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Appl. Environ. Microbiol., Feb 1996, 461-468, Vol 62, No. 2
M Ohkuma and T Kudo
The phylogenetic diversity of the intestinal microflora of a lower termite,
Reticulitermes speratus, was examined by a strategy which does not rely on
cultivation of the resident microorganisms. Small-subunit rRNA genes (16S
rDNAs) were directly amplified from the mixed- population DNA of the
termite gut by the PCR and were clonally isolated. Analysis of partial 16S
rDNA sequences showed the existence of well-characterized genera as well as
the presence of bacterial species for which no 16S rDNA sequence data are
available. Of 55 clones sequenced, 45 were phylogenetically affiliated with
four of the major groups of the domain Bacteria: the Proteobacteria, the
spirochete group, the Bacteroides group, and the low-G+C-content
gram-positive bacteria. Within the Proteobacteria, the 16S rDNA clones
showed a close relationship to those of cultivated species of enteric
bacteria and sulfate-reducing bacteria, while the 16S rDNA clones in the
remaining three groups showed only distant relationships to those of known
organisms in these groups. Of the remaining 10 clones, among which 8 clones
formed a cluster, there was only very low sequence similarity to known 16S
rRNA sequences. None of these clones were affiliated with any of the major
groups within the domain Bacteria. The 16S rDNA gene sequence data show
that the majority of the intestinal microflora of R. speratus consists of
new, uncultured species previously unknown to microbiologists.
Copyright © 1996, American Society for Microbiology
Phylogenetic diversity of the intestinal bacterial community in the termite Reticulitermes speratus
Institute of Physical and Chemical Research (RIKEN), Saitama, Japan. mohkuma@postman.riken.go.jp
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