不同抗性辣椒品种根系分泌物对疫霉菌的影响

为分析辣椒根系分泌物与抗疫病的相关性，测定了4 个不同抗性辣椒品种的根系分泌物对辣椒疫霉菌的影响。结果表明：对辣椒疫病表现抗病的PRMND 和DNP56 的根系分泌物对疫霉菌的菌丝生长、游动孢子囊形成、游动孢子释放和休止孢子萌发均有显著的抑制作用，而对辣椒疫病表现高度感病的科星6 号和新机遇的根系分泌物对疫霉菌的菌丝生长没有明显影响，科星6 号根系分泌物对游动孢子囊的形成没有明显的影响，而新机遇根系分泌物对游动孢子囊形成有明显抑制作用，科星6 号和新机遇的根系分泌物对游动孢子释放和处理8 h 后对休止孢子萌发具有明显的抑制作用，但其抑制效果显著低于抗病品种。

Effects of Root Exudates from Different Resistant Pepper Varieties on Phytophthora capsici

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.