Identifying loci influencing grain number by microsatellite screening in bread wheat (Triticum aestivum L.)

文献类型： 外文期刊

第一作者： Zhang, Dongling

作者： Zhang, Dongling;Hao, Chenyang;Wang, Lanfen;Zhang, Xueyong

作者机构：

关键词： Association mapping;Grain number;Mini core collection;SSR;Triticum

期刊名称：PLANTA （ 影响因子：4.116； 五年影响因子：4.316 ）

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年卷期：

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收录情况： SCI

摘要： Grain number (GN) is one of three major yield-related components in wheat. We used the Chinese wheat mini core collection to undertake a genome-wide association analysis of grain number using 531 SSR markers randomly located on all 21 chromosomes. Grain numbers of all accessions were measured in four trials, i. e. two environments in four growing seasons. Association analysis based on a mixed linear model (MLM) revealed that 27 SSR loci were significantly associated with mean GN (MGN) estimated by the best linear unbiased predictor (BLUP) method. These included numerous breeder favorable alleles with strong positive effects at 23 loci. Significant or extremely significant differences were detected on MGN between varieties conveying favored allele and varieties with other alleles. Moreover, statistical simulation showed that the favored alleles have additive genetic effects. Although modern varieties combined larger numbers of favored alleles, the numbers of favored alleles were not significantly different from those in landraces, especially those alleles contributing mostly to the phenotypic variation. These results indicate that there is still considerable genetic potential for use of markers for genome selection of GN for high yield in wheat.

分类号： Q94

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