小麦白粉菌早期发育与初侵染行为的细胞学研究

Cytological Studies on Development and Primary Infection of Erysiphe graminis f.sp. tritici in Wheat

病菌孢子的萌发不受寄主专化抗性的影响，在叶面及玻片上均可正常进行；但有些抗源材料可抑制附着胞分瓣的正常分化；附着胞分瓣的形成需要一定的接触刺激，否则将导致产生纤细附着胞；病菌附着胞的多分瓣现象是其多次入侵的表现；高抗性小麦品种多在病菌吸器产生前发生过敏性坏死反应；乳突频率的高低与乳突抗性强弱无必然联系。

The studies on development and primary infection of Erysiphe granminis f.sp. tritici were conducted with light and scanning electron microscopy in this paper.The results showed that the conidia could be germinated both on leaves of all wheat cultivars and glass slides,without any significant effects of cultivar specific resistance on germination,but some cultivars inhibited the differentiation of appressorial lobe,the fungal infection organ.A contact stimulation was necessary for appressorial formation,otherwise thin appresorial would be produced.The multiple differentiation presences of the appresoriums were resulted from their repeated inflections.In high resistant hosts,the hypersensitive responses might happen prior to the present of fungal primary haustorium in the cell.THere was no positive relation between papilla frequency and papillaassociated resistance.