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Plant and Cell Physiology, 1969, Vol. 10, No. 2 399-409
© 1969

Article

The action of skeleton photoperiods on flowering in Lemna perpusilla

YOSHIHARU ODA

Institute for Agricultural Research, Tohoku University Sendai, Japan

The effects of 24 hr cycle skeleton photoperiodic schedules involving two short light pulses on flowering in Lemna perpusilla have been studied. Simulation of complete photoperiods by corresponding skeletal ones is nearly perfect for all photoperiods up to 8 hr and is unstable for periods of 9 to 13 hr. A jump in the response phase appears when skeleton photoperiods ranging from 12 to 13hr are given. For all skeleton photoperiods longer than 14 hr the phase is entrained so that it agrees with that given by skeleton photoperiods of complemental lengths. That is, a skeleton photoperiod of 18 hr is equivalent to that of 6 (= 24–18) hr. Simulation is largely related to whether the second pulse is locked on to "dawn" or to "sunset" depending on when it falls during the dark period following the first pulse.

The inductive action of skeleton photoperiods that gives unstable entrainment depends on the length of a preliminary dark period given before the plant receives the first pulse, since in these skeleton schedules the sensitive zone to the second pulse shifts with the length of the preliminary darkness.

Thus, we tentatively conclude that the circadian oscillation in L. perpusilla involves an entrainment mechanism and that photoperiodic induction is contingent on the coincidence of light and a specific inductive phase in oscillation.

(Received September 18, 1968; )
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