关键词: 根系分泌物, 辣椒疫霉菌, 抗病性

Abstract: In order to analyze the correlation between pepper root exudates and its resistance to disease,the effect of root exudates from 4 different resistant pepper varieties on Phytophthora capsici was tested．The results show that the root exudates from resistant pepper varieties‘ PRMND’ and‘ DNP56’have significant
inhibition effect on mycelia growth, zoosporangium formation, zoospore release and cystospore germination of Phytophthora capsici．While the root exudates from‘ Kexing No.6’ and‘ Xinjiyu’, which are highly susceptible varieties, have no obvious effect on mycelia growth , the root exudates of‘ Kexing No.6 ’ has no obvious effect on the zoosporangium formation , the root exudates of‘ Xinjiyu’ has obvious effect the zoosporangium formation , the root exudates of‘ Kexing No.6’ and‘ Xinjiyu’ have obvious inhibition effect on the zoospore release and cystospore germination of Phytophthora capsici at 8 hours after treatment, but its inhibition is significantly lower than that of the resistant varieties.

Key words: Root exudate, Phytophthora capsici, Disease resistance