乌头霜霉病病原菌形态学研究

Morphological study on pathogenicbacteria in Aconitum carmichaeli Debx. with downy mildew

目的明确乌头霜霉病病原菌的形态及其在植株上的传播方式。方法在药物栽培基地实地调查乌头霜霉病发病病状,显微镜下观察病原菌的形态,电子显微镜下观察病原菌的孢囊梗萌发以及在叶上的定植和传播方式。结果乌头霜霉病病原菌为霜霉科霜霉菌属乌头霜霉,通过游动孢子囊产生游动孢子,游动孢子产生芽管从叶上气孔侵入感染乌头。结论明确了乌头霜霉病病原菌的分类学地位,初步了解了病原菌在植物叶上的传播方式。

Objective To definite the morphology of pathogenicbacteria inAconitum carmichaeliDebx. withdowny mildew and its transmission mode between and within the plant.Methods The symptom of downy mildewwas surveyed at the cultivation base. The morphology of pathogenicbacteria as well as germination of sporangiphore,colonization and transmission mode were observed by electron microscope.Results The pathogenicbateria ofdowny mildew wasPeronospora aconiti,falling intoPeronosporaceae,genus ofPeronospora.Zoosperm was generatedby swarm sporangium,which produced germinal tube,then the sperm infected the plant through stoma on the leaves.Conclusion The study makes us definite taxonomic placement of pathogenicbacteria and get a premliminary under-standing about the transmission mode of pathogenicbacteria on the leaves.