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Effect of Metabolic Inhibitors on Red Light-induced Resistance of Broad Bean (Vicia faba L.) against Botrytis cinerea

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A possible relationship between the synthetic activities of broad bean leaves and red light-induced resistance against Botrytis cinerea was examined. Both lesion formation and fungal development were suppressed under red light irradiation. In red light-irradiated leaflets, restricted chocolate lesions were observed only on their inoculated adaxial surfaces, whereas black lesions extended to non-inoculated abaxial surfaces in the dark. In microscopic studies, clear cell browning was recognized only in red light-irradiated leaves. Treatment of leaves with an inhibitor of photosynthesis, 3-(3,4-dichlorophenyl)-1,1-dimethyl urea (DCMU) (25 μm), and an inhibitor of protein synthesis, cycloheximide (25 μg/ml), inhibited the induction of resistance by red light irradiation. Moreover, DCMU- and cycloheximide-treated leaflets produced black necrotic lesions even under red light irradiation for 48 h, which extended to the non-inoculated abaxial surface. DCMU did not affect fungal growth, spore production or spore germination of B. cinerea. By contrast, cycloheximide at 25 μg/ml suppressed mycelial growth, but not spore production, whereas cycloheximide at the same concentration completely inhibited spore germination. These results suggest that red light-induced resistance possibly depends on host photosynthesis and protein synthesis.
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Keywords: Red light; induced resistance; photosynthesis and protein synthesis inhibitors

Document Type: Research Article

Affiliations: 1: Laboratory of Plant Pathology, Faculty of Life and Environmental Science, Shimane University, Matsue 690-8504, Japan; 2: Department of Crop Science, University of Illinois, N-533 Turner Hall, 1102 South Goodwin Avenue, Urbana, IL 61801, USA

Publication date: September 1, 2002

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