Identification of QTLs for resistance to Fusarium head blight, DON accumulation and associated traits in the winter wheat variety Arina
Identification of QTLs for resistance to Fusarium head blight, DON accumulation and associated traits in the winter wheat variety Arina
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DOI：
10.1007/s00122-007-0592-3
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发表时间：
2007-09-01
影响因子：
5.4
通讯作者：
Nicholson, P.
中科院分区：
文献类型：
--
作者：
Draeger, R.;Gosman, N.;Nicholson, P.
小麦赤霉病（FHB）已成为许多国家小麦作物的严重威胁。除了产量和质量的损失，这种疾病是最重要的，因为污染的谷物与真菌毒素，如脱氧雪腐镰刀菌烯醇（DON）。瑞士冬季品种Arina对FHB具有显著抗性。本研究的目的是定位数量性状位点（QTL）的抗性FHB，DON积累和相关性状的谷物在双单倍体（DH）人口之间的杂交Arina和FHB敏感的英国品种Riband。在不同年份和地点的五项试验中评估了FHB抗性。共检测到10个与赤霉病抗性相关的QTL，其中QTL来自双亲。在本研究中检测到的QTL很少与其他两个研究的作者在Arina的FHB抗性的报告。它的结论是，FHB抗性的Arina，像其他欧洲冬小麦品种研究到目前为止，是由几个基因的中等效果，使其难以利用分子标记辅助选择育种计划。对赤霉病抗性最显著、最稳定的QTL位于4D染色体上，与株高的Rht-D1位点共定位。这种关联似乎是由于连锁有害基因的Rht-D1 b（Rht 2）半矮化等位基因，而不是在高度本身的差异。这种关联可能会损害努力，以提高FHB抗性育种计划中使用含有该等位基因的种质。
Fusarium head blight (FHB) of wheat has become a serious threat to wheat crops in numerous countries. In addition to loss of yield and quality, this disease is of primary importance because of the contamination of grain with mycotoxins such as deoxynivalenol (DON). The Swiss winter cultivar Arina possesses significant resistance to FHB. The objective of this study was to map quantitative trait loci (QTL) for resistance to FHB, DON accumulation and associated traits in grain in a double haploid (DH) population from a cross between Arina and the FHB susceptible UK variety Riband. FHB resistance was assessed in five trials across different years and locations. Ten QTL for resistance to FHB or associated traits were detected across the trials, with QTL derived from both parents. Very few of the QTL detected in this study were coincident with those reported by authors of two other studies of FHB resistance in Arina. It is concluded that the FHB resistance of Arina, like that of the other European winter wheat varieties studied to date, is conferred by several genes of moderate effect making it difficult to exploit in marker-assisted selection breeding programmes. The most significant and stable QTL for FHB resistance was on chromosome 4D and co-localised with the Rht-D1 locus for height. This association appears to be due to linkage of deleterious genes to the Rht-D1b (Rht2) semi-dwarfing allele rather than differences in height per se. This association may compromise efforts to enhance FHB resistance in breeding programmes using germplasm containing this allele.