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The present study emphasizes the diversity assessment of marine  Bacillus  species with special reference to biosurfactant production, respective gene expression, and discrimination among  Bacillus licheniformis  and  Bacillus subtilis . Among the 200 individual species of eastern coastal plain of Tamil Nadu screened, five biosurfactant producing potential bacterial species with entirely different morphology were selected. Biochemical and 16S rRNA gene sequence analysis suggested that all the said five species belong to  Bacillus  genera but differ in species levels. Biosurfactant of all the five species fluctuates in greater levels with respect to activity as well as to constituents but showed partial similarity to the commercially available surfactin. The expression of  srf  gene was realized in all of the five species. However, the  sfp  gene expression was observed only in three species. In conclusion, both  B. licheniformis  and  B. subtilis  demonstrate  srf  gene; nevertheless,  sfp  gene was expressed only by  Bacillus subtilis .

Phylogenetic Framework and Biosurfactant Gene Expression Analysis of Marine Bacillus spp. of Eastern Coastal Plain of Tamil Nadu