BIOLOGICAL CONTROL MECHANISM OF ALTERNARIA LEAF SPOT DISEASE IN SESAMUM ORIENTALE L. CHALLENGED WITH PSEUDOMONAS FLUORESCENS
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Abstract
Plant pathogenic fungi are of major concern related with reduction of yield in agricultural crops. Currently due to acute
chemical pesticide-related issues, the need for designing biological control against plant diseases have been much
emphasized. Alternaria leaf spot disease is one of the major threats to sesami cultivation. In the present study eco-friendly
management of disease with Pseudomonas fluorescens treatment in Sesamum orientale L. against Alternaria sesami was evaluated
by pot and field trials and also in terms of lytic and antioxidant enzyme system. Peroxidase, polyphenol oxidase,
chitinase and β-1,3 glucanase activities were remarkable after treatment compared to control and was further
substantiated by their isozyme pattern. The fungicidal mechanism of P. fluorescens was based on induction of chitinase and
β-1,3 glucanase production which lyses the fungal cell wall and inhibits its invasion and spreading into host cells. Disease
incidence and disease severity of treated plants under pot and field trials significantly reduced and were at par with 0.1%
Indofil M-45 (Mancozeb) a chemical fungicide. The results were statistically significant (P less than 0.001).
chemical pesticide-related issues, the need for designing biological control against plant diseases have been much
emphasized. Alternaria leaf spot disease is one of the major threats to sesami cultivation. In the present study eco-friendly
management of disease with Pseudomonas fluorescens treatment in Sesamum orientale L. against Alternaria sesami was evaluated
by pot and field trials and also in terms of lytic and antioxidant enzyme system. Peroxidase, polyphenol oxidase,
chitinase and β-1,3 glucanase activities were remarkable after treatment compared to control and was further
substantiated by their isozyme pattern. The fungicidal mechanism of P. fluorescens was based on induction of chitinase and
β-1,3 glucanase production which lyses the fungal cell wall and inhibits its invasion and spreading into host cells. Disease
incidence and disease severity of treated plants under pot and field trials significantly reduced and were at par with 0.1%
Indofil M-45 (Mancozeb) a chemical fungicide. The results were statistically significant (P less than 0.001).
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How to Cite
Shereefa, L., & Murugan, K. (2020). BIOLOGICAL CONTROL MECHANISM OF ALTERNARIA LEAF SPOT DISEASE IN SESAMUM ORIENTALE L. CHALLENGED WITH PSEUDOMONAS FLUORESCENS . Journal of Advanced Scientific Research, 11(Suppl 5), 17-24. https://doi.org/1
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Research Article
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