Effects of pH on the comparative culturability of fungi and bacteria from acidic and less acidic forest soils

Journal of Basic Microbiology - Tập 37 Số 5 - Trang 335-343 - 1997
Carola Matthies1, Hans‐Peter Erhard1, Harold L. Drake1
1Lehrstuhl für Okologische Mikrobiologie, BITOK, Universität Bayreuth, 95440 Bayreuth, Germany.

Tóm tắt

AbstractUnder aerobic conditions, the culturable microbial population of acidic forest soils was more tolerant to acidic cultivation conditions than was the culturable microbial population of less acidic soils. The number of culturable bacteria decreased sharply under acidic cultivation conditions, while the number of culturable fungi remained relatively constant over the pH range 2.2–6.5. The ratios of culturable bacteria to culturable fungi were greater than one at pH 6.5; in contrast, the bacteria‐to‐fungi ratios were less than one at pH 2.2–4. At pH's approximating those of the soils examined, culturable fungi predominated the culturable microbial community in acidic soils. However, relative to the populations resolved, acidic forest soils displayed a more acid tolerant bacterial population than did less acidic forest soils. The culturable fungal population contained both filamentous and yeast morphologies. An acid‐tolerant fungal isolate that grew at pH 1 was identified as a subspecies of Penicillium frequentans, and an acid‐tolerant yeast that grew at pH 2 was identified as the yeast stage of the basidiomycetes Ustilago maydis.

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Journal of Basic Microbiology

Tập 37 Số 5

335-343

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