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首页> 外文期刊>Plant Pathology >Light and scanning electron microscopy studies of the early infection stages of Hymenoscyphus pseudoalbidus on Fraxinus excelsior
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Light and scanning electron microscopy studies of the early infection stages of Hymenoscyphus pseudoalbidus on Fraxinus excelsior

机译：光和扫描电镜研究假单胞菌在优良水曲柳上的早期感染阶段

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摘要

The ontogeny and morphology of infection structures associated with the early stages of infection of Hymenoscyphus pseudoalbidus on common ash (Fraxinus excelsior) leaves and leaf petioles were investigated using light and scanning electron microscopy. Ascospores were produced in mature ascocarps and infections on ash leaves were first observed 2 weeks later. Ascospores developed germ tubes, followed by appressorium formation and penetration of epidermal cells on ash leaves and petioles. Chalara fraxinea spores, the anamorph of H. pseudoalbidus, appeared and were arranged in chains, surrounded by a membranous sheath, and varied considerably in size and shape. Host invasion and colonization of all cell types of leaves and petioles were observed using light microscopy. The role of leaves and petioles as sites of infection in the life cycle of H. pseudoalbidus and the disease cycle of ash dieback is discussed.
机译：利用光学和扫描电子显微镜研究了与普通灰（Fraxinus excelsior）叶片和叶柄上的假拟膜金丝藻感染初期有关的感染结构的形态学和形态。子囊孢子在成熟的果树椰子中产生，并且在两周后首次观察到灰叶上的感染。子囊孢子发育出胚芽管，随后在灰烬的叶和叶柄上的前生器官形成和表皮细胞渗透。假拟南芥的无性型Chalara fraxinea孢子出现并排列成链状，被膜状鞘包围，大小和形状变化很大。使用光学显微镜观察到叶片和叶柄所有细胞类型的宿主入侵和定殖。讨论了叶和叶柄作为假性假单胞菌的生命周期以及灰烬枯萎病的发病周期感染部位的作用。

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