Role of Chitosan in Induction of Defense Response against Phomopsis Vexans and Augmentation of Growth and Yield of Eggplant
chitosan, defense, eggplant, growth, phomopsis blight and fruit rot, P vexans, yield
Abstract
Phomopsis blight and fruit rot disease caused by the fungus Phomopsis vexans is one of the most devastating diseases of eggplant that causes great economic losses especially in tropical and subtropical climates. An experiment was conducted to evaluate the antifungal properties of chitosan against P. vexans by inducing defense-related enzymes and increase the growth and yield contributing characters of eggplant. P. vexans isolate VS-2 was identified as most virulent against eggplant by pathogenicity test. The concentrations of chitosan 0, 0.1, 0.2, 0.3, 0.4 and 0.5% were used to control the fungus in in-vitro trial. There was an effect on mycelial growth reduction of P. vexans by chitosan. The highest mycelial growth reduction was found with 0.5% chitosan at seven days after incubation. Consequently, seeds were treated with chitosan @ 0.5% concentration. Chitosan enhanced the germination percentage and seedling growth such as shoot length, root length, fresh weight and dry weight and reduced post-emergence seedling mortality.
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2018-08-04
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