ismail, Börner and Sallam.