Identification of Actinomycetes in Freshwater Sediments from Mamasa , West Sulawesi and Their Antibacterial and Phosphate Solubilizing Activities

A large number of actinomycetes that have been isolated and screened were obtained from soil and marine samples. Consequently, the possibility of isolating novel Actinomycetes and secondary metabolites compounds strains from soil and marine samples have limited. Exploration of actinomycetes from freshwater sediment is rare. In this study, 30 isolates of Actinomycetes from freshwater sediments in Mamasa District, West Sulawesi were isolated, identified, and screened for their antibacterial and phosphate solubilizing activity. Actinomycetes were isolated by serial dilution method and were identified based on morphological and 16S rRNA gene sequence. Antibiotic activity was screened using the agar plug diffusion method, while soluble phosphate ability was observed by clear zone ratio in PKA medium. Most of the isolates belong to the genus Streptomyces (80%). Out of 30 isolates, 56.6% showed antibacterial activity and 36.6% had potential as solubilizing phosphate which belong to genus Streptomyces, Actinomadura, and Kitasatospora.