Journal of Biological Control

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Certain rhizosphere organisms called plant growth promoting rhizobacteria (PGPR) are capable of inducing systemic defense in plants by enhancing the activity of defense enzymes produced in the plant system. In an experiment conducted in pot cultured seedlings of cocoa, three biocontrol agents, viz., Pseudomonas fluorescens, Bacillus subtilis and Trichoderma viride, were able to promote the activity of the defense enzymes (called PR proteins), viz., peroxidase, polyphenol oxidase, phenyl alanine ammonia lyase, catalase and chitinase in the plants when applied in the soil. The results showed that the biocontrol agents varied in their ability to activate different enzymes and sustain their persistence in the seedlings, P. fluorescens being the best in inducing the defense enzymes.

Keywords

Induced Resistance, PGPR, Pseudomonas fluorescens, Bacillus subtilis, Trichoderma viride, Rhizosphere, Biocontrol.
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