Interaction of Botrytis cinerea with the intermediate C3-CAM plant Mesembryanthemum crystallinum
2010
Kuźniak, E. | Kornas, A. | Gabara, B. | Ullrich, C. | Skłodowska, M. | Miszalski, Z.
The interaction between necrotrophic Botrytis cinerea and Mesembryanthemum crystallinum, a C3/CAM intermediate plant, was followed macroscopically, microscopically, by analyzing CAM (Crassulacean Acid Metabolism) related and H₂O₂ accumulation in leaf tissue. In response to infection, M. crystallinum in both C3 and CAM states exhibited hypersensitive response (HR)-like defence response or soft-rot spreading lesions depending on the post-inoculation environmental conditions. Our results point out to the fact that light is required for plant resistance, and HR-like necrotic lesions are co-localized with thermal effects visible on the infrared images possibly related to water disturbances, stomatal closure and H₂O₂ accumulation. In C3 plants, these changes were followed by metabolic shifts towards weak diurnal oscillations of malate content. We suppose that light-dependent processes related to CAM and H₂O₂ accumulation are in parallel with resistance to B. cinerea. This may explain at least partly why CAM plants could be less sensitive to biotic stress factors.
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