小麦新品种绵麦39成株期抗条锈性的遗传分析

绵麦39是2005年通过四川省审定的小麦新品种,它对条锈病表现高抗且抗性稳定。为了解绵麦39抗条锈性的遗传基础,为其进行抗条锈性的多元化抗源聚合育种提供理论参考,特进行了此试验。试验选用7个抗病品种(系)和3个感病品种(系),分别与绵麦39组配成抗×抗、抗×感组合,将亲本、F1与F2代于成株期用条中32生理小种进行人工接种,统计F2群体抗感分离比例,进行遗传分析与等位性分析。结果表明,绵麦39对条锈菌条中32的成株期抗性受一对显性基因的控制;绵麦39对条中32的抗性来源于抗条锈病材料贵农21-1(含有条锈病抗性基因YrGn21)。抗性基因YrGn21与YrCH42、Yr26基因具有等位性关系,而与抗条锈病材料贵农19-4、辽春10号以及CIMMYT材料ox-ley、96EW39(SW2148)含有的条锈病抗性基因有差异。同时对各抗病品种(系)的抗条锈性进行了探讨。

Genetic analysis of stripe rust resistance in Wheat Variety Mianmai 39

Mianmai 39, a new wheat variety released in Sichuan province in 2005, was highly resistant to Chinese newly predominant races of Chinese Yellow Race (CYR32) at adult stage. In order to determine the inheritance of resistance in Mianmai 39, seven resistant varieties and four susceptible varieties were used to cross with Mianmai 39, thus the F1 and F2 population were obtained. Resistance of parental varieties and their hybrid progenies were analyzed genetically by artificial inoculation with CYR32 at adult stages. The results showed, the resistance to stripe rust race CYR32 in Mianmai 39 at adult stages were controlled by one dominant gene,which derived from the variety Guinong 21.The gene might be an allelic locus of YrCH42 and Yr26,but differ to those in Guinong19-4 and liaochun 10, and also differ to those in oxley and 96EW39 (SW2148)which derived from CIMMYT. The resistance of the other resistant varieties were also discussed.