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Plant and Cell Physiology, 1986, Vol. 27, No. 7 1369-1376
© 1986

Article

Flower-Promoting Effects of Iron and EDDHA in Lemna paucicostata 151

Hitoshi Nishioka1, Yutaka Nasu2, Mamoru Kugimoto2, Sumiko Kaihara3 and Atsushi Takimoto3,4

1Biological Research Center, Nihon Nohyaku Co. Ltd. Kawachi-Nagano, Osaka 586, Japan
2Department of Public Health, Faculty of Medicine, Shinshu University Matsumoto 390, Japan
3Laboratory of Applied Botany, Faculty of Agriculture, Kyoto University Kyoto 606, Japan

4 To whom correspondence should be addressed.

Lemna paucicostata 151 cultured in 1/10 strength M medium containing 50 µM FeCl3 easily flowered in response to short days, although it scarcely flowered under any photoperiod when the medium contained the standard amount of iron (2 µM FeCl3). The flowering response was accomparied by an increase in the iron content of the plants, which was maximal at pH 5.0. In standard M medium containing 50 µM FeCl3, this plant did not flower even though it had a high iron content.

Ethylenediamine-di (o-hydroxyphenylacetic acid) (EDDHA) induced flowering of this strain under continuous light even in the absence of iron and copper, and its effect was slightly lowered by the presence of iron in the medium. Thus the flower-inducing activity of EDDHA could not be attributed to the action of iron or copper. EDTA inhibited both the iron uptake and flowering in Fe-rich medium under short-day conditions.

(Received May 16, 1986; Accepted July 25, 1986)
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