三种麦类作物对叶(冠)锈菌非寄主抗病性与品种抗病性的组织病理学研究

比较研究了小麦、黑麦和燕麦对小麦叶锈菌、黑麦叶锈菌和燕麦冠锈菌的非寄主抗病性与品种抗病性的组织病理学特点。接种幼苗的荧光显微检查表明,非寄主抗病性除不同程度地中断侵入外,主要抑制侵染菌丝生长和吸器母细胞的形成,引起菌落早期败育和叶肉细胞坏死。这些特点与品种抗病性的过敏性坏死反应相同。这种类型的抗病性具有小种专化性,因而即使用遗传操作技术将这种非寄主抗病性转移到寄主品种中,也可能因病菌小种的变异而不会持久。

A Histopathological Study on Non-host and Cultivar Resistance of Wheat, Rye and Oat to Leaf and Crown Rusts

Non-host and cultivar resistance of wheat, rye and oat was compared following inoculation of primary leaves with Puccinia recondita f.sp. tritici, P. recondita f. sp. secalis and P. coronata, Histop.ithological examination by fluorescence microscopy indicated that the key features of non-host resistance were the early cessation of fungal growth, strong inhibition of haustorial mother cell formation, mesophyll cell necrosis and the early abortion of rust colony, although infection did not continue beyond the formation of appressorium or substomatal vesicle in a small number of infection sites of non-host. It was concluded that the histop thological characteristics of the examined non-host resistance were similar to hypersensitive response to resistant cultivar. This type of resistance was race-specific and it may not be durable when virulent structure of rust population changed.