CHARACTERIZATION OF PHOSPHATE SOLUBILIZING RHIZOBACTERIA AND ENDORHIZOBACTERIA FROM MEDICINAL PLANT (PICRORHIZA KURROA) AND THEIR EVALUATION AS ANTIFUNGAL AGENTS
Journal Title: International Journal of Agricultural Science and Research (IJASR) - Year 2017, Vol 7, Issue 2
Abstract
Phosphate solubilizing microorganisms play an important role in supplementing phosphorus to the plants by several mechanisms like lowering of pH by acid production and ion chelation and thus benefit plant growth and development. Therefore, the aim of this study was to determine the phosphate solubilizing potential of plant growth promoting rhizobacteria (PGPR) isolated from Picrorhiza kurroa and evaluate these isolates for their antifungal activity. Forty bacterial isolates were selected as the representative of the total plated population from the rhizosphere soil and rhizome/roots of the Picrorhiza kurroa from two locations of Chamba district. Four phosphate solubilizing bacterial isolates exhibited very good production of chitinase enzyme with a zone size of 30-45mm.Maximum IAA production of 30.00µg/ml was exhibited by PkR(34)* and PkR(7b)*. The isolate Pk12 (b) produced maximum per cent siderophore unit (27.21 %). All the bacterial isolates were able to grow on Pikovskaya’s solid and liquid media and solubilized phosphorus but isolate PkR(7a)* showed maximum P- solubilization of 320.00 mg/l. Thee isolates viz., Pk14(a), Pk14(c) and PC7 had very high HCN production in which the colour of entire filter paper got changed from yellow to brown Out of the forty isolates, the isolates PkH(5), Pk12(d), Pk13(a), Pk13(b), PkR(33)*, PC4 and PC8 were found antagonistic against all the five fungal pathogens namely Alternaria solani, Fusarium oxysporum, Pythium aphanidermatum, Sclerotium rolfsii and Dematophora necatrix. Rests of the isolates were found with different degrees of antagonism against these five fungal pathogens.
Authors and Affiliations
SHAKEELA . S, PADDER S. A, BHAT . Z. A
Keywords
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