Design of a Brassica rapa core collection for association mapping studies

文献类型： 外文期刊

第一作者： Zhao, Jianjun

作者： Zhao, Jianjun;Del Carpio, Dunia Pino;Basnet, Ram Kumar;Zhang, Ningwen;Li, Fei;Bucher, Johan;Visser, Richard G. F.;Bonnema, Guusje;Zhao, Jianjun;Artemyeva, Anna;Gao, Jie;Li, Fei;Wang, Xiaowu

作者机构：

关键词： Brassica rapa;morphotypes;structure;alleles;association mapping;doubled haploids

期刊名称：GENOME （ 影响因子：2.166； 五年影响因子：2.474 ）

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收录情况： SCI

摘要： A Brassica rapa collection of 239 accessions, based on two core collections representing different morphotypes from different geographical origins, is presented and its use for association mapping is illustrated for flowering time. We analyzed phenotypic variation of leaf and seed pod traits, plant architecture, and flowering time using data collected from three field experiments and evaluated the genetic diversity with a set of SSR markers. The Wageningen University and Research Centre (WUR) and the Vavilov Research Institute of Plant Industry (VIR) core collections had similar representations of most morphotypes, as illustrated by the phenotypic and genetic variation within these groups. The analysis of population structure revealed five subgroups in the collection, whereas previous studies of the WUR core collection indicated four subgroups; the fifth group identified consisted mainly of oil accessions from the VIR core collection, winter oils from Pakistan, and a number of other types. A very small group of summer oils is described, that is not related to other oil accessions. A candidate gene approach was chosen for association mapping of flowering time with a BrFLC1 biallelic CAPS marker and a BrFLC_2 multiallelic SSR marker. The two markers were significantly associated with flowering time, but their effects were confined to certain morphotypes and (or) alleles. Based on these results, we discuss the optimal design for an association mapping population and the need to fix the heterogeneous accessions to facilitate phenotyping and genotyping.

分类号： Q3

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