小麦条锈菌异核作用产生的一新菌系

A New Isolate Produced by the Heterokaryosis of Wheat Stripe Rust

在小麦条锈菌黄色和白色夏孢子菌系混合繁殖的群体中,筛选出一新的白化菌系。新菌系在鉴别寄主上的反应型明显不同于两原始菌系,其夏孢子芽管的多核率较原始菌系高,这些结果表明该新菌系是经异核作用产生的。本研究还发现,新苗系的多核率随继代转接而下降,但其毒性不变。

A new albino isolate of wheat stripe rust was selected from the mixture of two original races with yellow or white spore color. It was found that the reaction types of the new isolate on the differentials were obviously different from those of two original races, and the multinucleal rate in germ tube of the new isolate was higher than that of two original races. The results here indicated that the new isolate was produced by means of heterokaryosis. Forthermore, it was obserred that the multinucleal rate in germ tube of the new isolate decreased with generations, but its virulence remained stable.