Abstract
Bioagents such as Trichoderma harzianum, Pseudomonas fluorescens and Bacillus subtilis were isolated from cotton rhizosphere soil and tested individually for their effectiveness in controlling bacterial blight of cotton caused by Xanthomonas campestris pv. malvacearum (Xcm). Talc based formulations were prepared and used for seed treatment at different concentrations for assessing their ability to stimulate plant growth and to control bacterial blight disease. Among bioagents, P. fluorescens and T. harzianum proved to be effective in controlling disease under field conditions. Other than direct action, these bioagents triggered the defense related enzymes involved in synthesis of phenols. Higher activity of peroxidase, phenylalanine ammonia-lyase, polyphenol oxidase and b-1,3-glucanase was observed in P. fluorescens and T. harzianum treated cotton plants after challenge inoculation with Xcm. Seed treatment with these bioagents enhanced the seed germination and growth parameters against blight disease and they also induced systemic resistance in plant for defense mechanisms.
Highlights
Cotton (Gossypium spp.) is an important fiber crop and India ranks first in area which is over 88 lakh hectares
Present study mainly focused on the induction of peroxidase (PO), polyphenol oxidase (PPO), phenylalanine ammonia lyase (PAL), and -1, 3-glucanase activities in cotton seedlings by Trichoderma harzianum, P. fluorescens and B. subtilis against Xanthomonas campestris pv. malvacearum
There was improved vigor index up to 2186 in P. fluorescens followed by T. harzianum and B. subtilis with a vigor of 2171and 2169 respectively compared to its respective control 2110
Summary
Cotton (Gossypium spp.) is an important fiber crop and India ranks first in area which is over 88 lakh hectares. Present study mainly focused on the induction of peroxidase (PO), polyphenol oxidase (PPO), phenylalanine ammonia lyase (PAL), and -1, 3-glucanase activities in cotton seedlings by Trichoderma harzianum, P. fluorescens and B. subtilis against Xanthomonas campestris pv. Maximum germination and enhancement of seedling vigor was noticed in the plants due to treatment with P. fluorescens (78%) and T. harzianum (76%) followed by B. subtilis (73%) respectively, whereas the control showed 71%.
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