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© 1972 Oxford University Press

RESEARCH-ARTICLE

Zinc Absorption by Wheat Seedlings and the Nature of its Inhibition by Alkaline Earth Cations

F. M. CHAUDHRY 1 and J. F. LONERAGAN

Department of Soil Science and Plant Nutrition, Institute of Agriculture, University of Western Australia Nedlands. 6009

The effects and interactions of the alkaline earth cations on Zn2+ absorption were studied in. short-term experiments. At low concentrations of Zn2+ (≤ 2 µM), rates of Zn2+ absorption were linear even in the absence of Ca2+ or of other cations. At higher Zn2+ concentrations (5 and 10µm), rates were not linear in the absence of other cations but became linear on addition of 250 µM or more of Ca2+, Mg2+, Sr2+, or Ba2+.

From 0.1 to 10µM Zn2+, all alkaline earth cations inhibited absorption in the order Mg2+ > Ba2+ ≥ Sr2+ = Ca2+. Increasing concentrations of Ca2+ or of Mg2+ from 0 to 40 mM progressively depressed absorption from 1µM ZnCl2. Increasing Ca2+ or Mg2+ from 40 to 100 mM had no further effect on absorption. Over both high and low ranges of Ca2+ or Mg2+ concentrations, the affinity of plant roots for Zn2+ and the responses of Zn2+ absorption to temperature, H+, and Cu2+ were identical. At equal concentrations over the whole concentration range, Mg2+ was 30 per cent more effective than Ca2+ in inhibiting absorption. At concentrations below 40 mM, Ca2+ and Mg2+ competed with each other in their inhibiting effects. At concentrations above 40 mM, Ca2+ alleviated the extra inhibitory effects of Mg2+ in some unknown way.

The alkaline earth cations inhibited Zn2+ absorption non-competitively. They depressed it to values which would limit vigorous plant growth. It is postulated that their effects are important in the zinc nutrition of plants in soil and in solution cultures.


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