Advances in Earth Science ›› 2006, Vol. 21 ›› Issue (10): 1058-1062. doi: 10.11867/j.issn.1001-8166.2006.10.1058

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A Preliminary Study on the Diversity of Bacteria in the Xisha Trough Sediment, the South China Sea

Li Tao,Wang Peng,Wang Pinxian   

  1. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
  • Received:2006-02-27 Revised:2006-08-20 Online:2006-10-15 Published:2006-10-15

Li Tao,Wang Peng,Wang Pinxian. A Preliminary Study on the Diversity of Bacteria in the Xisha Trough Sediment, the South China Sea[J]. Advances in Earth Science, 2006, 21(10): 1058-1062.

The bulk DNA was isolated from bacterial habits in sediments of the Xisha trough, the south China sea. Using a pair of primers special for most common bacteria, the researchers amplified partial sequences of bacterial 16S rDNA gene and thus constructed a 16S rDNA clone library. A total of 22 clones were used to reconstruct the bacterial 16S rDNA phylogenetic tree. Guided by the phylogenetic tree, bacteria fell into four main lineages: Proteobacteria, Planctomycene, Actinabacteria and Low G+C Gram-positive bacterium. Among them, 49% belonged to Proteobacteria, 22% to Planctomycene,the same to Low G+C Gram-positive bacterium,and the remaining 7% to Planctomycene. The group of Proteobacteria clustered in three subgroups: α-, γ- and δ-Proteobacteria, and the subgroup of δ-Proteobacteria predominated in them. Furthermore, the abundance of two groups of Planctomycene and Low G+C Gram-positive bacterium, living commonly in shallow marine deposits, was higher in sediments of the Xisha Trough than in other deep-sea sediments. Most members of these two groups were probably brought from the shelf into the trough sediment by the turbid.

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