Absorption of Copper by Lemna as Influenced by Some Factors Which Nullify the Copper Effect on Flowering and Growth |
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| Authors: | Tanaka Osamu; Nasu Yutaka; Takimoto Atsushi; Kugimoto Mamoru |
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| Institution: | 1Laboratory of Applied Botany, Faculty of Agriculture, Kyoto University Kyoto 606, Japan
2Department of Public Health, School of Medicine, Shinshu University Asahi, Matsumoto 390, Japan |
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| Abstract: | The effect of copper on flowering and growth of Lemna paucicostata6746 and Lemna gibba G3 in a copper-containing medium is nullifiedby the addition of EDTA, ammonium ions or salicylic acid tothe medium or a decrease in its nitrate concentration. Thesefactors were examined for their effects on the absorption ofcopper by the plants. The addition of EDTA to the medium completelyinhibited the absorption of copper in both species, thus eliminatingthe copper effect. Ammonium ions also inhibited copper absorption,their effectiveness rising with their concentration. Loweringthe nitrate concentration in the medium nullified the coppereffect on flowering in L. paucicostata 6746, and the additionof salicylic acid to the medium also nullified the copper effectin L. gibba G3, both without affecting the absorption of copper. (Received June 7, 1982; Accepted August 27, 1982) |
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