Archives of Phytopathology and Plant Protection (2013) 46, 1667-1682

Moustafa Hemdan Ahmed Moharam (2013)
Induction of defence-related biochemical changes in okra leaves to powdery mildew disease by several plant-derived agents
Archives of Phytopathology and Plant Protection 46 (14), 1667-1682
Abstract: Certain plant-derived agents (PDA) which could induce resistance in okra leaves against powdery mildew (Erysiphe cichoracearum) and biochemical changes in treated leaves were investigated during 2011 and 2012 growing seasons. At the two-leaf old, four- and eight-week leaves of the greenhouse-grown okra plants were sprayed with either PDA two days before inoculation with conidia. Among all tested PDA, neem seed oil (NSO) caused the highest protection, followed by jojoba oil (JO) and extract of Reynoutria sachalinensis. Moreover, levels of total protein, activity of peroxidase, polyphenyloxidase and chitinase and total phenols content of treated two-leaf old highly increased after application of NSO and JO, but not by the pathogen (untreated control). Finally, based on conidia germination, lack of the fungitoxic effect of JO and RE and also the slight effect of NSO (9-13.75%) may demonstrate the main role of these agents for inducing resistance through the activation of biochemical defence in treated leaves.
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Link to article at publishers website
Database assignments for author(s): Moustafa H.A. Moharam

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Golovinomyces cichoracearum	Okra and relatives (Abelmoschus)