Flower-Promoting Effects of Iron and EDDHA in Lemna paucicostata 151 |
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Authors: | Nishioka Hitoshi; Nasu Yutaka; Kugimoto Mamoru; Kaihara Sumiko; Takimoto Atsushi |
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Institution: | 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 |
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Abstract: | Lemna paucicostata 151 cultured in 1/10 strength M medium containing50 µM FeCl3 easily flowered in response to short days,although it scarcely flowered under any photoperiod when themedium contained the standard amount of iron (2 µM FeCl3).The flowering response was accomparied by an increase in theiron content of the plants, which was maximal at pH 5.0. Instandard M medium containing 50 µM FeCl3, this plant didnot flower even though it had a high iron content. Ethylenediamine-di (o-hydroxyphenylacetic acid) (EDDHA) inducedflowering of this strain under continuous light even in theabsence of iron and copper, and its effect was slightly loweredby the presence of iron in the medium. Thus the flower-inducingactivity of EDDHA could not be attributed to the action of ironor copper. EDTA inhibited both the iron uptake and floweringin Fe-rich medium under short-day conditions. (Received May 16, 1986; Accepted July 25, 1986) |
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