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Effect of exogenous application of CaCl2 (0.5%) on lignin production in the stem of tomato plants. A and B Control (water treated); C and D CaCl2-0.5% (observed after 10 days of elicitor application); E and F Pathogen inoculated (observed after 10 days); G and H CaCl2 (0.5%) + pathogen inoculated plant (observed after 10 days). Arrows indicate the sites of lignin synthesis
