Studies on light-induced resistance of cucumber against host specific toxin producing pathogen

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In this study, effect of red light irradiation on lesion development by Corynespora cassiicola in cucumber was investigated. When cucumber inoculated with C. cassiicola kept under natural light, large necrotic lesions were formed. Under red light, however, lesion formation was significantly inhibited. Such red light induced resistance was not observed in cucumber infected with Colletotrichum.orbiculare. Red light-induced resistance of cucumber against C. cassiicola was significantly inhibited by the pre-treatment with plant activator Bion which activate salycilic acid-dependent resistance pathway.