Chitinase and peroxidase activities in sunflower hypocotyls: Effects of BTH and inoculation with Plasmopara halstedii
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Systemic acquired resistance (SAR) can be induced in plants by incompatible pathogens, pathogen derived extracts, or certain chemicals as benzothiadiazole (BTH). The aim of this work was to compare changes in peroxidase and chitinase activities, enzymes considered as PR-proteins, caused by BTH and the pathogen Plasmopara halstedii. Hypocotyls from susceptible and resistant BTH-treated sunflower seedlings showed increased peroxidase and chitinase activities. Inoculation with P. halstedii increased chitinase and peroxidase activities in inoculated hypocotyls from susceptible but not from resistant sunflower seedlings.
Additional key wordsHelianthus annuus plant defense mildew
benzo[1,2,3]thiadiazole-7-carbothioic acid S-methyl ester
local acquired resistance
pathogenesis related proteins
systemic acquired resistance
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