Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 07, Issue 2, 2005; Page No.(285-288)

ANTAGONISTIC EFFECT OF NEW ISOLATES OF PSEUDOMONAS ON SOME SOIL BORNE FUNGAL PATHOGENS

MEENU SARAP. AND KRISHNA MAHIDA

Abstract

Four isolates of Pseudontonas were isolated from rhiamphere of field crops like Trigondta and Vtgrto Sps. They were further selected on basis of fluorescence under UV light and assessed for theff biocontrol potential. The production of sideruphores in CAS medium was found to be posifive in all strains, maximum being 41 pg/m in case of Pseudothotras aeruginosa Fluorescent Pseudomonas TP-2 produced catevholate type of siderophore in deferrated medium. All the strains were shown to exhibit a wide range of antifungal activity against some phytopathogens like Potashes, ozysporlan and Rhizocionia invitro conditions. However, only 3 of the tested strains could produce bacterimin like substance (131,8).88M8Ithc other related species tested. Analysis of results shows that fluorescent Nam/moms strain TP-2 tested showed maximum antagonism as compared to the known strain of Pseuttornoltas amphora making the organisms potential biocontrol agent against soil borne pathogen. Preadonionas are able to colonize plant roots and compete with native soil rnicroflora better than other inoculated strains (Hebbar et a). 1992). In recent of ion has been paid to p/antinitially selected for bioliN pelt promotion in absen -ear :Pfg. conversely when challenged nu th the pnttI strains exhibit biocontro/ activity. A motabilliteS like bacteriocin

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