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Plant and Cell Physiology, 1992, Vol. 33, No. 6 757-762
© 1992

Time-Measuring Processes Involved in the Photoperiodic Response of Lemna paucicostata 441

Hyoya Hayashi1, Sumiko Kaihara1 and Atsushi Takimoto2

1 Laboratory of Applied Botany, Faculty of Agriculture, Kyoto University Kyoto, 606 Japan
2 Laboratory of Experimental Biology Kyoto, 16-2 Koyama-Hatsunecho, Kitaku, Kyoto, 603 Japan

Lemna paucicostata 441 exposed to a single dark period of various lengths showed a rhythmic flowering response with a 22- to 24-h period, even when the dark period was preceded by continuous light. The critical night length (about 12 h) was scarcely influenced by pretreatment with 8D–4L (8 h of darkness followed by 4 h of light), 8D–8L or 8D–12L. However, the rhythm of the response in the second cycle was markedly damped by the pretreatment with 8D–4L or 8D–12L, and was slightly amplified by 8D–8L.

The flowering response to a red-light interruption given at different times in the inductive dark period also showed circadian rhythmicity even when the dark period was preceded by continuous light, and this rhythmicity was scarcely influenced by a dark-light treatment given prior to the inductive dark period. A red-light interruption given at the 6th or 14th hour of the dark period markedly shifted the phase of the rhythm of the response to the length of the following dark period (the former delayed and the latter advanced), but that given at the same phase markedly weakened and disturbed the rhythmicity of the response to a red-light interruption given in the following dark period.

(Received March 21, 1992; Accepted June 12, 1992)
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