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关于小麦白粉病菌(Egysiphe grami-nisf、sp。tritici)有性阶段生物学特性的研究,目前国内外报道甚少,说法不一,至今有性阶段在侵染循环中的作用尚未弄清。据有关资料报道:病菌在5月和11月分别在秋播小麦成株和夏播或自生小麦成株上各产生一次闭囊壳,越季后产生子囊孢子,作为初侵染源之一。但我们80年11月在花溪区高坡公社秋苗黄化的病叶上发现了闭囊壳和子囊,81年2月在病圃孕穗期的下部叶片和室内瓶栽苗的病叶上亦发现了闭囊壳和子囊,未发现子囊孢子;80年10月将麦收时放于冰箱中的闭囊壳和放于室温下的闭囊壳同时保湿,前者形成子囊孢子,并且接种成功,而后者则未形成,且子囊出现空胞现象。因此,为了探明该病菌有性阶段在侵染循环中的作
At present, few reports on the biological characteristics of the sexual stage of the powdery mildew of Egysiphe grami-nisf (sp. Tritici) have been reported at home and abroad, so far the role of the sexual stage in the infection cycle has not yet been clarified. According to the data reported: bacteria in May and November, respectively, in autumn sowing and summer sowing or self-grown wheat, each produced a closed shell, after the season to produce ascospores, as one of the primary sources of infection. However, in November 80, we found the closed shell and the ascus on the diseased leaves of the autumn and seedlings of the highland commune in Huaxi District. In February 1981, the diseased leaves of the lower leaves of the booting stage and the indoor bottle Found closed shell and ascus, ascospores were not found; October 80 will be closed at the time of the wheat closed capsule in the refrigerator and placed at room temperature, while the closed shell and shell moisture, the former form ascospores and inoculation success, and then Those who did not form, and ascus empty cell phenomenon. Therefore, in order to ascertain the sexual stage of the bacteria in the infection cycle for