Defence response of french bean to Uromyces appendiculatus induced by traizole and strobilurin fungicides
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Keywords:French bean, Phaseolus vulgaris, Uromyces appendiculatus, fungicides, defence enzymes.
AbstractThe strobilurin and traizole group of fungicides comprise a variety of synthetic plant-protecting compoundsÂ with broad-spectrum antifungal activity. In the present study, azoxystrobin (1000 Î¼g/ml), tebuconazle (1000Â Î¼g/ml), hexaconazole (1000 Î¼g/ml) and mancozeb (2500 Î¼g/ml) were evaluated for their efficacy in inducingÂ Defence enzymes in French bean against Uromyces appendiculatus. The application of fungicides triggeredÂ the activity of Defence related enzymes viz., peroxidise (PO), polyphenol oxidase (PPO) and phenylalanineÂ ammonia lyase (PAL) in bean plants upon challenge inoculation with U. appendiculatus. The activities ofÂ Defence enzymes reached a peak at five days after inoculation (DAI) with the pathogen and was foundÂ more in bean plants treated with azoxystrobin followed by tebuconazole and hexaconazole as compared toÂ control while it was least in mancozeb.
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