Aerobic nitrogen fixation by the marine non-heterocystous cyanobacterium Trichodesmium (Oscillatoria) spp.: Its protective mechanism against oxygen |
| |
Authors: | T Saino A Hattori |
| |
Institution: | (1) Ocean Research Institute, University of Tokyo, 1-15-1 Minami dai, Nakano ku, 164 Tokyo, Japan |
| |
Abstract: | Nitrogen fixation (acetylene reduction) by the marine non-heterocystous cyanobacteria, Trichodesmium thiebautii and T. erythraeum, is sensitive to oxygen. Its sensitivity to oxygen was intensified when the colonies of T. thiebautii were disintegrated, but the separate trichomes yielded still retained the capacity for light dependent acetylene reduction. Trichodesmium colonies evolved hydrogen under argon in the light. The addition of carbon monoxide with DCMU 3-(3,4-dichlorophenyl)-1,1-dimethylurea] enhanced the rate of hydrogen evolution to approximately the same level as that of the maximum acetylene reduction on an electron basis. This probably results from the inhibition of the uptake hydrogenase. We propose that the uptake hydrogenase functions to protect nitrogenase from damage by oxygen. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|