Fig. 4From: Effect of Zinc and Copper Nanoparticles on Drought Resistance of Wheat SeedlingsThe content of photosynthetic pigments in leaves of winter wheat varieties Stolichna (a) and Acveduc (b) after seed treatment with NPs and drought: 1 control, 2 NPs, 3 drought, and 4–NPs + droughtBack to article page