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Plant Physiology 70:1667-1672 (1982) © 1982 American Society of Plant Biologists Spectral Evidence for a Component Involved in Hydrogen Metabolism of Soybean Nodule Bacteroids 1Laboratory for Nitrogen Fixation Research, Oregon State University, Corvallis, Oregon 97331
A component with a difference spectrum similar to that of b-type cytochromes which becomes reduced upon the addition of H2 has been demonstrated in soybean nodule bacteroids. This electron carrier, referred to as component 559-H2, is present in hydrogenase-positive strains of Rhizobium japonicum but has not been detected in mutants that lack hydrogenase activity or in hydrogenase-negative wild-type strains. A positive correlation between concentrations of component 559-H2 and hydrogenase activities has been established. These results provide further evidence that component 559-H2 is involved in H2 metabolism in R. japonicum.
2 Supported by the Deutsche Forschungsgemeinschaft in the form of a post-doctoral scholarship. 1 Supported by a National Science Foundation grant PCM 81-18148; by a United States Department of Agriculture, Science and Education Administration CRGO grant 78-49-2411-0-1-099-1; by a National Institute of Health Biomedical Research Support grant RR07079; and the Oregon Agricultural Experiment Station from which this is Technical Paper No. 6413.
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