北京地区板栗实腐病病原菌的致病性及侵染过程  

Pathogenicity of pathogens contributing to dry rot of Chinese chestnut and their infection process.

作　　者：贺伟[1] 沈瑞祥[1] 王晓军 

机构地区：[1]北京林业大学生物科学与技术学院,北京100083 [2]北京市怀柔县渤海镇林业站,北京101400

出　　处：《北京林业大学学报》2001年第2期36-39,共4页Journal of Beijing Forestry University

基　　金：国家自然科学基金项目 !(39870 6 40 )资助

摘　　要：北京地区板栗实腐病的病原菌有 5种 .在板栗怀黄品种处于不同活力状态的种子上接种 ,表明这些病原菌的致病性有差异 .Colletotrichumgloeosporioides致病性最强 ,受种子活力状态的影响较小 ;Dothiorellagregaria致病性较强 ,潜育期的长短受种子活力的影响较明显 ;Fusariumsolani,Phomopsissp .和Rhizopusstolonifer致病性较弱 ,仅在种子活力水平较低时致病 ,且发病率也低 .在栗果不同发育阶段和种子贮藏时期分离检查花器和栗果组织带菌状况 ,病原菌在板栗雌花受粉期以后开始侵入花柱和栗苞外壳 ,8月中旬花柱和果皮上的病原菌检出率明显增多 。Five species of pathogenic fungi were isolated from the decayed seeds of Chinese chestnut in Beijing area. The inoculation tests to the seeds of Chinese chestnut in three levels of vigor were conducted to determine the pathogenicity of the pathogens. Among the pathogens, Colletotrichum gloeosporioides was the most pathogenic species, and Dothiorella gregaria was the second, with its length of the incubation period noticeably affected by seed vigor, while Fasarium solani, Phomopsis sp. and Rhizopus stolonifer were weak pathogenic, and disease symptoms appeared only in seeds in lower level of vigor. Parts of flowers and fruits at various stages in succession and seeds in storage were isolated. Incidence of fungal colonies revealed that fungal colonization on styles and burrs started from pistillate flower pollinated. The colonies of the pathogens isolated from styles and pericarp increased markedly in the middle ten days of august and grew into the kernel progressively with the maturation of chestnut.

关 键 词：板栗 实腐病 致病性 侵染过程 病原菌 

分 类 号：S436.64[农业科学—农业昆虫与害虫防治]