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Plant and Cell Physiology, 1970, Vol. 11, No. 2 293-301
© 1970

Article

Endogenous light-on rhythm in respiration of a long-day duckweed, Lemna gibba G3

HISAO MIYATA

Biological Institute, Faculty of Science, Nagoya University Chikusa, Nagoya 464, Japan

1. The rate of O2-uptake of Lemna gibba G3 changed with a damped diurnal rhythm under continuous illumination given after short days. The rhythm was started by a light-on stimulus with a 6 hr lag period and is thought to be under the control of a biological clock.

2. The 6 hr lag period was replaceable with a 6 hr dark period interrupted twice (at 0 and 3 hr) by a brief illumination with red light. The effect of red light was removed by immediate exposure to far-red light. This effect of far-red was reversed by subsequent red light. The 6 hr lag may involve a phytochrome-mediated reaction which may be preparatory to the induction of this rhythm.

(Received December 13, 1969; )
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W. S. Hillman
Calibrating Duckweeds: Light, Clocks, Metabolism, Flowering
Science, August 6, 1976; 193(4252): 453 - 458.
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