Induction of systemic resistance in banana (<Emphasis Type="Italic">Musa</Emphasis> spp.) against <Emphasis Type="Italic">Banana bunchy top virus</Emphasis> (BBTV) by combining chitin with root-colonizing <Emphasis Type="Italic">Pseudomonas fluorescens</Emphasis> strain CHA0 |
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Authors: | Mathiyazhagan Kavino Sankarasubramanian Harish Neelakandan Kumar Duraisamy Saravanakumar Ramasamy Samiyappan |
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Institution: | (1) Department of Fruit Crops, Horticultural College and Research Institute, Tamil Nadu Agricultural University, Coimbatore, 641 003, India;(2) Molecular Plant Virology lab, Department of Plant Pathology, National Chung Hsing University, Taichung, 11529, Taiwan;(3) AGROINNOVA, University of Turin, Turin, 10095, Italy;(4) Director, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore, 641 003, India |
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Abstract: | Pseudomonas fluorescens strains CHA0 and Pf1 were investigated for their biocontrol efficacy against Banana bunchy top virus (BBTV) in banana (Musa spp.) alone and in combination with chitin under glasshouse and field conditions. Bioformulation of P. fluorescens strain CHA0 with chitin was effective in reducing the banana bunchy top disease (BBTD) incidence in banana under glasshouse
and field conditions. In addition to disease control, the bioformulation increased the economic yield significantly compared
to the untreated control. Increased accumulation of oxidative enzymes, peroxidase (PO), polyphenol oxidase (PPO), phenylalanine
ammonia lyase (PAL), pathogenesis-related (PR) proteins, chitinase, β-1,3-glucanase and phenolics were observed in CHA0 bioformulation
amended with chitin-treated plants challenged with BBTV under glasshouse conditions. Indirect ELISA indicated the reduction
in viral antigen concentration in P. fluorescens strain CHA0 with chitin-treated banana plants corresponding to reduced disease ratings. The present study revealed that induction
of defence enzymes by P. fluorescens with chitin amendment reduced the BBTD incidence and increased bunch yield in banana. |
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Keywords: | Banana bunchy top virus Chitin Bioformulations Induced resistance Defence enzymes Bunch yield |
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