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Plant Physiology 62:526-530 (1978)
© 1978 American Society of Plant Biologists

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Articles

Development of Bacteroids in Alfalfa (Medicago sativa) Nodules

Alan S. Paau and Joe R. Cowles

Dan Raveed1

Department of Biology, University of Houston, Houston, Texas 77004, Charles F. Kettering Research Laboratory, 150 East South College Street, Yellow Springs, Ohio 45387

The morphology, acetylene reduction capability, and nucleic acid content of bacteroids in different regions of alfalfa (Medicago sativa var. Buffalo) nodules were studied by electron microscopy, gas chromatography, and laser flow microfluorometry, respectively. Bacteroids in the nodule tips were small (1 to 2.5 micrometers in length), had low nucleic acid content, and contained distinct central nucleoids. These bacteroids were comparatively inactive in acetylene reduction in situ. Bacteroids in the middle regions of alfalfa nodules were greatly enlarged (5 to 7 micrometers in length), had relatively high nucleic acid content, and did not possess central nucleoids. The bacteroids were very active in acetylene reduction. Bacteroids in the basal nodule region also were enlarged and without distinct nucleoid regions, but had relatively low nucleic acid content and low in situ acetylene-reducing activity.

1 Present address: Department of Pathology, Indiana University School of Medicine, 1100 W. Michigan St., Indianapolis, Indiana 46206.




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Copyright © 1978 by the American Society of Plant Biologists