4.6 Article

A GBS-based genome-wide association study reveals the genetic basis of salinity tolerance at the seedling stage in bread wheat (Triticum aestivum L.)

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FRONTIERS IN GENETICS
卷 13, 期 -, 页码 -

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FRONTIERS MEDIA SA
DOI: 10.3389/fgene.2022.997901

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GBS; abiotic stress; salt tolerance; association mapping; Triticum aestivum L; candidate genes; MGIDI; SNP

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This study evaluated salt tolerance-related traits in 138 pre-breeding lines, identifying 63 significant marker-trait associations and candidate genes. The best-performing lines under salt stress were determined using the Multi-Trait Genotype-Ideotype Distance Index (MGIDI) protocol. Identified SNPs and genotypes with favorable alleles provide a valuable resource for enhancing salt tolerance in wheat.
High salinity levels affect 20% of the cultivated area and 9%-34% of the irrigated agricultural land worldwide, ultimately leading to yield losses of crops. The current study evaluated seven salt tolerance-related traits at the seedling stage in a set of 138 pre-breeding lines (PBLs) and identified 63 highly significant marker-trait associations (MTAs) linked to salt tolerance. Different candidate genes were identified in in silico analysis, many of which were involved in various stress conditions in plants, including glycine-rich cell wall structural protein 1-like, metacaspase-1, glyceraldehyde-3-phosphate dehydrogenase GAPA1, and plastidial GAPA1. Some of these genes coded for structural protein and participated in cell wall structure, some were linked to programmed cell death, and others were reported to show abiotic stress response roles in wheat and other plants. In addition, using the Multi-Trait Genotype-Ideotype Distance Index (MGIDI) protocol, the best-performing lines under salt stress were identified. The SNPs identified in this study and the genotypes with favorable alleles provide an excellent source to impart salt tolerance in wheat.

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