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Plant and Cell Physiology, 1974, Vol. 15, No. 2 287-293
© 1974

Article

Flowering of the long-day plant, Lemna gibba, under short-day schedules composed of red and far-red light

Yoshio Ishiguri and Yoshiharu Oda

Institute for Agricultural Research, Tohoku University Sendai, Japan

Flowering in Lemna gibba, a long-day duckweed, can be induced under a short-day condition when the photoperiodic regimes are R7FR3 (7 hr red followed by 3 hr far-red), R5FR5 and R3FR7. This indicates the necessity of a proper balance between red and far-red effects for flowering. The flowering induced by these regimes is inhibited by a brief exposure to red given at the start of darkness and this inhibition is reversed by subsequent exposure to far-red. Thus, the red/far-red reversible effect is found only at the beginning of darkness for flowering of L. gibba.

However, flowering of L. gibba is promoted by a red light break given near the middle of a 14 hr dark period. The promotive effect is not reversed by subsequent exposure to far-red, i.e., the effect of the red break converts from inhibition to promotion as when given later in the dark period, which suggests the involvement of a timing mechanism.

(Received July 21, 1973; )
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