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Journal of Bacteriology, April 2000, p. 2230-2237, Vol. 182, No. 8
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Genetic and Biochemical Characterization of the Pathway in Pantoea citrea Leading to Pink Disease of Pineapple

Catherine J. Pujoldagger and Clarence I. Kado*

Department of Plant Pathology, University of California, Davis, California 95616

Received 15 September 1999/Accepted 30 December 1999

Pink disease of pineapple, caused by Pantoea citrea, is characterized by a dark coloration on fruit slices after autoclaving. This coloration is initiated by the oxidation of glucose to gluconate, which is followed by further oxidation of gluconate to as yet unknown chromogenic compounds. To elucidate the biochemical pathway leading to pink disease, we generated six coloration-defective mutants of P. citrea that were still able to oxidize glucose into gluconate. Three mutants were found to be affected in genes involved in the biogenesis of c-type cytochromes, which are known for their role as specific electron acceptors linked to dehydrogenase activities. Three additional mutants were affected in different genes within an operon that probably encodes a 2-ketogluconate dehydrogenase protein. These six mutants were found to be unable to oxidize gluconate or 2-ketogluconate, resulting in an inability to produce the compound 2,5-diketogluconate (2,5-DKG). Thus, the production of 2,5-DKG by P. citrea appears to be responsible for the dark color characteristic of the pink disease of pineapple.

* Corresponding author. Mailing address: Department of Plant Pathology, University of California, One Shields Avenue, Davis, CA 95616. Phone: (530) 752-0325. Fax: (530) 752-5674. E-mail: cikado{at}ucdavis.edu.

dagger Present address: Plant and Microbial Biology Department, University of California, Berkeley, CA 94720-3102.

Journal of Bacteriology, April 2000, p. 2230-2237, Vol. 182, No. 8
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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