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Plant and Cell Physiology, 1970, Vol. 11, No. 3 417-425
© 1970

Article

Periodical growth response of Lemna gibba G3 to light-break

YUKITO OOTA

Biological Institute, Nagoya University Chikusa, Nagoya 464, Japan

Brief exposure to light promotes frond multiplication in Lemna gibba G3 in darkness. Extent of promotion changes periodically with the time of the light-break. Response curves are interpreted in terms of a superposition of two modes of growth response to light-break, which are, respectively, under the control of different physiological timing devices; circadian oscillation and the hourglass-type clock. Circadian oscillation, which consists of a half-cycle of increasing photophily followed by another half-cycle of declining photophily, starts at a light-on signal and continues for a few days with rapid damping. The 24-hr period of oscillation is the same at temperatures ranging from 16 to 26°C. The hourglass is released by a light-off signal to ‘accumulate sand’ or to increase photophily in a sigmoidal way with time and is temperature-sensitive; the tempo of‘sand accumulation’ being quicker at 21°C than at 16 or 26°C. Oscillation is hastened to fade-out at 21°C, most likely due to the accelerated pace of the hourglass. Red and far-red reversibility is disclosed in both modes of growth response.

(Received December 31, 1969; )
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