土壤中に於ける放線菌の分布(第2報) : 新放線菌Microbispora

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A strain of actinomycetes isolated from soil in Yamanashi Pref. showed the charactrers representing an underscribed genus of Streptomycetaceae. As the conidial phase of this strain offers the distinguishing character in determining the genera of Streptomycetaceae, it is proposed to present the strain under study as a new genus.Microbispora gen. nov.The genus Microbipora is characterized by the conidia produced in pairs on the aerial hyphae. The conidiophores may be short that conidia appear to be produced directly on the mycelium. The aerial mycelium forms a bud at the side, and later the bud, or occasionally the tip of side branch, swells and is separated by a cross wall giving rise to two spherical or oval conidia (1.4〜1.6μ in diameter).The germination of conidia and the structure of vegetative mycelium are similar to those of Streptomyces.Description of Microbispora rosea sp. nov.Vegetatite growth : Slow growth on various nutrient agar. Color of cultures pale pink on EMERSON's agar (EA), or coral orange changing to chestnut-brown on carrot agar. Diffusible pigment very slight. The streak cultures convex, folded or lichenoid. The dominant form of this organism on EA after 14 days at 30℃ may be chlamydospores.Aerial growth : white, powderly, with tendency to form fairy rings on some media.Spherical or short oval conidia, produced in pairs on very short conidiophores or entirely sessile.Aerial mycelium and conidia are well produced on the agar media such as 5-times-diluted EA plus B-vitamins and Fe-ion.Milk : No coagulation and no peptonization.Gelatin liquefaction : Negative.Thermal death point : 55℃, 10 min. (vegetative), 65℃, 10 min. (conidia) Starch hydrolysis : Negative.Sucrose : No inversion. Optimum pH : 6.0〜7.0 Reduction of nitrate : Reduction to nitrite. Antagonistic property : None.Remarks : Thiamine and biotin are essential for the growth; biotin also controls pig-mentation. Ammonium compounds, nitrates, and urea are not utilized as a source of nitrogen; growing on asparagine, glutamic acid or peptone medium.Potassium phosphates inhibit the growth at 0.5 per cent in the media, unfavor at 0.1〜0.05 per cent, and favor at lower levels than 0.01 per cent.Cu-jon is injurous even at 2〜3 ppm levels. Fe-ion promotes the vegetative and aerial growth and the darkening of colonies and media.Source : Soil.
社団法人日本生物工学会の論文
1957-08-15

土壤中に於ける放線菌の分布(第2報) : 新放線菌Microbispora

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