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作者	单位
张莹，周新力，王琪琳，韩德俊，黄丽丽，康振生，李海峰	(1.西北农林科技大学旱区作物逆境生物学国家重点实验室，陕西杨凌 712100； 2.西北农林科技大学农学院，陕西杨凌 712100； 3.西北农林科技大学植物保护学院，陕西杨凌 712100)

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中文摘要:

小麦品系P9897对条锈病具有良好的成株期抗性。为给该品系的合理利用提供参考依据，在温室中对P9897和铭贤169进行苗期及成株期抗病性鉴定，在陕西杨凌（人工接种病原菌）和甘肃天水（自然诱发病原菌）2个地区对P9897和铭贤169及以P9897作为父本与铭贤169杂交获得的F₁、F₂和F₃代进行成株期抗病性鉴定，最终对其成株期抗条锈性进行遗传分析。结果显示，P9897成株期表现高度抗病性［反应型（Infection type,IT）=2］，在两个试验地的严重度（Disease severity,DS）平均值为5.0%~17.5%；所有F₁代表现为抗病（IT=2），F₂代抗病（IT: 0~6）和感病（IT：7~9）植株数符合13∶3的分离比（χ=0.79<3.84），F₃代抗病（IT: 0~3）、抗感分离（IT: 4~6）和感病（IT: 7~9）植株数符合7∶8∶1的分离比（杨凌χ=0.18<5.99；天水χ=0.66<5.99）；F₃代172株成株期小麦的反应型和严重度都是连续分布的。表明P9897的成株期抗条锈性是一种数量性状，由一显一隐2对基因独立控制或起重叠作用控制。

英文摘要:

Stripe rust (or yellow rust),which is caused by Puccinia striiformis f.sp. tritici(Pst),is a devastating fungal disease of common wheat. Breeding and planting resistant varieties is the preferred measures for controlling this disease. Spring wheat line P9897,has good adult-plant resistance and durable resistance. In this study,P9897 and Mingxian 169 were identified for seedling and adult plant resistance in the greenhouse. Mingxian 169 was crossed with P9897 and F₁,F₂ and F₃ progeny were obtained.Mingxian,P9897 and their progeny were inoculated with the physiological races of wheat stripe rust at Yangling,which were identified with natural inducing at Tianshui area. Then genetic analysis of adult-plant resistance to stripe rust in wheat line P9897 was conducted. P9897 was highly resistant ［IT (Infection type)=2］,with necrotic stripes and with no uredinia at both 9 scoring dates. P9897 had a mean DS (Disease severity) of 5.0%-17.5% across the two environments,and all of the F₁ plants showed IT=2.In addition,the F₂ population segregated with a 13 resistant (IT:0-6)∶3 susceptible (IT:7-9) ratio,and segregation of the F₃ lines fitted a 7 resistant (IT: 0-3)：8 segregating (IT: 4-6)：1 susceptible (IT:7-9) ratio. F₃ contained 172 adult plants and the ITs and DS were continuously distributed. These results indicated that the adult-plant resistance to stripe rust in P9897 was a quantitative character and controlled by two genes.

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