Abstract

PLANT GROWTH PROMOTING POTENTIALITY OF MANGROVE RHIZOSPHERIC ORGANISMS

Kannahi M. and Dhivya S.

ABSTRACT

In the present study, the rhizosphere soil of mangrove plants Aegiceras corniculatum and Avicennia marina was collected and the PGP characteristics were studied. The Rhizobacteria were isolated by using different culture medium and identified based on morphological and biochemical characteristics. PGP characteristics of rhizobacteria were determined by phosphate solubilization, screening for salt resistance of rhizobacteria, production of ammonia, production of indole acetic acid, catalase activity, production of cell wall degrading enzyme and microbial antagonism. The phosphate solubilization of Vibrio sp was measured as 34.6mm; ability of solubilization of Bacillus subtilis was measured as 25.0mm; ability of solubilization of Vibrio sp was measured as 26.2 mm. The maximum phosphate solubilization was measured in Vibrio sp when compared with Bacillus subtilis and Clostridium sp.

Keywords: PGPR, Rhizosphere soil, Microbial antagonism, mangrove plant, Rhizobacteria and Indole acetic acid.