メロンがんしゅ病病原放線菌の培地上における形態形成

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Morphogenesis of the pathogenic Streptomyces sp. causing root tumor of melon was characterized with growing process from spore germination to sporulation and pseudosporangium formation on the yeast-starch agar medium under optical and scanning electron microscope observation. Spores did not germinate within 1 hr incubation, and then just a few spores were beginning to germinate with 3 hr incubation at 28℃. Most of spores germinated after 24 hr incubation, but there were remained ungerminated ones. Especial changes of spore surface structure were not observed during germination except that the spores had swollen until 3 hr incubation. Germ tube (hypha) appeared from 1-3 points of a spore surface. Branched multiplying hyphae formed colonies of substratal mycelia after 24-48 hr incubation. Besides growing hyphal tips of these mycelia were become swelling, and produced hook-shaped aerial hyphae on the colonies. The aerial hyphae were more swelled and formed itself into hook or open-loop shapes at 72 hr incubation. Ripening aerial mycelia developed into not only spore chains by formation of septa but also pseudosporangia consisting of spore chains from 72 hr to 5 days after incubation. Morphology of the spore chains indicated that it belonged to type of retinaculum-apertum. Then these colonies had been increasing number of pseudosporangia and decreasing number of spore chains with the incubation time. Pseudosporangia covered with mucoid-like substances were recognized in matured ones after 10 days incubation. For 14-21 days incubation, these colonies had been maintaining the condition that could be observed pseudosporangia, spore masses and spore chains on the substratal mycelial mats overspread with mucoid-like substances.
日本植物病理学会の論文
1994-08-25

メロンがんしゅ病病原放線菌の培地上における形態形成

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