PGPR mediated management of stem blight of Phyllanthus amarus (Schum and Thonn) caused by Corynespora cassiicola (Berk and Curt) Wei |
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| Authors: | S Mathiyazhagan K Kavitha S Nakkeeran G Chandrasekar K Manian P Renukadevi |
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| Institution: | 1. Department of Plant Pathology , Tamil Nadu Agricultural University , Coimbatore-641003, India;2. Department of Crop Physiology , Tamil Nadu Agricultural University , Coimbatore-641003, India |
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| Abstract: | Bacillus subtilis (BSCBE4), Pseudomonas chlororaphis (PA23), endophytic P. fluorescens (ENPF1) inhibited the mycelial growth of stem blight pathogen Corynespora casiicola (Berk and Curt)Wei under in vitro. All these bacterial isolates produced both hydroxamate and carboxylate type of siderophores. But the siderophore production was maximum with the isolate ENPF1. Delivering of talc based formulation of BSCBE4 through seedling dip and foliar application effectively reduced stem blight disease incidence and increased the dry matter production under pot culture and field conditions. Application of BSCBE4, PA23 and ENPF1 increased the defense related enzymes such as peroxidase, polyphenol oxidase, chitinase and β-1,3 glucanase in P. amarus up to ten days after challenge inoculation with C. cassicola. Native gel electrophoretic analysis revealed that challenge inoculation of pathogen with BSCBE4 and PA23 induced both peroxidase and polyphnol oxidase isoforms. |
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| Keywords: | Phyllanthus amarus Corynespora casiicola Peroxidase Polyphenol oxidase Chitinase β-1 3 glucanase Bacillus subtilis Pseudomonas chlororaphis Induced systemic resistance |
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