Diversity and bioactivities of culturable marine actinobacteria isolated from mangrove sediment in Indian Ocean

Abstract:

Abstract:［Objective］In order to explore the diversity，antimicrobial activity and enzyme-producing activity of marine actinobacteria isolated from mangrove sediments in Indian Ocean． ［Methods］Eight sediments collected from mangrove sediments in Indian Ocean were treated by the plate dilution method and spread on 24 isolation media only containing sole carbon source for energy． Marine actinobacteria were isolated and identified by 16S rRNA gene sequence analysis． The antimicrobial activity and enzyme-producing activity of isolated strains were further detected by spot planting method ［Results］In total 139 representative strains were selected from 521 isolates，and they were further sequenced and performed phylogenetic analysis based on their 16S rRNA gene sequences． There were 35 strains identified as potential novel species． Antimicrobial activity was detected in Bacillus subtilis，Candida albicans，Escherichia coli，Staphylococcus aureus，Aspergillus niger． Enzyme-producing activity for protease cellulase，amylase and esterase were 36.5%，26.5%，22.4% and 15.9%，respectively．［Conclusion］Diverse marine actinobacteria were discovered in mangrove sediment in Indian Ocean，which have antimicrobial and enzyme activity．