Ali Dogru Author

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Antioxidant and Photochemical Responses of Watermelon (Citrullus Lanatus L.) Genotypes to Lead Toxicity

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Ali Dogru

In the present study, lead toxicity-dependent physiological changes were comparatively investigated through photosynthetic and antioxidant activity in two watermelon (Citrullus lanatus L.) cultivars (Celebration and Faroe). Plants were grown for 21 days in perlite and then exposed to 0.5- and 1-mM Pb(NO₃)₂ for additional 6 days. Lead toxicity decreased the photosynthetic pigment contents in the leaves of Faroe. The malondialdehyde content in leaves showed that lipid peroxidation in Celebration was lower than in Faroe. H2O2 accumulation was more remarkable in the leaves of Faroe exposed to 1 mM lead. Significantly higher superoxide dismutase activity observed in in the leaves of Celebration indicates a likely higher rate of superoxide radical dismutation. Lower asco... view more»

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