Involvement of Ethylene in Herbicide-Induced Resistance toFusarium oxysporumf. sp.melonis

Publisher Website
Google Scholar
Abstract
Pretreatment of melon [Cucumis melo] seedlings with the herbicide dinitramine induced resistance to subsequent inoculation with Fusarium oxysporum f. sp. melonis. Ethylene production in leaves and stems of the herbicide-treated plants or in genetically resistant ones was much suppressed compared with nontreated diseased seedlings. Ethylene production in diseased seedlings reached its peak shortly after the appearance of symptoms. Similarly, dinitramine increased resistance to Fusarium wilt and suppressed ethylene production in tomato seedlings. Suppression of ethylene production was positively correlated with levels of induced resistance in melon seedlings treated with various herbicides or with various concentrations of dinitramine. Aminoethoxyvinylglycine and aminooxyacetic acid, which inhibit ethylene biosynthesis, induced resistance to Fusarium wilt and suppressed ethylene production. Silver thiosulfate, an inhibitor of ethylene action, also increased resistance to Fusarium wilt.