鄂西北地区小麦条锈菌主要流行小种的寄生适合度研究

 为准确预测条锈菌流行小种在鄂西北地区的变异动态，本研究采用抗性组分法测定了CYR32、CYR33对当地主栽品种的寄生适合度。结果表明:决定鄂西北小麦条锈菌最重要的寄生适合度组分依次为条锈菌的侵染能力、扩展能力和产孢能力;建立了小麦条锈菌寄生适合度属性3个主成份的数学模型;从总体结果看CYR32、CYR33均表现较高相对寄生适合度，且CYR32略高于CYR33，但相比感病对照品种和外来品种，供试小种对当地主栽品种鄂麦352和襄麦55表现出较低的寄生适合度。

Parasitic fitness of the major epidemic races of Puccinia striiformis f. sp. tritici in the northwest of Hubei province

In order to predict the dynamic variation of Puccinia striiformis f. sp. tritici in the northwest of Hubei province, the parasitic fitness of the most prevalent isolates CYR32, CYR33 were estimated through testing resistant components on wheat cultivars, Zhengmai 9023, Emai 352, Xiangmai 55, Xiaoyan 22 and Mingxian169. The results showed that the infectivity was the most important component of parasitic fitness, and then spread capacity and sporulation capacity. The mathematical models had been developed to estimate three principal components of pathogen parasitic fitness. In all, the relative parasitic fitness of isolates CYR32, CYR33 was high,and CYR32 was little higher than that of CYR33. The relative parasitic fitness on wheat cultivars,E-mai352, Xiang-mai55, was lower than that of other hosts.