Nitrogen fixation in cultured cowpea Rhizobia: inhibition and regulation of nitrogenase activity. |
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Authors: | W R Scowcroft A H Gibson J D Pagan |
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Affiliation: | Division of Plant Industry, CSIRO, Canberra City, A.C.T. 2601 Australia |
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Abstract: | Nitrogenase activity in agar cultures of cowpea rhizobia, strain 32H1, was rapidly inhibited by but this was relieved by increased O2 tension. Inhibition was more rapid than that caused by inhibitors of protein synthesis and was not relieved by methionine sulfoximine or methionine sulfone. Under conditions were nitrogenase activity was inhibited by , glutamine synthetase and glutamate synthase were substantially unaffected. Glutamate dehydrogenase was undetected in either nitrogenase active or inhibited cultures. These results indicate that inhibition of nitrogenase activity in strain 32H1 is not effected through glutamine synthetase regulation of nitrogenase synthesis. |
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