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Genetic mapping and localization of a major QTL for seedling resistance to downy mildew in Chinese cabbage (Brassica rapa ssp pekinensis)

文献类型： 外文期刊

作者： Yu, Shuancang 1 ; Zhang, Fenglan 1 ; Yu, Renbo 1 ; Zou, Yanmin 1 ; Qi, Jiani 1 ; Zhao, Xiuyun 1 ; Yu, Yangjun 1 ; Zhang, 1 ;

作者机构： 1.BVRC, BAAFS, Beijing 100097, Peoples R China

关键词： genome;disease resistance;linkage group;quantitative trait locus localization;genome reference map

期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）

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收录情况： SCI

摘要： Downy mildew caused by the fungus Peronospora parisitica is a serious threat to members of the Brassicaceae family. Annually, a substantial loss of yield is caused by the widespread presence of this disease in warm and humid climates. The aim of this study was to localize the genetic factors affecting downy mildew resistance in Chinese cabbage (Brassica rapa ssp. pekinensis). To achieve this goal, we improved a preexisting genetic map of a doubled-haploid population derived from a cross between two diverse Chinese cabbage lines, 91-112 and T12-19, via microspore culture. Microsatellite simple sequence repeat (SSR) markers, isozyme markers, sequence-related amplified polymorphism markers, sequence-characterized amplified region markers and sequence-tagged-site markers were integrated into the previously published map to construct a composite Chinese cabbage map. In this way, the identities of linkage groups corresponding to the Brassica A genome reference map were established. The new map contains 519 markers and covers a total length of 1,070 cM, with an average distance between markers of 2.06 cM. All markers were designated as A1-A10 through alignment and orientation using 55 markers anchored to previously published B. rapa or B. napus reference maps. Of the 89 SSR markers mapped, 15 were newly developed from express sequence tags in Genbank. The phenotypic assay indicated that a single major gene controls seedling resistance to downy mildew, and that a major QTL was detected on linkage group A8 by both interval and MQM mapping methods. The RAPD marker K14-1030 and isozyme marker PGM flanked this major QTL in a region spanning 2.9 cM, and the SSR marker Ol12G04 was linked to this QTL by a distance of 4.36 cM. This study identified a potential chromosomal segment and tightly linked markers for use in marker-assisted selection to improve downy mildew resistance in Chinese cabbage.

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