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Cytokinin (Z, ZR, and Z+ZR) concentrations and Z/ZR ratio in leaf 4 (A, D, G, J), xylem sap (B, E, H, K), and roots (C, F, I, L) of tomato plants (cv. Moneymaker) grown for 3 weeks on half-strength Hoagland's medium in the absence (closed circles) or presence of 100 mM NaCl (open circles). Data are means of three plants ±SE. Asterisks: see Fig. 1. (Leaf data are replotted from Ghanem et al., 2008.)
