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Plant and Cell Physiology, 1982, Vol. 23, No. 8 1479-1482
© 1982

Short communication

pH Dependence of the Copper Effect on Flowering, Growth and Chlorophyll Content in Lemna paucicostata 6746

Osamu Tanaka1, Yutaka Nasu2, Daisuke Yanase1, Atsushi Takimoto1 and Mamoru Kugimoto2

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

The short-day plant Lemna paucicostata 6746 took up the same amount of copper from the medium whether the pH of the medium was 4.1 or 5.1. At pH 4.1, an addition of copper to the medium resulted in an unchanged chlorophyll content, a somewhat reduced growth rate and a substantial induction of long-day flowering. By contrast, at pH 5.1 the same copper concentration caused a reduction in the chlorophyll content and strong inhibition of growth, but it did not induce any long-day flowering.

(Received June 14, 1982; Accepted October 14, 1982)
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