Heavy metals in white lupin: uptake, root‐to‐shoot transfer and redistribution within the plant
2006
Page, Valérie | Weisskopf, Laure | Feller, Urs
• The translocation of manganese (Mn), nickel (Ni), cobalt (Co), zinc (Zn) and cadmium (Cd) in white lupin (Lupinus albus cv. Amiga) was compared considering root‐to‐shoot transport, and redistribution in the root system and in the shoot, as well as the content at different stages of cluster roots and in other roots. • To investigate the redistribution of these heavy metals, lupin plants were labelled via the root for 24 h with radionuclides and subsequently grown hydroponically for several weeks. • ⁵⁴Mn, ⁶³Ni and ⁶⁵Zn were transported via the xylem to the shoot. ⁶³Ni and ⁶⁵Zn were redistributed afterwards via the phloem from older to younger leaves, while ⁵⁴Mn remained in the oldest leaves. A strong retention in the root was observed for ⁵⁷Co and ¹⁰⁹Cd. • Cluster roots contained higher concentrations of all heavy metals than noncluster roots. Concentrations were generally higher at the beginning of cluster root development (juvenile and immature stages). Mature cluster roots also contained high levels of ⁵⁴Mn and ⁵⁷Co, but only reduced concentrations of ⁶³Ni, ⁶⁵Zn and ¹⁰⁹Cd.
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