Antibacterial activity of endophytic bacteria isolated from few medicinal plants of BR hills, Karnataka

Abstract

Endophytes are the microorganisms that live inside the plant host without causing any apparent diseases to the host plant and have known to produce various novel bioactive compounds. Medicinal plants have been collected from Biligirirangana Hill (BR Hill), Chamarajanagar district, Karnataka. In the present study the leaves were isolated in triplicates to evaluate the antibacterial activity of endophytic bacteria. A total of 90 bacterial isolates were obtained from 30 medicinal plants. These isolates were subjected to assess their antibacterial activity against S. aureus, E. coli, B. subtilis, P. aeruginosa, Shigella sp, K. pneumoniae, P. mirabilis and L. monocytogenes. Few isolates showed the antibacterial activity by showing the clear zone of inhibition against few human pathogens, out of which 5 isolates exhibited a contrasting antibacterial activity with the presence of highest zone of inhibition against all the test pathogens.