恶疫霉菌卵孢子和游动孢子在人参疫病侵染循环中的作用

Roles of Phytophthora Cactorum Oospores and Zoospores in Infection Cycle of Ginseng Blight

卵孢子是人参疫病进行初侵染的繁殖体,游动孢子是进行再侵染主要器官。用游动孢子接种参根,地上部产生典型症状只占发病参根的2.5％。接触传播是参床土壤中人参疫病根腐扩展蔓的主要方式。参根伤痕是疫病发生的诱因。指出了采用隔年土,大垄耕翻日晒,可促进卵孢子萌发,大量降低初接种量及保证参床排水透气性能的生态防病机理。

The oospores is the Propagator of the primary infection in Ginseng Blight andthe Zoospores in the main organ of the second infection. The typical symptom above ground had only 2.5 percent of diseased Ginsenginoculated them with Zoospores. The contagion is the major channel for GinsengBlight extension in the soil of Ginseng-bed. The root-scar is the predisposition ofGinseng Blight. The article shows that it is the ecological-control mechanism, that is, thefallow-soil,deep-ploughing and explosed-sun can promote Oostores germination andreduce the number of inoculation and ensure drainage and ventilation of Ginseng-bed.