Author(s):

M Syamala and M Sivaji

Abstract: The Plant Growth Promoting Rhizobacteria (PGPR) organisms provide protection to plants against diseases by suppressing deleterious and pathogenic microorganisms producing of hormones, hydrogen cyanide (HCN), various beneficial volatile compounds, siderophores, bacteriocins etc and also act as a bio fertilizer like P solublization, N fixation, IAA production etc…, present research mainly concentrated on exploration of Pseudomonas fluorescens and Bacillus PGP activities like SA, IAA, β 1, 3 glucanase production and P solublization. Around fifty one isolates of Pseudomonas fluorescens and ten Bacillus subtilis isolates were isolated from the rhizosphere soil of Aloe vera, among fifty one Pseudomonas, Pf 32 and followed by Pf 45 produced maximum quantity of salicylic acid (SA), Pf 45 recorded maximum indole acetic acid (IAA) production. The isolate Pf 32 solubilized high phosphorous in the sperber’s hydroxyl apatite medium and higher amount of β 1, 3 glucanase production.

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