黄瓜霜霉病菌侵染若干因子的研究

摘要/Abstract

摘要： 研究了温、湿度条件对黄瓜霜霉病菌致病性的影响,结果表明,25～35℃最适宜黄瓜霜霉病的发生,15/35℃的交替温度变化最有利于霜霉病菌的侵染,但35℃以上的高温对霜霉病菌具有杀伤作用;2 h的湿度条件就足以引起侵染,一旦侵入寄主,环境湿度条件对病害的发展影响不大.-20℃低温冷冻保存10个月和干燥放置7 d的霜霉菌种仍具致病力.发病的黄瓜叶片可以连续产生孢子囊,但随着发病时间的延长产生孢子囊量逐渐减少.活体叶片单位面积上产生的孢子囊量比离体叶片大,且显症天数与叶片单位面积产生孢囊量呈抛物线型关系.

关键词: 霜霉病菌, 温度, 湿度, 产孢潜能

Abstract: The study on the effects of temperature and humidity on the pathogenicity of Pseudoperonospora cubensis showed that the optimum temperature for the occurrence of cucumber downy mildew was 25～35 ℃.An alternation of 15/35 ℃ was the most propitious to the infection of Pseudoperonospora cubensis,while the high temperature above 35 ℃ could kill the pathogens.2 hours humid was enough for infection.Pseudoperonospora cubensis stored at-20 ℃ for 10 months and dried for 7 days could still infect cucumber.The infected cucumber leaves could continuously produce sporangium,with its quantity gradually decreased with time.The quantity of sporangium produced in vivo was more than that in vitro.

Key words: Pseudoperonospora cubensis, Temperature, Humidity, Potentiality of producing sporangia

中图分类号:

S436

石延霞, 李宝聚, 刘学敏. 黄瓜霜霉病菌侵染若干因子的研究[J]. 应用生态学报, 2005, 16(2): 257-261.

SHI Yanxia, LI Baoju, LIU Xuemin . Several infection factors of Pseudoperonospora cubensis[J]. Chinese Journal of Applied Ecology, 2005, 16(2): 257-261.

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