苎麻疫霉寄生专化性研究

 从棉铃、棉苗、构树、苧麻等植物上分离的苧麻疫霉(Phytophthora boehmeriae)菌株对上述各寄主植物进行交互接种测定致病性结果表明,分离自上述寄主植物的苧麻疫霉菌株对上述3种植物均能致病,表明不同寄主来源的苧麻疫霉菌株间致病性不存在对寄主植物的寄主专化性,但对各寄主植物的致病力有一定差异。此外,分离自棉苗和棉铃的苧麻疫霉各菌株对棉苗和棉铃具有相似的致病力;分离自构树的菌株多次接种棉苗后致病力逐渐增强,初步认为构树是棉疫病菌的野生寄主。

ON THE PARASITICAL SPECIALIZATION OF PHYTOPHTHORA BOEHMERIAE SAWADA

The pathogenicity of Phytophthora boehmeriae was tested by cross inoculating between the isolates obtained from cotton, common papermulberry (Broussonetia papyrifera) and ramie (Boehmeria nivea), and their host plants. Results showed that parasitical specializa-tion didn't present among the isolates of P. boehmeriae. The results also showed the pathogenic abilities of the isolates were different to their original as well as other host plants, while the pathogenic abilities of the isolates from cotton seedlings were similar to those isolates from cotton bolls. The pathogenicities of the isolates from common paper-mulbrry to cotton increased when they infected cotton seedlings continuously, it suggested that common papermulberry might be a wild host plant of the pathogen of cotton blight.