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Bacterial Community Structure and Diversity Using 16S rDNA Analysis in the Intertidal Sediment of Ganghwa Island  

Cho Hye Youn (한국해양연구원 해양생물자원연구본부, 인하대학교 해양학과)
Lee Jung-Hyun (한국해양연구원 해양생물자원연구본부)
Hyun Jung-Ho (한국해양연구원 해양생물자원연구본부)
Publication Information
Korean Journal of Microbiology / v.40, no.3, 2004 , pp. 189-198 More about this Journal
Abstract
T-RFLP analysis and clone sequencing analysis based on bacterial 16S rDNA were conducted to assess bacterial community structure and diversity in two layers (0-1cm, 6-7cm depth) of the sediment from Janghwari intertidal flat in Ganghwa Island. The results of T-RFLP (terminal-restriction fragment length polymorphism) analysis using restriction enzyme HhaI showed that the T-RFs of various size ($60{\pm}2$) bp-($667{\pm}2$) bp) appeared evenly at the surface sediments but two T-RFs with 60(${\pm}2$)bp and 93 (${\pm}2$)bp predominated at 6-7cm depth. Analysis of partial sequences for 172 clones revealed that 98% of the clones were not matched with the sequences of cultured bacteria strains in the GenBank (${\geq}similarity$ 98%), and approximately 86% of them were classified as different phylotypes. Most clones belonged to $\alpha$-, $\gamma$-, and $\delta$-Proteobacteria, Acidobacteria/Holophaga and green nonsulfur bacteria group. Proteobacteria group occupied the highest proportion in both layers (69% at 0-1cm depth and 46% at 6-7cm depth). $\gamma$-Proteobacteria and $\delta$-Proteobacteria that are associated with oxidation and reduction of sulfur compounds were appeared to be dominant, and comprised 21.5% and 15.7% of total clones, respectively. Overall results indicated that extremely diverse bacterial groups were inhabiting in the sediment of Ganghwa intertidal flat, and bacterial communities associated with the behaviour of sulfur seemed to playa significant role in the biogeochemical environment in this anoxic sediment.
Keywords
bacterial diversity; Ganghwa; intertidal flat; microbial community structure; t-RFLP;
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