Psychrotolerant antifungal Streptomyces isolated from Tawang, India and the shift in chitinase gene family

Springer Science and Business Media LLC - Tập 17 - Trang 1045-1059 - 2013
Rajal Debnath1, Ratul Saikia1, Rupak K. Sarma1, Archana Yadav1, Tarun C. Bora1, Pratap J. Handique2
1Biotechnology Division, CSIR-North East Institute of Science and Technology (CSIR-NEIST), Jorhat, India
2Department of Biotechnology, Gauhati University, Guwahati, India

Tóm tắt

A total of 210 Streptomyces were isolated from the soil samples of Tawang, India where temperature varied from 5 °C during daytime to −2 °C during the night. Based on antifungal activity, a total of 33 strains, putatively Streptomyces spp., were selected. Optimal growth temperature for the 33 strains was 16 °C, with growth occurring down to 6 °C but not above 30 °C. Phylogenetic analysis based on 16S rDNA sequences revealed the taxonomic affiliation of the 33 strains as species of Streptomyces. To examine the relatedness of the chitinase genes from six strong antifungal Streptomyces strains, a phylogenetic tree was constructed using the catalytic domain nucleotide sequences and resulted in seven distinct monophyletic groups. A quantitative PCR study for chitinase expressing ability revealed that of the six antifungal strains tested, the strain Streptomyces roseochromogenus TSR12 was the most active producer of family 18 chitinase genes. Streptomyces strains with enhanced inhibitory potential usually encode a family 19 chitinase gene; however, our present study did not show expression of this family in the six strains tested.

Tài liệu tham khảo

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