Chitosan enhances disease resistance in pearl millet against downy mildew caused by Sclerospora graminicola and defence-related enzyme activation

Manjunatha, G. and Roopa, K. S. and Geetha Prashanth, N. and Shetty, H. S. (2008) Chitosan enhances disease resistance in pearl millet against downy mildew caused by Sclerospora graminicola and defence-related enzyme activation. Pest Management Science, 64 (12). pp. 1250-1257. ISSN 1526-4998

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Official URL: https://doi.org/10.1002/ps.1626

Abstract

Abstract BACKGROUND: The present study investigated the effect of chitosan seed priming on the induction of disease resistance in pearl millet against downy mildew disease caused by Sclerospora graminicola (Sacc.) Schroet. RESULTS: Pearl millet seeds were primed with chitosan at different concentrations: 0.5, 1.5, 2.5 and 3 g kg−1 seed. Of the different concentrations, 2.5 g kg−1 was found to be optimum, with enhanced seed germination of 99% and seedling vigour of 1782, whereas the untreated control recorded values of 87% and 1465 respectively. At optimum concentration, chitosan did not inhibit sporulation and release of zoospores from sporangia. Furthermore, pearl millet seedlings raised after seed treatment with chitosan showed an increased level of the defence-related enzymes chitosanase and peroxidase as compared with the untreated pearl millet seedlings on downy mildew pathogen inoculation. The effect of chitosan in reducing downy mildew incidence was evaluated in both greenhouse and field conditions, in which respectively 79.08 and 75.8% disease protection was obtained. CONCLUSION: Chitosan was effective in protecting pearl millet plants against downy mildew under both greenhouse and field conditions by inducing resistance against the pathogen. Thus, chitosan formulation can be recommended for seed treatment in the management of downy mildew disease. Copyright © 2008 Society of Chemical Industry

Item Type: Article
Uncontrolled Keywords: chitosan, pearl millet, Sclerospora graminicola, downy mildew, chitosanase, peroxidase
Subjects: B Life Science > Botany
Divisions: Department of > Botany
Depositing User: Manjula P Library Assistant
Date Deposited: 16 Aug 2019 07:30
Last Modified: 13 Dec 2022 06:14
URI: http://eprints.uni-mysore.ac.in/id/eprint/6429

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