Figure 2.

Uptake and toxicity in response to Cu²⁺ and Ca²⁺ in wheat seedlings, showing the uptake of Cu²⁺ as a function of {Cu²⁺}_b at different [CaCl₂] (A), the effect of Ca²⁺ on EA50{Cu²⁺}_b (B), and the effect of Ca²⁺ on EA50{Cu²⁺}₀ (C). Error bars indicate 95% confidence intervals. Different letters indicate significant differences among means (P < 0.01). Data are from experiments 3 and 11. RDW, Root dry weight.