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Lithium seems to diminish the action of phytochrome on the flower induction: under long-day conditions 10(-3) M LiCl inhibits flower production in the long-day plant Lemna gibba Gl. However, under the same conditions flowering in the short-day plant Lemna perpusilla 6746 is stimulated by 10(-3) M LiCl.ADP seems to enhance the action of phytochrome on flower induction: under long-day conditions 10(-4) M ADP promotes the flowering in Lemna gibba G1 (Kandeler, 1969a, b). However, it inhibits flowering in Lemna perpusilla 6746.It is assumed that Li(+) acts as antagonist to K(+) (see Eberius). Since K(+) and ADP are also cofactors for the phytochrome regulation of membrane potential (Tanada, 1968b), it is assumed that the regulation of membrane properties is the general physiological primary reaction of phytochrome.

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