论文部分内容阅读
用采自云南省33个县的703个稻瘟病菌株与不同交配型的标准菌株交配结果表明,云南省稻瘟病菌中广泛存在着A、a两种交配型菌株.不同稻作区的有性世代形成率差异明显.一季晚籼稻区有性世代形成率高达94.4%,以下依次为水陆稻作区(49.2%)、籼粳交错区(24.0%)、单双季水稻区(21.7%)、高原粳稻区(20.2%)、高寒粳稻区(10%),即从南到北,有性世代形成率渐次下降,说明有性世代形成率随地理环境、气侯条件、生态条件及稻作类型的变化而变化.这对稻瘟病菌起源、传播及其遗传变异的研究是极富启发性的.
The results of mating with 703 M. grisea isolates collected from 33 counties in Yunnan Province and the standard strains of different mating types showed that there are two mating strains A and A in M. grisea in Yunnan Province. The rate of formation in each generation was significantly different from that in the late generation. The formation rate of sexual generation in late season indica rice reached as high as 94.4%, followed by that in the paddy field (49.2%), the cross between indica and japonica (24.0%), the single and double season rice (21.7%), In the plateau japonica rice area (20.2%) and the alpine japonica rice area (10%), the formation rate of the sexual generation decreased gradually from south to north, indicating that the formation rate of the sexual generation varies with the geographical environment, the climatic conditions, the ecological conditions and the type of rice cultivation Which is very enlightening on the origin, dissemination and genetic variation of Magnaporthe grisea.