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Comparative Analysis of the Community of Culturable Bacteria Associated with Sponges, Spirastrella abata and Spirastrella panis by 16S rDNA-RFLP  

Cho, Hyun-Hee (Department of Biotechnology, Hannam University)
Park, Jin-Sook (Department of Biotechnology, Hannam University)
Publication Information
Korean Journal of Microbiology / v.45, no.2, 2009 , pp. 155-162 More about this Journal
Abstract
A cultivation-based approach was employed to compare the culturable bacterial diversity associated with two phylogenetically closely related marine sponges, Spirastrella abata and Spirastrella panis, which have geologically overlapping distribution patterns. The bacteria associated with sponge were cultivated using MA medium supplemented with 3% sponge extracts. Community structures of the culturable bacteria of the two sponge species were analyzed with PCR-RFLP (restriction fragment length polymorphism) based on 16S rDNA sequences. The RFLP fingerprinting of 16S rDNA digested with HaeIII and MspI, revealed 24 independent RFLP types, in which 1-5 representative strains from each type were partially sequenced. The sequence analysis showed >98.4% similarity to known bacterial species in public databases. Overall, the microbial populations of two sponges investigated were found to be the members of the classes; Alphaproteobacteria, Gammaproteobacteria, Firmicutes, and Actinobacteria. The Alphaproteobacteria were predominant in the bacterial communities of the two sponges. Gammaproteobacteria represented 38.5% of bacterial community in S. abata. Whereas only 1.6% of this class was present in S. panis. Bacillus species were dominat in S. panis. Bacillus species were found to be 44.3% of bacterial species in S. panis, while they were only 9.7% in S. abata. It is interesting to note that Planococcus maritimus (8.1%, phylum Firmicutes) and Psychrobacter nivimaris (28.9%, phylum Gammaproteobacteria) were found only in S. abata. This result revealed that profiles of bacterial communities from the sponges with a close phylogenetic relationship were highly species-specific.
Keywords
16S rDNA; community; culturable bacteria; marine sponge; RFLP; Spirastrella; sponge-associated bacteria;
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