Culture independent molecular analysis of bacterial communities in the mangrove sediment of Sundarban, India.
BACKGROUND
Sundarban is the world's largest coastal sediment comprising of mangrove forest which covers about one million hectares in the south-eastern parts of India and southern parts of Bangladesh. The microbial diversity in this sediment is largely unknown till date. In the present study an attempt has been made to understand the microbial diversity in this sediment using a cultivation-independent molecular approach.


RESULTS
Two 16 S rRNA gene libraries were constructed and partial sequencing of the selected clones was carried out to identify bacterial strains present in the sediment. Phylogenetic analysis of partially sequenced 16 S rRNA gene sequences revealed the diversity of bacterial strains in the Sundarban sediment. At least 8 different bacterial phyla were detected. The major divisions of detected bacterial phyla were Proteobacteria (alpha, beta, gamma, and delta), Flexibacteria (CFB group), Actinobacteria, Acidobacteria, Chloroflexi, Firmicutes, Planctomycetes and Gammatimonadates.


CONCLUSIONS
The gammaproteobacteria were found to be the most abundant bacterial group in Sundarban sediment. Many clones showed similarity with previously reported bacterial lineages recovered from various marine sediments. The present study indicates a probable hydrocarbon and oil contamination in this sediment. In the present study, a number of clones were identified that have shown similarity with bacterial clones or isolates responsible for the maintenance of the S-cycle in the saline environment.
Ghosh
Abhrajyoti
A
Department of Biochemistry and Department of Biotechnology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata- 700019, West Bengal, India.|Current address: Max Planck Research Group "Molecular Biology of Archaea", Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Strasse, D-35043 Marburg, Germany.
Dey
Nirmalya
N
Department of Biochemistry and Department of Biotechnology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata- 700019, West Bengal, India.|Current address: Division of Nephrology Department of Medicine, 7703 Floyd Curl Drive, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229 3900, USA.
Bera
Amit
A
Department of Biochemistry and Department of Biotechnology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata- 700019, West Bengal, India.
Tiwari
Amit
A
Department of Biochemistry and Department of Biotechnology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata- 700019, West Bengal, India.|Current address: Institute of Molecular Cancer Research, University of Zurich, 17 K 28, Winterthurerstrasse 190, Zurich-8057, Switzerland.
Sathyaniranjan
K B
KB
Department of Biochemistry and Department of Biotechnology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata- 700019, West Bengal, India.
Chakrabarti
Kalyan
K
Department of Agricultural Chemistry & Soil Science, Institute of Agricultural Science, University of Calcutta, 35, Ballygunge Circular Road. Kolkata- 700019, West Bengal, India.
Chattopadhyay
Dhrubajyoti
D
Department of Biochemistry and Department of Biotechnology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata- 700019, West Bengal, India.