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Type: Journal article
Title: The uptake and partitioning of cadmium in two cultivars of potato (Solanum tuberosum L.)
Author: Dunbar, K.
McLaughlin, M.
Reid, R.
Citation: Journal of Experimental Botany, 2003; 54(381):349-354
Publisher: Oxford Univ Press
Issue Date: 2003
ISSN: 0022-0957
Statement of
K. R. Dunbar, M. J. McLaughlin, and R. J. Reid
Abstract: The uptake and distribution of Cd in potatoes over the course of a growing season was investigated in two cultivars of potatoes that differed in tuber Cd concentration. Plants were grown in soil with supplemental Cd. The concentrations of Cd in different tissues varied greatly in the order roots>shoots>> tubers. After the initiation of tuber bulking, shoot growth ceased and the increase in total plant Cd was mostly due to accumulation in the tubers. The constancy of the Cd concentration in shoots suggested that import of Cd via the xylem must be matched by export in the phloem, which implied that Cd must have significant phloem mobility. It was found that the differences in tuber Cd between cultivars Wilwash and Kennebec were not due to differences in total uptake or growth, but to differences in Cd partitioning within the plant. This partitioning was specific to Cd and was not observed for a range of nutrient elements. Most of the differences in tuber Cd concentration between the cultivars could be accounted for by a 3-fold higher retention of Cd in the roots of cv. Wilwash. The involvement of root sequestration, and xylem and phloem pathways in the loading of Cd into tubers is considered.
Keywords: Cadmium
Species Specificity
Solanum tuberosum
Description: Copyright © 2003 Oxford University Press
DOI: 10.1093/jxb/erg016
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Appears in Collections:Aurora harvest 2
Earth and Environmental Sciences publications
Environment Institute publications

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