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Microbial populations and phenolic acids in soil |
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| Authors: | Udo Blum and Steven R Shafer |
| Institution: | 1 Department of Botany Agricultural Research Service and Departments of Plant Pathology and Soil Science, North Carolina State University, Raleigh, NC 27695, U.S.A. 2 United States Department of Agriculture, Agricultural Research Service and Departments of Plant Pathology and Soil Science, North Carolina State University, Raleigh, NC 27695, U.S.A. |
| Abstract: | Populations of bacteria, fungi and actinomycetes in Portsmouth A1- and B,-soil material were affected in different ways by repeated enrichment with ferulic, p-coumaric, p-hydroxybenzoic or vanillic acids. Responses varied with type of soil material and phenolic acid, phenolic acid concentration, and inorganic nutrient status of the soil. Populations changed more frequently in B1- than in A1-soil material. Phenolic acids were readily metabolized by microorganisms, sometimes without detectable population changes, when adequate mineral nutrients were present. Induction of enzymes or selection of organisms capable of degrading individual phenolic acids were clearly evident. Results imply that microbial activity in bioassay systems should be defined for allelopathic studies, particularly when results from various bioassay systems are to be compared |
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