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Appl Environ Microbiol. 1989 March; 55(3): 666-671
Copyright © 1989, American Society for Microbiology. All Rights Reserved.

Physiological Characterization of Dicarboxylate-Induced Pleomorphic Forms of Bradyrhizobium japonicum

H. Keith Reding{dagger} and Joe Eugene Lepo{ddagger},*

Department of Biology, The University of Mississippi, University, Mississippi 38677

ABSTRACT

When Bradyrhizobium japonicum I-110 was transferred into medium containing 40 mM succinate or 40 mM fumarate, over 90% of the bacteria acquired a swollen, pleomorphic form similar to that of bacteroids. The induction of pleomorphism was dependent on the carbon substrate and concentration but was independent of the hydrogen ion and sodium ion concentration. Cell extracts of rod-shaped and pleomorphic cells contained enzymes required for sugar catabolism and gluconeogenesis. Variations in these enzyme profiles were correlated with the carbon source used and not with the conversion to the bacteroid-like morphology. Rod-shaped cells cultured on glucose or 10 mM succinate transported glucose and succinate; however, the pleomorphic cells behaved similarly to symbiotic bacteroids in that they lacked the ability to transport glucose and transported succinate at lower rates than did rod-shaped cells.

FOOTNOTES

* Corresponding author.

{dagger} Present address: Department of Microbiology, University of Georgia, Athens, GA 30602.

{ddagger} Present address: ECOGEN Inc., 2005 Cabot Boulevard West, Langhorne, PA 19047-1810.

Appl Environ Microbiol. 1989 March; 55(3): 666-671
Copyright © 1989, American Society for Microbiology. All Rights Reserved.



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Copyright © 1989 by the American Society for Microbiology. All rights reserved.