小麦白粉病菌在黑龙江省野生植物上寄主范围的研究

The Host Range of Wheat Powdery Mildew on The Wild Wheat Relative in Heilongjiang Province

用小麦白粉病菌１１个生理小种的混合菌种，对黑龙江省的小麦近缘野生植物的６属１０种的４５份材料进行接种，除１份免疫外，其余均接种成功。用其中６属１０种的３４份小麦近缘野生植物产生的白粉病菌分生孢子对小麦进行回接，亦全部回接成功。小麦白粉病菌生理小种对小麦近缘野生植物的寄生，像在小麦上一样，有明显的寄生专化性。感病小麦近缘野生植物的７７．３％对小麦白粉病菌的感病性，随生育期的推移而急剧下降。文中也讨论了小麦白粉病菌中间寄主的作用。

The mixture of 11 races of Erysiphe graminis f. sp tritici (EGT) was inoculated to 45 entries of wild wheat relatives (WWR) which belong to 10 species of six genera collected in Heilongjiang province. The result shows that all the entries were successfully infected by the EGT mixture except one. The result of inoculation by EGT obtained from 34 entries of WWR shows that the reinoculation to wheat was successful. All the wheat materials tested were infected. The parasiticum of the races of EGT on WWR had obvious host specificity as it on wheat. The susceptibility of 77. 3% susceptible WWR declined along with the increase of the age the plants.