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Journal of Bacteriology, September 1998, p. 4938-4941, Vol. 180, No. 18
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Mutation of an Alternative Sigma Factor in the Cyanobacterium Nostoc punctiforme Results in Increased Infection of Its Symbiotic Plant Partner, Anthoceros punctatus

Elsie Lin Campbell,1 Bianca Brahamsha,2 and John C. Meeks1,*

Section of Microbiology, Division of Biological Sciences, University of California, Davis, California 95616,1 and Marine Biology Research Division, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093-02022

Received 6 February 1998/Accepted 8 July 1998

An alternative group 2 sigma factor was identified in the nitrogen-fixing, symbiotically competent cyanobacterium Nostoc punctiforme and designated sigH. Transcription of sigH was specifically induced within 1.5 h following exposure of N. punctiforme to its symbiotic plant partner, Anthoceros punctatus. A mutation in sigH resulted in a sixfold-higher initial infection of A. punctatus tissue without a parallel increase in nitrogen-fixing activity.

* Corresponding author. Mailing address: Section of Microbiology, Division of Biological Sciences, University of California, One Shields Ave., Davis, CA 95616. Phone: 530-752-3346. Fax: 530-752-9014. E-mail: jcmeeks{at}ucdavis.edu.

Journal of Bacteriology, September 1998, p. 4938-4941, Vol. 180, No. 18
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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