Genome-wide association for grain yield under rainfed conditions in historical wheat cultivars from Pakistan

文献类型： 外文期刊

第一作者： Ain, Qurat-ul

作者： Ain, Qurat-ul;Anwar, Alia;Mahmood, Tariq;Quraishi, Umar M.;Rasheed, Awais;Xia, Xianchun;He, Zhonghu;Rasheed, Awais;He, Zhonghu;Mahmood, Tariq;Imtiaz, Muhammad

作者机构：

关键词： spring bread wheat;genome-wide association studies (GWAS);marker trait association;single nucleotide polymorphism (SNP);90K SNP assay;gene annotation;grain yield

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.753； 五年影响因子：6.612 ）

ISSN： 1664-462X

年卷期： 2015 年 6 卷

页码：

收录情况： SCI

摘要： Genome-wide association studies (GWAS) were undertaken to identify SNP markers associated with yield and yield-related traits in 123 Pakistani historical wheat cultiyars evaluated during 2011-2014 seasons under rainfed field conditions. The population was genotyped by using high-density Illumina iSelect 90K single nucleotide polymorphism (SNP) assay, and finally 14,960 high quality SNPs were used in GWAS. Population structure examined using 1000 unlinked markers identified seven subpopulations (K = 7) that were representative of different breeding programs in Pakistan, in addition to local landraces. Forty four stable marker-trait associations (MIAs) with -log p 4 were identified for nine yield-related traits. Nine multi-trait MTAs were found on chromosomes 1AL, 1BS, 2AL, 2BS, 2BL, 4BL, 5BL, 6AL, and 6BL, and those on 5BL and 6AL were stable across two seasons. Gene annotation and syntey identified that 14 trait-associated SNPs were linked to genes haying significant importance in plant development. Favorable alleles for days to heading (DH), plant height (PH), thousand grain weight (TGVV), and grain yield (GY) showed minor additive effects and their frequencies were slightly higher in cultiyars released after 2000. However, no selection pressure on any favorable allele was identified. These genomic regions identified have historically contributed to achieve yield gains from 2.63 million tons in 1947 to 25.7 million tons in 2015. Future breeding strategies can be devised to initiate marker assisted breeding to accumulate these favorable alleles of SNPs associated with yield-related traits to increase grain yield. Additionally, in silico identification of 454-contigs corresponding to MTAs will facilitate fine mapping and subsequent cloning of candidate genes and functional marker development.

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