Geetha, N. P. and Amruthesh, K. N. and Shetty Shekar, H. (2004) Chitin oligomers and polyunsaturated fatty acids act synergistically in inducing resistance in pearl millet against downy mildew disease. J. Mycol. Plant Pathol., 34. pp. 724-731.
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Several glycosidic components from the cellwall of pathogenic fungi have been implicated in inducing plant defense response in many host-pathogen systems. Chitin oligomers, released from fungal cellwalls by endochitinase act also as immuno-modulators. Polyunsaturated fatty acids (PUFAs) have been already developed specifically against oomycete pathogens. Downy mildew of pearl millet, caused by Sclerospora graminicola, is a devastating disease, resulting in considerable losses in the semi-arid regions of the world. The efficacy of two combinations of chitin oligomers and PUFAs was examined in vitro and also under epiphytotic conditions in inducing downy mildew resistance in pearl millet. When applied to seeds in greenhouse experiments, chitin oligomers and PUFAs induced 64 and 69% protection, resp. Chitin oligomers-supplemented with PUFAs when applied in combination to pearl millet seeds followed by foliar spray offered higher protection against downy mildew (73%). Plants raised from treated seeds and challenge inoculated at the tillering and inflorescence stages showed disease resistance, resulting in higher grain yield compared to untreated plants. Kinetic anal. of endochitinase elicitation by chitin oligomers and PUFA treatment resulted in increased chitinase activity. The enzyme activity was initiated 6h after the treatment and pathogen inoculation and was maximum at 24 h. The chitin oligomers and PUFAs have the potentiality to develop into future candidate mols. as ecofriendly pesticides in inducing resistance against downy mildew. Many biowastes are now being considered to obtain chitin and PUFA-based compounds to develop com. biopesticides for future plant disease management.
| Item Type: | Article |
|---|---|
| Additional Information: | Publisher: Indian Society of Mycology and Plant Pathology |
| Uncontrolled Keywords: | pearl millet resistance downy mildew chitin polyunsaturated fatty acid |
| Subjects: | B Life Science > Biotechnology |
| Divisions: | Department of > Biotechnology |
| Depositing User: | Dhruva Kumar |
| Date Deposited: | 04 May 2021 10:32 |
| Last Modified: | 04 May 2021 10:32 |
| URI: | http://eprints.uni-mysore.ac.in/id/eprint/12293 |
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