Journal
ARCHIVES OF MICROBIOLOGY
Volume 175, Issue 4, Pages 259-262Publisher
SPRINGER-VERLAG
DOI: 10.1007/s002030000243
Keywords
flavobacteria; Chryseobacterium; flexirubin; fumarate respiration; gut; American cockroach
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16S rDNA sequence cloned directly from whole-gut microbiota of the American cockroach, Periplaneta americana, indicated the presence of a member of the Bacteroides/Flavobacterium group most closely related to the genus Flavobacterium. In an attempt to confirm this finding, we isolated a yellow-pigmented bacterium (strain FR2) from the hindgut of this insect. Strain FR2 was phylogentically and phenotypically most similar to species of Flavobacterium and related bacteria, namely Chryseobacterium indologenes. Fifty-four other yellow-pigmented bacteria isolated during a 1-year study shared the salient phenotypic characteristics of Chryseobacterium spp., and thus were considered the same phenotype. This phenotype's abundance was related to the fiber content of the insect diet, being consistently detected only in cockroaches fed a high-fiber diet (30% crude fiber by weight). The highest population density was in the hindgut, ranging from 2x10(6) to 1.2x10(7) colony forming units ml(-1) during a 1-year period. The nature of the symbiosis between the FR2 phenotype and P. americana is discussed.
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