Journal of FARM SCIENCES, Vol 20, No 2 (2007)

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Multiple Beneficial Functions of Fluorescent Pseudomonads of Western Ghats of Uttara Kannada District

Y.J. Megha, A.R. Alagawadi, P.U. Krishnaraj

Abstract


Fifty-two fluorescent pseudomonads isolated from the forest soils of Western Ghats of Uttara Kannada district were tested for various beneficial traits. Out of 44 isolates exhibiting biocontrol activity against four plant pathogens, 14 were inhibitory to Ralstonia solanacearum, 10 to Xanthomonas compestris, 32 to Fusarium oxysporum and 24 to Rhizoctonia bataticola. Twenty-two isolates showed inhibitory activity against multiple pathogens. All the 44 isolates showed HCN production whereas a few isolates tested also showed antimicrobial metabolite production inhibitory to X. campestris,F. oxysporum and R. bataticola, in vitro. All the 52 isolates solubilized tri-calcium phosphate (TCP) and produced IAA and GA. The amount of Pi released from TCP ranged from 1.78 to 15.44 per cent where as the amount of IAA and GA produced ranged from 80 to 760 µg/l and 24.8 to 262.8 µg/l of broth respectively. Forty-seven isolates recorded the alkaline protease activity in the range of 0.50 to 6.18 mg tyrosine/mg protein/hour. The investigation clearly indicated that many fluorescent pseudomonads of Western Ghats possess multiple beneficial functions useful for agriculture and industry.

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