水稻橙叶病的研究

水稻橙叶病自1978年在我国云南发现以来,近年在福建,广东和广西的一些地区亦有发生。研究表明,病害只能由电光叶蝉(Recilia dorsalis)传播;两种黑尾叶蝉和三种飞虱不能传播,汁液摩擦和带病土壤也不传病。病毒在电光叶蝉体内属增殖型。病株超薄切片在电镜下见到类似病毒的球状颗粒,直径约15nm,病害对四环素不敏感,因此认为我国水稻橙叶病的病原似应是病毒,而非类菌原体。

STUDIES ON RICE ORANGE LEAF DISEASE

Since the discovery of rice orange leaf disease in Yunnan province. China.1978.some other provinces such as Fujian.Guangdong and Guangxi also have found the same disease recently.Investigations showed that the disease could only be transmitted through the Zig-zag rice leafhopper (Recilia dorsalis),while two other species of rice leafhoppers (Nephotettix cincticeps,N virescens)and three species of planthoppers (Nilaparvata lugens.N bakeri and N muirichina)did not transmit it Besides,it was noncontagious from the soil,or even through mechanical means by the sap of diseased plants.The virus incubates and spreads by the insect vector. Recilia dorsalis Electron microscopic examinations of ultrathin sections of the diseased plant tissue revealed that the virus-like particles appeared spherical in shape and measured 15 nm in diameter.Being not sensitive to the treatment with tetracycline antibiotics,we thus concluded that the pathogen in China is not a MLO,but most likely a virus.