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Plant Physiology 71:194-196 (1983) © 1983 American Society of Plant Biologists Cytochromes of Rhizobium japonicum 61A76 Bacteroids from Soybean Nodules 1Charles F. Kettering Research Laboratory, Yellow Springs, Ohio 45387
Bacteroids of Rhizobium japonicum 61A76 were isolated from nodules of field-grown soybean plants by sucrose density gradient fractionation. The major cytochromes, aa3, b, c, and possibly o were present in the bacteroids throughout the active nitrogen-fixing life of the nodule. This is in contrast with previous reports using other R. japonicum strains in which cyotchromes aa3 and o were not found.
2 Present address: Woman's College, Ain Shams University, Heliopolis, Cairo, Egypt. 1 Supported in part by the United States Department of Agriculture under agreement No. 59-2394-1-653-0. Contribution No. 785 from this laboratory.
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