Author(s): Sujatha N and K Ammani
In recent years, biological control has become a promising alternative to chemical control in the management of soil borne disease A group of root-associated bacteria, plant growth promoting rhizobacteria (PGPR), intimately interact with the plant roots and consequently influence plant health and soil fertility. Among these PGPR, fluorescent psuedomonads occur commonly in the rhizosphere of plants and help suppress disease establishment and spread by secretion of antibiotics. The present study focuses on the extraction and identification of the antifungal compound secreted by Psueudomonas fluorescens. Considering the global significance of antifungal metabolites in disease suppression and consequent applicability of psuedomonads in biological control strategies, the bio control potential of fluorescent pseudomonads against F. oxysporum and R. bataticola have been reported. These compounds were identified as phenazine-1-carboxylic acid (PCA) and 2-hydroxyphenazine (2-OH-PHZ).