Affiliation:
1. Department of Plant Pathology, University of California, Davis, California 95616
Abstract
ABSTRACT
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.
Publisher
American Society for Microbiology
Subject
Molecular Biology,Microbiology
Cited by
44 articles.
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