1969•Photochemistry and PhotobiologyRequires access

INTERACTIONS BETWEEN LIGHT AND CIRCADIAN RHYTHMS IN PLANT PHOTOPERIODISM*,†

T. Hoshizaki, K. C. Hamner

Abstract

Abstract— The timing mechanism in plant photoperiodism seems to involve two endogenous circadian rhythms: a light‐on (dawn) rhythm and a light‐off (dusk) rhythm. Following a period of darkness light may affect flowering without affecting the rhythms, or it may affect flowering by rephasing the rhythms. A hypothesis is presented concerning the mechanism of the interaction between illumination and endogenous rhythms based upon correlations between leaf movements and flowering responses in various photoperiodic treatments. The possible role played by phytochrome in the response is considered in relation to the effects of light quality on the responses.

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Available abstract

Key concepts: photoperiodism, Circadian rhythm, Phytochrome, Rhythm, Darkness, Dusk, Biology, Endogeny