ANTIMICROBIAL ACTIVITY OF SELECTED INDIAN MEDICINAL PLANTSCH. MURAL MOHAN, M. SUDARSANA RAO AND K. PRAMEELA
Seven plants used in traditional Indian Ayurvadic system were screened for potential antimicrobial activity. Antimicrobial activity was evaluated by using aqueous crude extracts. The plants screened were Hibiscus rosa-sinensis, Trigonella foenuni-graecum, Brassica nigra, Eucalyptus globules, Catheranthus roseus, Nicotiana tabacum, Ricinus communis. The antimicrobial activity was tested against three bacterial strains and three fungal strains. The bacterial strains Klebsiella pneumoniae, Bacillus subtilis, Proteus vulgaris and fungal strains Candida aibi cans, Aspergillus niger and an insect pathogen Beauvaria bassiana were used in the present investigation. Agar ditch diffusion method was used to study the antimicrobial activity of all these plants. Aspergillus niger was found resistant to all plant extracts and Candid(' albicans was resistant to most of plant extracts. Klebsiella pneumoniae was inhibited by all the screened plant extracts. Brassica mgra extract was least effective against tested microorganisms. The changes in morphological and biochemical characters of microbes in presence of plant extracts were studied. Results of the antimicrobial activity of selected plant extracts against pathogenic microorganisms showed remarkable activity.
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