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Plant and Cell Physiology, 1986, Vol. 27, No. 1 127-133
© 1986

Article

Flower Induction by Suppression of Nitrate Assimilation in Lemna paucicostata 6746

Osamu Tanaka1, Wataru Horikawa1, Hisao Nishimura2 and Yutaka Nasu3

1Department of Biology, Faculty of Science, Konan University Kobe 658, Japan
2Department of Hygiene, Aichi Medical University Nagoya 480-11, Japan
3Department of Public Health, Shinshu University School of Medicine Matsumoto 390, Japan

In vitro activity of nitrate reductase was studied in Lemna paucicostata 6746 grown on modified Hoagland medium supplemented with 1% sucrose, containing various inhibitors. Copper, silver, tungstate or cyanide which induces daylength-independent flowering, inhibited the nitrate reductase activity, but azide which does not induce daylength-independent flowering did not. Molybdate-deficient medium induced flowering, and inhibited nitrate reductase activity. Lowering of nitrate level of the medium also induced daylength-independent flowering.

These results suggest that the suppression of nitrate assimilation causes daylength independent flowering in Lemna paucicostata 6746, and that one of the flower-inducing actions of the copper, silver, tungstate, cyanide or the deletion of molybdate is to suppress the nitrate assimilation.

(Received June 26, 1985; Accepted October 30, 1985)
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