Effect of oxygen concentration on acetylene reducing activity of nitrogen-fixing bacteria isolated from rice roots

概要

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The presence of oxygen may affect the nitrogenase activity of nitrogen-fixing bacteria. The effect of oxygen concentration on the acetylene reducing activity (ARA) of nitrogen-fixing bacteria Enterobacter, Azospirillum, Pseudomonas, Xanthobacter and Alcaligenes associated with rice roots cultivated in paddy soils in Japan was investigated. The following results were obtained : 1) The oxygen concentration inducing maximum nitrogenase activity was 2.0, 2.0, 0.8, 0.3, and 1.0 KPa for Enterobacter, Azospirillum, Pseudomonas, Xanthobacter and Alcaligenes, respectively. 2) Nitrogenase activity was not limited at 5.0 KPaO_2 for Enterobacter and Azospirillum, but limited at 5.0 KPaO_2 for Pseudomonas, Xanthobacter and Alcaligenes. In the complete anaerobic condition, the nitrogenase activity was not detected in any of the bacterial strains used in this study. 3) Enterobacter, Azospirillum and Xanthobacter showed a broad spectrum for the effect of oxygen on the nitrogenase activity, while Pseudomonas and Alcaligenes showed a narrow spectrum.
日本土壌微生物学会の論文
1989-11-01