Characteristics of Zinc Uptake by Barley Roots |
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Authors: | WERNER VELTRUP |
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Institution: | Institut für Angewandte Botanik der Universität Münster, D-4400 Münster, Federal Republic of Germany |
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Abstract: | The linear uptake of zinc by excised barley roots (Hordeum distichon L.) in the time range from 20–120 min is not continued over periods of 20–28 h. In concentration dependent uptake experiments with intact barley roots three phases in the range up to 1.38 mM zinc could be detected independent of the tested uptake period. The kinetic constants increased with higher phases and the transition points were lowered with increasing time. The presence of copper did not inhibit the uptake of zinc competitively. On the contrary a slight stimulation in the uptake rates was observed indicating an interaction with the transition site. It is concluded that zinc and copper are taken up by separate mechanisms. |
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