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Plant and Cell Physiology, 1985, Vol. 26, No. 1 89-98
© 1985

Article

Flower-inducing Activity of Vitamin K in Lemna paucicostata

Sumiko Kaihara and Atsushi Takimoto

Laboratory of Applied Botany, Faculty of Agriculture, Kyoto University Sakyo-ku, Kyoto 606, Japan

Vitamins K1 K3 and K5 induced flowering in Lemna paucicostata 151, a short-day plant, cultured in 1/10 strength M medium (1/10 M medium) under continuous light, and their activity was greatly intensified by simultaneous application of benzyladenine. The most active of these was vitamin K5 L. paucicostata 6746 is more sensitive to vitamin K5 than strain 151, but the effect of vitamin K5 on strain 6746 was not intensified by benzyladenine. The flower-inducing activity of vitamin K5 was intensified by the addition of benzoic acid in both strains and by the addition of copper or ferricyanide in Strain 6746, when these chemicals were added at such low concentrations that they would scarcely induce flowering.

In strain 6746, vitamin K5 added to 1/10 M had little effect on flowering under a subcritical photoperiod, while it clearly induced flowering under continuous light. In this strain, vitamin K5 added to full strength M medium, in which this plant was more sensitive to short photoperiods than in 1/10 M medium, did not induce flowering even under continuous light, and was rather inhibitory under short photoperiods.

(Received August 14, 1984; Accepted October 16, 1984)
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