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田间选出的五个大麦品种具与白粉病局部抗性,但缺乏可识别的、小种专化的抗性因子。本文研究了这几个大麦品种上的白粉病发展情况。接种试验证实了菌落数量的减少是这一抗性的主要组分。第四叶和第五叶叶段的显微观察显示了菌落在其扩展的几个时期里受到限制。病菌个体之不能穿透寄主、长成菌落是由于寄主表皮细胞的过敏性或非过敏性抗性。在供试各品种以及感病对照间,这两种类型的抗性机制所占比额有明显不同。在四个抗性品种里,以某一种机制占主导地位。是否能将不同机制的抗源综合起来以加强局部抗性,也进行了讨论。
Five barley cultivars selected in the field had local resistance to powdery mildew, but lacked identifiable, small-scale specific resistance factors. This article studies the development of powdery mildew on these barley varieties. Vaccination experiments confirmed that the reduction of the number of colonies is a major component of this resistance. Microscopic observations of the fourth leaf and the fifth leaflet show that colonies are limited for several periods of their expansion. Individuals can not penetrate the host virus, grow into colonies due to host epidermal cells allergic or non-allergic resistance. The proportions of these two types of resistance mechanisms are significantly different among the tested varieties and the susceptible controls. In one of four resistance varieties, one mechanism dominates. Discussions were also held on whether the resistance of different mechanisms could be combined to enhance local resistance.