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Epiphytic bacterial communities within the sheath material of three filamentous green algae,Desmidium grevillii ,Hyalotheca dissiliens , andSpondylosium pulchrum (class Charophyceae, order Zygnematales), collected from aSphagnum bog were characterized by PCR amplification, cloning, and sequencing of 16S ribosomal DNA. A total of 20 partial sequences and nine different sequence types were obtained, and one sequence type was recovered from the bacterial communities on all three algae. By phylogenetic analysis, the cloned sequences were placed into several major lineages of theBacteria domain: theFlexibacter/Cytophaga/Bacteroides phylum and the α, β, and γ subdivisions of the phylumProteobacteria . Analysis at the subphylum level revealed that the majority of our sequences were not closely affiliated with those of known, cultured taxa, although the estimated evolutionary distances between our sequences and their nearest neighbors were always less than 0.1 (i.e., greater than 90% similar). This result suggests that the majority of sequences obtained in this study represent as yet phenotypically undescribed bacterial species and that the range of bacterial-algal interactions that occur in nature has not yet been fully described.

Molecular Characterization of Epiphytic Bacterial Communities on Charophycean Green Algae