小麦品系P9897成株期抗条锈性遗传分析  

Genetic Analysis of Adult-plant Resistance to Stripe Rust in Wheat Line P9897

作　　者：张莹[1,2] 周新力[1,3] 王琪琳[1,3] 韩德俊[1,2] 黄丽丽[1,3] 康振生[1,3] 李海峰[1,2] 

机构地区：[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

出　　处：《麦类作物学报》2015年第10期1355-1359,共5页Journal of Triticeae Crops

基　　金：国家重点基础研究发展计划(973计划)项目(2013CB127700);国家自然科学基金项目(31201497);国际科技合作与交流专项(2011DFG32990);国家小麦产业技术体系专项(CARS-3-1-11)

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（Infectiontype，IT）=2]，在两个试验地的严重度（Diseaseseverity，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（X^2=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X^2=0．18〈5．99；天水X^2=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。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 du- rable resistance. In this study,P9897 and Mingxian 169 were identified for seedling and adult plant re- sistance in the greenhouse. Mingxian 169 was crossed with P9897 and F1 ,F2 and Fa progeny were ob- tained. 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 sus- ceptible （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.

关 键 词：小麦 条锈病 成株期抗性 遗传分析 

分 类 号：S512.1[农业科学—作物学] S330