Oxalate-metabolizing microorganisms in sagebrush steppe soil |
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Authors: | Sherri J. Morris Michael F. Allen |
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Affiliation: | (1) Department of Biology, San Diego State University, 92182-0057 San Diego, CA, USA;(2) Present address: Department of Plant Biology, The Ohio State University, 1735 Neil Avenue, 43210 Columbus, OH, USA |
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Abstract: | Oxalate metabolization by soil microorganisms was assessed using a calcium oxalate clearing medium and14CO2 release from [14C]-oxalate. Three saprophytic fungi, two bacteria, and one actinomycete tested produced14CO2 when grown in culture with [14C]-oxalate, yet failed to test positive for oxalate degradation using a calcium-clearing medium. A field plot was then established to determine the effects of oxalate inputs on oxalate metabolism. The amount of [14C]-oxalate metabolized by soil microorganisms and the number of bacteria metabolizing oxalate increased within 24 h after the addition of oxalic acid at a concentration of 11.1 mol g-1 soil. Oxalate metabolism and bacterial numbers returned to the baseline within 84 days. Soil phosphate concentrations increased significantly above baseline 7 days after the addition of oxalate and did not return to prespike levels. Fungi, bacteria, and actinomycetes were able to metabolize oxalate. Therefore, while oxalate can influence P cycles by increasing the amount of available phosphates, that increase is mediated by microbes that metabolize the oxalates. |
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Keywords: | Oxalate metabolization Calcium oxalate Phosphorus cycling Fungi Bacteria Actinomycetes |
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