Abstract
The diversity and biotechnological potential of the haloalkaliphilic actinomycetes of the saline habitats are explored only in a limited sense. Albeit, they have been reported to produce various enzymes, organic acids, antibiotics, and other secondary metabolites. Therefore, we aimed to investigate marine actinomycetes with respect to their cultivation, morphology, biochemical properties, enzyme secretion, solvent tolerance, antibacterial activities and phylogeny. Further, the composition of cell wall and its sugar constituents and variation in multiple–antibiotic-resistance (MAR) suggested diversity of the actinomycetes of the studied habitats. In total, 20 haloalkaliphilic actinomycetes were identified and studied further. Based on the 16S rRNA gene sequences, most of these actinomycetes belong to the genus Nocardiopsis. However, Hae III restriction patterns of the 16S rRNA genes reveal eight main clusters, corresponding with the Jaccard’s similarity coefficient and phenograms based on the biochemical properties. The Canonical Correlation Analysis suggests that pH and temperature rather than salinity and conductivity of the saline habitat are determinants of the growth of actinomycetes. The polyphasic analysis was highly significant in judging the diversity and taxonomy of the marine actinomycetes. Besides, the evaluated phenetic attributes may help in the exploration of the biotechnological potential of these actinomycetes.
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