Cadmium was found in electron-dense granules inside root parenchyma cells of Agrostis gigantea Roth and of Zea mays L. (maize) exposed to 3 mmol m −3 CdSO 4 . Cadmium-bearing granules were found in the cytoplasm and vacuoles of differentiating and mature cells and in nuclei of undifferentiated cells. Cadmium-bearing granules were absent from cell walls and epidermal cells. In addition to Cd, the electron-dense granules contained variable proportions of Ca, Fe, Ni, P, Pb, and Zn.
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Rauser et al. (1987) studied this question.