为鉴定和利用武都白茧的抗条锈病基因，本研究将武都白茧与高感条锈病品种铭贤169杂交，分别于2015年和2016年在陕西杨凌和甘肃天水四个环境中对武都白茧、铭贤169和以及铭贤169/武都白茧杂交F_2:3代家系进行成株期抗条锈病测试。田间多年多点鉴定结果表明，武都白茧表现稳定的成株期抗条锈性，铭贤169/武都白茧F_2:3代在2015年杨凌、2016年杨凌、2015年天水和2016年天水四个环境下的相对病害曲线下面积（rAUDPC）均呈连续分布，表明武都白茧对条锈病的成株期抗性由多个QTL控制。利用集群分离分析法结合小麦660K SNP芯片、KASP和SSR标记鉴定与抗性位点连锁的多态性标记，运用完备区间作图法（BIP）和多环境表型鉴定数据（MET）两种QTL技术方法，检测到两个稳定的QTLs：QYrwdbj.nwafu-5A与QYrwdbj.nwafu-2B.1 。其中QYrwdbj.nwafu-5A位于小麦染色体5AS的缺失系5AS1-0.40-0.75和5AS3-0.75-0.98相邻的区域，解释15.02%-40.26%的表型变异；QYrwdbj.nwafu-2B.1位于小麦染色体2BS的缺失系C-2BS1-0.53上，解释9.54%-10.40%的表型变异。通过分子检测、抗病基因染色体定位和上位性分析表明，QYrwdbj.nwafu-5A很可能是一个需要与其它位点结合互作才能发挥抗条锈作用的新QTL。本研究将为进一步克隆武都白茧主效QTL，以及利用武都白茧主效QTL与其他有效抗条锈病基因或者QTL结合，培育持久抗条锈病品种提供科学依据。本研究的创新点是考虑环境对QTL的加性效应，从而提供QTL位置和效应方面更为全面遗传分析。

Stripe rust (yellow rust), caused by Puccinia striiformis f. sp. tritici (Pst), is one of the most devastating diseases of wheat throughout the world. H9020-1-6-8-3 is a translocation line originally developed from interspecific hybridization between wheat line 7182 and Psathyrostachys huashanica Keng and is resistant to most Pst races in China. To identify the resistance gene(s) in the translocation line, H9020-1-6-8-3 was crossed with susceptible cultivar Mingxian 169, and seedlings of the parents, F1, F2, F3, and BC1 generations were tested with prevalent Chinese Pst race CYR32 under controlled greenhouse conditions. The results indicated that there is a single dominant gene, temporarily designated as YrH9020a, conferring resistance to CYR32. The resistance gene was mapped by the F2 population from Mingxian 169/H9020-1-6-8-3. It was linked to six microsatellite markers, including Xbarc196, Xbarc202, Xbarc96, Xgpw4372, Xbarc21, and Xgdm141, flanked by Xbarc96 and Xbarc202 with at 4.5 and 8.3 cM, respectively. Based on the chromosomal locations of these markers and the test of Chinese Spring (CS) nullitetrasomic and ditelosomic lines, the gene was assigned to chromosome 6D. According to the origin and the chromosomal location, YrH9020a might be a new resistance gene to stripe rust. The flanking markers linked to YrH9020a could be useful for marker-assisted selection in breeding programs.