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We investigated Hg accumulation in maize ( Zea mays ) plants grown in non-contaminated conditions on a farm in Switzerland throughout a growing season. Concentrations of Hg in leaves and husk followed the same temporal pattern as the mass growth of these parts. In contrast, silk and tassel accumulated Hg almost linearly over time until harvest. At the end of the growing season Hg concentration was highest in tassel (10.4 ng g −1 ), followed by leaves (7.3 ng g −1 ) and silk (5.7 ng g −1 ). Silk and tassel had accumulated 5–10 times more Hg per unit dry mass than all aboveground parts of the plant on average. Cob and kernels contained only very small amounts of Hg. Greater exposure of a plant part to the atmosphere was clearly associated with higher rates of Hg accumulation.

Total mercury accumulation in aboveground parts of maize plants ( Zea mays ) throughout a growing season