The effect of pH on Cu toxicity in maize cv. Capella was studied in 3 sol. culture experiments of different design. Raising the pH intensified the toxic effect of Cu which reduced root growth and enhanced association of Cu2+ ions with physiologically essential sites in the roots when competition from protons was lowered. (Abstract retrieved from CAB Abstracts by CABI’s permission)
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Lexmond et al. (1981) studied this question.