小麦白粉菌对栽培和野生小麦族植物的侵染

STUDIES ON THE INFECTION OF ERYSIPHE GRAMINIS TRITICT ON WILD AND CULTIVATED GRASSES OF THE TRIBE TRITICEAE

本文报道了在隔离的人工接种条件下,用小麦白粉菌的2个分离菌成功地侵染了小麦族的12属40个材料(不包括小麦属)。实验证明小麦白粉菌的侵染范围并不只限于小麦属,而是较为广泛地侵染小麦族的一些属和种。多数材料在接种后所产生的繁殖体,回接小麦也获成功。根据试验结果和野外调查,四川西部常见的披硷草和鹅观草等野生禾本科植物,可能在小麦白粉属的越夏和初侵染中起着重要的作用。

Experiment was conducted under artificial inoculation condition.Two isolates of Erysiphe graminis tritici were used.Grasses of 40 species and varieties in 12 genera of the tribe Triticeae,including some widely distributed perennial wild grasses in the west region in Sichuan were successfully infected by artificial inoculation.The results showed that the infeetion range of the fungus was wider than heretofore had expected.It's specialization of path ogenicity was not on a single genus,but on a group of grasses and cereals being related to Tritieum.The results also suggested that the wild grasses,Elymus spp.and Roegneria spp.might serve as a sourse of primary infection of powdery mildew of wheat.