桉树焦枯病菌（Calonectria pseudoreteaudii）生物学特性测定

摘要

丽赤壳属多数种是桉树焦枯病（ Cylindrocladium leaf blight）重要致病菌，掌握病原菌生物学特性有助于从病原角度了解病害发生发展，科学指导防治。对桉树焦枯病致病菌株Calonectria pseudoreteaudii生物学特性进行测定。结果表明：该菌株菌丝生长以燕麦片琼脂培养基生长最快，最适温度为24-26℃，最适pH值为7．0，而光照条件不影响菌丝生长；菌株产孢最适温度为25℃，最适pH值为6．0，以光照、PDA培养基产孢量较高；分生孢子萌发与相对湿度成正相关，最适温度为28℃，最适pH值为6．0，黑暗有助于孢子萌发。%Absrt act:Calonectria spp., particularly in their Cylindrocladium anamorph form, are well-known pathogens associated with Cylin-drocladium leaf blight.For the purpose of understanding the biological characteristics of Ca.pseudoreteaudii YA5j2 and guiding how to control this disease, biological characteristics of this isolate were determined.The optimal conditions for mycelium growth were oatmeal agar medium with pH 7.0 cultivated at 24-26℃, and illuminance had no significant effect on hyphae growth.The suitable conditions for spore production were potato dextrose agar medium with pH 6.0 cultivated at 25℃in the light.Conidium germination had a positive correlation with relative humidity, and conidium under the circumstance with high humidity, pH 6.0, temperature at 28 ℃, and without illumination contributed to germination.