小偃6号成株期高温抗条锈性遗传分析

Inheritance analysis of adult plant high-temperature stripe rust resistance in wheat cultivar Xiaoyan 6

中文关键词:小偃6号  小麦条锈菌  成株高温抗条锈性  遗传分析

keywords:Xiaoyan 6  Puccinia striiformis f.sp.tritici  adult-plant high-temperature tripe rust resistance  inheritance analysis

中文摘要:为揭示小偃6号抗病机制和培育持久抗病品种,采用常规杂交分析方法,在小麦抽穗期利用小麦条锈菌小种CYR30、CYR32和Su11-4对小偃6号、铭贤169及其杂交F1、F2、F2∶3接种,平均气温达到21℃时对小偃6号进行了抗条锈性调查和遗传分析。结果显示,接种CYR30、CYR32时,F1代表现高感,F2代群体中抗感分离比例符合1 R∶15 S的理论比例。接种Su11-4时,F1代表现高抗,F2代群体中抗感分离比例符合3R∶1S的理论比例。研究表明小偃6号对CYR30、CYR32的抗病性均由2对隐性基因累加作用控制,对Su11-4的抗病性由1对显性基因控制。

Abstract:In order to reveal the resistance mechanism to stripe rust and develop durable resistance cultivar, the segregating populations were developed from the cross of Xiaoyan 6 with susceptible cultivar Mingxian 169. Adult plants of parents, F₁, F₂ and F_2:3 progeny were tested with selected Chinese preponderance Pst races (CYR30, CYR32 and Su11-4) during the heading stage. All of F₁ hybrids of such crosses were highly susceptible and F₂ population displayed the segregation into resistance and susceptible while inoculated with CYR32 at the adult plant stage. The chi-square test result confirmed that the frequencies of resistance versus susceptible individuals were in accordance with the 1 R:15 S ratio in F₂ population. The results indicated that the resistance of Xiaoyan 6 to the race CYR30 or CYR32 was controlled by the resistance complementary action of two pairs of recessive genes. All of F₁ plants were resistant to Su11-4. And F₂ plants fitted a 3 R:1 S ratio. The resistance of Xiaoyan 6 to the race Su11-4 was controlled by one dominant gene.