Reaction of glucosinolate-myrosinase defence system in Brassica plants to pathogenicity factor of Sclerotinia sclerotiorum |
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| Authors: | Siamak Rahmanpour David Backhouse Heather M. Nonhebel |
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| Affiliation: | (1) School of Environmental and Rural Science, University of New England, Armidale, NSW, 2351, Australia;(2) School of Science and Technology, University of New England, Armidale, NSW, 2351, Australia;(3) Present address: Oilseed Crops Research Department, Seed and Plant Improvement Research Institute, Karaj, Iran |
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| Abstract: | The glucosinolate-myrosinase defence system, specific to Brassicales plants, produces toxic volatile compounds during mechanical injury or pathogen attack. The reaction of this system to oxalic acid, known as a pathogenicity factor of Sclerotinia sclerotiorum, is not fully understood. The hydrolysis of glucosinolates was studied at varying conditions in the presence of oxalic acid in the substrate. In a bioassay, colonies of the pathogen were exposed to volatiles from hydrated mustard powder used as a myrosinase and glucosinolate source. The glucosinolate-myrosinase (GSL-M) system was activated in the presence of oxalic acid at a concentration and pH similar to that expected in vivo. Volatile production was inhibited only when the pH fell to 3 or below. It is unlikely that oxalic acid plays a significant role in disarming the GSL-M system during infection of Brassica hosts. |
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