小麦中一个抗禾谷孢囊线虫新QTL的定位
Mapping of a novel QTL for resistance to cereal cyst nematode in wheat.
作者信息
Williams K J, Willsmore K L, Olson S, Matic M, Kuchel H
机构信息
Cooperative Research Centre for Molecular Plant Breeding, South Australian Research and Development Institute, Urrbrae, SA 5064, Australia.
出版信息
Theor Appl Genet. 2006 May;112(8):1480-6. doi: 10.1007/s00122-006-0251-0. Epub 2006 Mar 15.
Cereal cyst nematode (CCN; Heterodera avenae Woll.) is a root pathogen of cereals that can cause severe yield losses in intolerant wheat cultivars. Loci for resistance to CCN, measured by a seedling bioassay, were identified by creating a genetic map based on a Trident/Molineux doubled haploid population of 182 lines. A novel locus accounting for up to 14% of the resistance to CCN was mapped to chromosome 1B of Molineux by association with microsatellite marker loci Xwmc719 and Xgwm140. This locus acts additively with the previously identified CCN resistance loci identified on chromosomes 6B (Cre8) and 2A (Cre5 on the VPM1 segment) in this population to explain 44% of the genetic variance for this major wheat pathogen.
谷物孢囊线虫（CCN；燕麦孢囊线虫Heterodera avenae Woll.）是谷物的一种根部病原体，会给不抗病的小麦品种造成严重的产量损失。通过基于182个品系的Trident/Molineux双单倍体群体构建遗传图谱，确定了通过幼苗生物测定法测得的对CCN的抗性位点。通过与微卫星标记位点Xwmc719和Xgwm140关联，一个对CCN抗性贡献率高达14%的新位点被定位到Molineux的1B染色体上。该位点与该群体中先前在6B染色体（Cre8）和2A染色体（VPM1区段上的Cre5）上鉴定出的CCN抗性位点呈加性作用，可解释该主要小麦病原体44%的遗传变异。
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