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作者	单位
陈士强，黄泽峰，张勇，葛江燕，朱雪，高勇，陈建民	（1.扬州大学生物科学与技术学院，江苏扬州，225009； 2.江苏里下河地区农业科学研究所，江苏扬州，225007）

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中文摘要:

长穗偃麦草具有良好的赤霉病抗性，是小麦赤霉病抗性改良的重要种质资源。为了深入研究长穗偃麦草的赤霉病抗性并对其抗性相关基因进行染色体定位，连续两年两地于开花期通过单花滴注法对中国春长穗偃麦草二体附加系、置换系等31份材料进行穗部接种，21 d后调查发病情况；同时调查了各材料的自然发病情况。结果表明，长穗偃麦草的赤霉病抗性主效基因定位于1E和7E染色体，其中7E染色体的短臂具有良好的赤霉病抗性，2E和4E染色体具有微效抗性基因，而3E、5E和6E可能存在易感基因。

英文摘要:

Fusarium head blight, or scab, caused by Fusarium graminearum Schwabe, is one of the most devastating wheat diseases, causing both yield loss and quality reduction. Some of allied species of wheat possess excellent resistance genes. So it is very important to find the relevant resistance genes in allied species of wheat to improve wheat genotypes in FHB resistance.Lophopyrum elongatum is one of the important allied species of wheat. As its good resistance to FHB, it is considered to be the most important germplasm resource for genetic improvement in wheat. In this paper, the resistance of Chinese Spring Lophopyrum elongatum disomic addition lines, disomic substitution lines, Chinese Spring, Annong 8455 and Sumai 3 were evaluated by injecting Fusarium graminearum Schwabe through single floret injection for two years and in two places.At 21 days after injection, the disease spikelet rate was investigated. Meanwhile, the disease spikelet rate in nature also was investigated. It indicates that chromosomes 1E and 7E play important roles in the resistance to FHB, and the short arm of chromosome 7E has good resistance. Chromosomes 2E and 4E may have weak resistance, while chromosomes 3E, 5E and 6E may have susceptible genes to FHB. If the resistance genes in chromosomes 1E and 7E of Lophopyrum elongatum were fully exploited and transfered into wheat, it would provide important germplasm resources for breeding new wheat varieties.

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