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Induction of Defence Mechanisms in Grapevine Leaves by Emodin- And Anthraquinone-Rich Plant Extracts and Their Conferred Resistance to Downy Mildew

Induction of Defence Mechanisms in Grapevine Leaves by Emodin- And Anthraquinone-Rich Plant Extracts and Their Conferred Resistance to Downy Mildew

Sophie Godard, Ivan Slacanin, Olivier Viret, Katia Gindro

Plant Physiol Biochem. 2009 Sep;47(9):827-37.

PMID: 19447634

Abstract:

The ability of two plant extracts, Rheum palmatum root extract (RPRE) and Frangula alnus bark extract (FABE), to protect Vitis vinifera leaves from Plasmopara viticola infection was evaluated. These natural products are toxic to the pathogen and induce defence reactions in a susceptible cultivar of V. vinifera (V. vinifera cv. Chasselas), including stilbenic phytoalexin accumulation, enhanced peroxidase (EC 1.11.1.7) activity, and a hypersensitive reaction. Inhibition of the first stage of biotrophic hyphal development of P. Viticola by the two plant extracts was observed. HPLC-DAD-MS analysis showed that these two natural extracts contain many phenolic compounds belonging to the anthraquinone family, such as rhein, frangulin A, emodin, aloe-emodin, chrysophanol, and physcion. Emodin alone is able to impair P. viticola development and to stimulate viniferins and the accumulation of pterostilbene.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP521620	Frangulin A		521-62-0	Price

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