黄瓜抗白粉性组织病理学研究

用整叶透明染色法研究了黄瓜白粉菌在不同抗病类型品种上的组织病理学表现。结果表明，抗病事件于附着胞产生后的各侵染阶段表达，随品种抗病性增强，附着胞畸形率增大，侵入率降低，吸器数目减少，菌落扩展缓慢，寄主细胞坏死发生时间早，机率高。此外，乳突出现频率与抗病性无关，抗病品种中乳突下形成的吸器较少，表明乳突具有一定的抗侵入作用。

Histopathology on the Cucumber Resistant to Sphaerotheca Fuliginea (Schlecht. )Poll.

Various cucumber cultivars with differen tresistan tlevels to Sphaerotheca fuliginea were studied on the histopathology through whole-leave staining.The results showed that none of the cult ivars expressed their resistance before mature appressoria were produced.With resistance increasing,the rate of abnormal appressoria increased,the penetration rate decreased,haustoria became fewer in number,mycelial growth slowed down,host cell necrosis occured earlier and more.Moreover,the frequency of papilla formation was not associated with the cultivar resistance,but the resistant cultivars produced fewer haustoria under papillae,suggesting that the papillae had some function against penetration.