ACTINOMYCETE FLORA OF TROPICAL UPLAND FARM SOILS ON THE BASIS OF GENUS COMPOSITION AND ANTAGONISTIC PROPERTY
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概要
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The genus composition and antibiotic production of actinomycete isolates (1,240), sampled from major great soil groups of tropical upland farm soils in Thailand were investigated. 75.4% of total isolates belonged to Streptomyces followed by Nocardia (4.8%), Streptosporangium (3.2%) and Micromonospora (1.5%). Actinomycetes without aerial mycelium (not identified group) accounted to 13.0% of all isolates. A high percentage of Streptomyces and a low one of actinomycetes without aerial mycelium were found. Spiral forms of Streptomyces were more abundant in the soils of Thailand (38.8%) than in the soils of Japan (11.5%). The composition of actinomycete flora in the soils of Thailand, as a whole, was found to be different from that of Japan. The genus composition of actinomycete flora varied among great soil groups. It was conspicuous that Grumusols with high maximum water-holding capacity contained a fairly high percentage of Micromonospora (17%), which was generally found in soils with high moisture content such as paddy and peat soils. Rendzinas and Gray Podzolic Soils showed a rather higher percentage of Nocardia (13 to 14%). Percentage of actinomycetes antagonistic to Rhizoctonia solani and four test organisms of Gram-positive bacteria were significantly higher in tropical soils than in Japanese soils. Percentage of actinomycetes antagonistic to each test organism showed variations among great soil groups. The soils with high percentage of actinomycetes antagonistic to Gramnegative bacteria were significantly high in maximum water-holding capacity and organic matter content. And furthermore soils with high percentage of actinomycetes antagonistic to Gram-negative bacteria such as Brown Forest Soils, Rendzinas and Grumusols showed higher population of Gram-negative bacteria, higher ratios of population of Gram-negative bacteria to Gram-positive ones, and also higher rations of Gram-negartve bacteria to actinomycetes than soils with low percentages of them.
- 一般社団法人日本土壌肥料学会の論文
- 1979-12-00
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関連論文
- MICROFLORA RELATED TO THE NITROGEN CYCLE IN THE TROPICAL UPLAND FARM SOILS
- MICROFLORA RELATED TO THE NITROGEN CYCLE IN THE TROPICAL PADDY SOILS
- COMPARISON OF ACTINOMYCETE FLORA BETWEEN TROPICAL AND TEMPERATE UPLAND FARM SOILS : 1. Physiological Characteristics
- EFFECT OF RICE STRAW ON THE COMPOSITION OF VOLATILE SOIL GAS AND MICROFLORA IN THE TROPICAL PADDY FIELD
- ACTINOMYCETE FLORA OF TROPICAL UPLAND FARM SOILS ON THE BASIS OF GENUS COMPOSITION AND ANTAGONISTIC PROPERTY