A haplotype block associated with thousand-kernel weight on chromosome 5DS in common wheat (Triticum aestivum L.)

文献类型： 外文期刊

第一作者： Wang, Yuquan

作者： Wang, Yuquan;Zheng, Jun;Ma, Zhengqiang;Zhang, Xueyong;Wang, Yuquan;Zheng, Jun;Ma, Zhengqiang;Zhang, Xueyong;Wang, Yuquan;Hao, Chenyang;Zheng, Jun;Ge, Hongmei;Zhou, Yang;Zhang, Xueyong

作者机构：

关键词： Association mapping;haplotype;thousand-kernel weight;Triticum aestivum

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：7.061； 五年影响因子：6.002 ）

ISSN： 1672-9072

年卷期： 2015 年 57 卷 8 期

页码：

收录情况： SCI

摘要： Spike number per unit area, number of grains per spike, and thousand-kernel weight (TKW) are important yield components for wheat (Triticum aestivum L.). TKW has the highest heritability among the three components. We validated 27 simple sequence repeat (SSR) loci associated with TKW in an F-2:5 breeding population grown in four environments. A cfd78(265bp) marker on chromosome 5DS showed the strongest association with TKW and had a significantly positive effect on TKW compared to allele cfd78(259bp), with mean increases of 5.17, 3.63, 4.11, and 5.16g in the four environments. Markers cfd67 and cfd40 flanking cfd78 also showed significantly positive associations with TKW with increases of 5.11, 3.29, 4.31, and 4.50g for cfd67(205), and 4.98, 3.49, 4.06, and 4.84g for cfd40(187) compared with cfd67(203)and cfd40(190) in the four environments, respectively. A major quantitative trait locus for TKW spanning 2.94 cM on chromosome 5DS was detected by association mapping. Strong linkage disequilibrium (LD) (r(2)>0.2) was detected among the three linked markers, which formed three haplotype blocks in the F-2:5 breeding population. Mean TKW differences between HapB-I and HapB-II were 5.80, 4.41, 4.02, and 5.06g in the four environments, respectively. Moreover, significant LD was detected only between cfd78 and cfd67 and between cfd67 and cfd40 in a germplasm collection. This study provides a base for cloning genes related to TKW on chromosome 5DS.

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