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首页> 外文期刊>Mycologia >PERONOSPORA VICIAE ON PISUM SATIVUM - MORPHOLOGY OF ASEXUAL AND SEXUAL REPRODUCTIVE STRUCTURES
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PERONOSPORA VICIAE ON PISUM SATIVUM - MORPHOLOGY OF ASEXUAL AND SEXUAL REPRODUCTIVE STRUCTURES

机译：豌豆上的豌豆-无性和有性生殖结构形态

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Asexual and sexual reproductive structures of Peronospora viciae, which causes downy mildew of pea (Pisum sativum), were studied using low temperature scanning electron microscopy. Sporangiophores first appeared as outgrowths from stomata on abaxial leaflet surfaces 4-6 h after infected, glass-house-grown plants were exposed to high humidity. Sporangiophores continued to develop over the next 6 h, first as simple elongating hyphae, then branching from a single axis (monopodially) to produce multiple, terminal sporangia, which developed synchronously and polyblastically on each sporangiophore. Sporangia had smooth surfaces during development, were finely echinulate when mature, and were delimited by septa at the ends of terminal sporangiophore branches. Gametangia (oogonia and antheridia) developed extensively on inner surfaces of field-grown pea pods from smooth, bulbous hyphae adhering to the host epidermis. Each oogonium was surrounded by several antheridia. Oospores within pod tissue of field-grown plants were enclosed by oogonial membranes. Each oospore had a heavily reticulate outer wall enclosing cytoplasm and liquid, possibly lipid. Cryofixation and low temperature scanning electron microscopy have provided new insights into the morphology of reproduction in P. viciae. [References: 19]
机译：利用低温扫描电子显微镜研究了引起豌豆霜霉病的豌豆Peronospora viciae的无性和有性生殖结构。在被感染的玻璃温室植物暴露于高湿度下4-6小时后，孢子体首先出现在气孔的背面小叶表面。孢子囊细胞在接下来的6小时内继续发育，首先是简单的伸长菌丝，然后从一个单轴（单向地）分支，产生多个末端孢子囊，并在每个孢子囊上同时并多胚发育。孢子囊在发育过程中具有光滑的表面，成熟时细微地细化，并在孢子体末端的末端被隔膜隔开。野豌豆荚的内表面上广泛地生长着配子（小卵子和花药），这是由于粘附在宿主表皮上的光滑球根菌丝所致。每个卵囊都被多个花药所包围。大田植物的荚果组织内的卵孢子被卵膜包裹。每个卵子都有一个非常网状的外壁，包围着细胞质和液体，可能还有脂质。冷冻固定和低温扫描电子显微镜已提供了新的见解，在野豌豆繁殖的形态。 [参考：19]

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