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Excretion of ions (Cd 2+ , Li + , Na + and Cl − ) by Tamarix aphylla
Author(s) -
Hagemeyer Jürgen,
Waisel Yoav
Publication year - 1988
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1988.tb05438.x
Subject(s) - excretion , chemistry , cadmium , shoot , zoology , nuclear chemistry , botany , biochemistry , biology , organic chemistry
Excretion of minerals by the NaCl‐resistant and comparatively cadmium‐resistant tree Tamarix aphylla (L.) Karst, was investigated. Cd 2+ was excreted by plants exposed for 1–10 days to 9 or 45 μ M Cd 2+ solutions. Excretion of this toxic ion increased considerably with time but was less than 5% of the quantities that had been accumulated in the shoots. Excretion of Na + and Cl − was positively correlated with NaCl concentration (1.5, 10, 50 m M ) of the medium. The Na + /Cl − ratios of the excrete were positively correlated with the concentration of the treatment solution. Ca 2+ excretion decreased with increasing NaCl concentrations of the solution. Excretion of K + and Mg 2+ was only little affected by NaCl. Excretion of Li + occurred whenever this element was supplied in the uptake solution; daily excretion rates of Li + increased with time. The ecological significance of excretion is discussed in relation to the low selectivity of the mechanism in T. aphylla .