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Local and Systemic Protection Against<i>Phytophthora infestans</i>Induced in Potato and Tomato Plants by Jasmonic Acid and Jasmonic Methyl Ester
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1993
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EngineeringPlant PathologyPlant-pathogen InteractionPlant HealthPhysiological Plant PathologyJasmonic AcidJasmonic Methyl EsterPlant Pathogen EffectorPlant Lipid DerivativesAllergyPlant WoundPlant ProtectionTomato PlantsPlant ImmunityCrop ProtectionMicrobiologyHost ResistanceMedicinePlant Physiology
Jasmonic acid (JA) and jasmonic methyl ester (JME) are plant lipid derivatives that have been postulated to play a role in plant wound and pathogen responses. Here we report that JA and JME applied as foliar sprays to potato (cv. Bintje or Alpha) or tomato (cv. Baby) plants protected them against a challenge infection with Phytophtora infestans. Local protection against P. infestans isolates S49 or MR1 was evident in plants treated with as low as 62.5 μg (∼0.3 μmol)/ml, whereas systemic protection was evident in plants treated with jasmonates at 1000 μg (∼4.8 μmol)/ ml. Jasmonates at 4.8 μmol/ml did not inhibit fungal mycelial growth in agar cultures. JA and JME stimulated direct germination of sporangia in vitro and on planta [...]