茶蔗生柱锈菌选择性寄生茶蔗子植物的遗传分析

Genetic Relations of Ribes spp.with the Host Selection by Cronartium ribicola

为探讨转主寄主茶藨子植物的遗传背景与被茶藨生柱锈菌选择性寄生之间的关系。分析了7个五针松疱锈病典型发病区来源的11种茶蔗子植物之间的ITS遗传关系,并结合不同来源的寄主与病原之间交互接种实验的结果,比较不同发病区的茶蔗生柱锈菌孢子对不同转主寄主的感染亲和特性。结果显示:易被多个发病区的茶蔗生柱锈菌孢子所感染的茶藨子植物的ITS遗传关系很接近;荼蔗生柱锈菌特异性地选择生活地的茶蔗子植物作为寄主;地域分布广泛的茶藨子植物容易被多个发病区的茶蔗生柱锈菌选择作为转主寄主。本研究揭示出在茶蔗生柱锈菌特异地选择其转主寄主时,对寄主茶蔗子植物的遗传结构和地域分布范围有特异的倾向性。

In order to analyze the relationship of genetic background of Ribes plants with its susceptibility to the rust fungus, we carried out internal transcribed spacers（ITS） and cross-infection study on eleven Ribes spp. from 7 typical five-needle pine blister rust heavily occurred sites. The results showed that the Ribes plants being easily susceptible to the rust spores come from different sites were closely related in the ITS genetic relationship, the rust spores selected preferably the local Ribes spp. as alternate hosts, and the Ribes species which distributed broadly were more susceptible to the rust fungus than the other Ribes species. All the data suggested that the genetic features and geographical distribution of the Ribes determined the susceptibility to the rust fungus.