Effects of nitrite toxicity on soil bacteria under aerobic and anaerobic conditions |
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Authors: | Jean-Marc Bollag Nancy M Henninger |
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Institution: | Laboratory of Soil Microbiology, Department of Agronomy, The Pennsylvania State University, University Park, PA 16802, U.S.A. |
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Abstract: | Isolates of a soil Pseudoimonas, as well as other soil bacteria, showed a different sensitivity towards NO?2 when grown under aerobic or anaerobic conditions. The tolerance to NO?2 was increased in the presence of O2: for instance, a concentration of of NO?2-N proved to be toxic to a Pseudomonas sp. under anaerobic conditions, whereas over were needed aerobically to suppress its growth completely. The addition of NO?3 as an electron acceptor for anaerobic respiration did not overcome the inhibitive effect of NO?3. The pH range, at which NO?2 was utilized anaerobically, was narrowed with increasing NO?2 concentration (pH 6.8–8.8 at of NO?2-N and 7.4–8.5 and of NO?2-N).Tolerance to nitrite varied considerably among the bacteria tested. Each species was able to overcome the inhibitory effect of NO?2 up to a certain concentration, while the length of the lag phase was related to NO?2 concentration. |
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