Abstract
CALCIUM ions are known to be practically immobile in the phloem of plants and are thus not re-translocated from older leaves1. Other elements manifesting low phloem mobility are zinc, boron and iron; the last-mentioned is also immobilized in the xylem in various circumstances2. Apparently, it has not been suggested that elements other than iron may be immobilized in the xylem2.
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References
Biddulph, O., in Plant Physiology, edit. by Steward, F. C., 2, 553 (1959).
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JACOBY, B. Ascent of Calcium in Intact and De-rooted Bean Plants. Nature 211, 212 (1966). https://doi.org/10.1038/211212a0
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DOI: https://doi.org/10.1038/211212a0
