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Cadmium loading into potato tubers: the roles of the periderm, xylem and phloem
Author(s) -
REID R. J.,
DUNBAR K. R.,
MCLAUGHLIN M. J.
Publication year - 2003
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1046/j.1365-3040.2003.00945.x
Subject(s) - stolon , xylem , phloem , solanum tuberosum , cadmium , botany , biology , solanaceae , solanum , chemistry , biochemistry , organic chemistry , gene
The mobility of Cd in potato plants ( Solanum tuberosum ) was examined using both short‐term radioisotopic labelling with 109 Cd and long‐term growth experiments in soil supplemented with Cd, with an emphasis on the pathways through which Cd is taken up by tubers. Split‐pot experiments showed that tubers and their associated stolons and stolon roots contribute only a minor fraction to the overall Cd absorption by the plant. Most of the Cd was absorbed by the basal roots. 109 Cd absorbed from the soil was rapidly exported to other parts of the plant, especially the stem, with significant amounts appearing in the tubers within 30 h. Application of 109 Cd to leaves showed that Cd can be rapidly distributed via the phloem to all tissues. The results suggest that unlike Ca, Cd has high mobility in plants in both xylem and phloem, and that stems may have an important role in transfer between these two pathways.