2001 Volume 16 Issue 1 Pages 59-62
The sequences of small subunit ribosomal RNA gene (SSU rDNA) and pigment composition were examined for the five filamentous bacteria isolated from the unialgal cultures of marine microalgae Chattonella marina, Heterosigma akashiwo, or Tetraselmis sp. The SSU rDNA data suggested that the filamentous bacteria were clustered into the same species, which belonged to the Roseobacter group in α-proteobacteria. Sequence similarities of SSU rDNA to each of the other strains were more than 99%. The strains possessed bacteriochlorophyll a, but were different in carotenoid composition: four of the strains contained a carotenoid that was similar to spheroidenone but the other one did not.