photoperiodismn.
/ˌfəʊtə(ʊ)ˈpɪərɪədɪz(ə)m/, U.S. /ˌfoʊdoʊˈpɪriəˌdɪz(ə)m/ Biology.
The phenomenon whereby certain physiological processes in animals and plants are influenced by the length of daily exposure to light.
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the world > life > biology > biological processes > light-related processes > [noun] > photoregulation > period of exposure to daylight > reactions to changes in
photoperiodism1920
photoperiodicity1926
1920 W. W. Garner & H. A. Allard in Jrnl. Agric. Res. 18 603 The term photoperiod is suggested to designate the favorable length of day for each organism, and photoperiodism is suggested to designate the response of the organism to the relative length of day and night.
1929 J. E. Weaver & F. E. Clements Plant Ecol. xiii. 328 Knowledge of photoperiodism, as these responses to length of day are called, should aid the plant breeder.
1976 Sci. Amer. Feb. 114/2 Most of the early investigations of photoperiodism in insects were concerned with the nature and location of the photoreceptors and the effector system.
1992 Watertown (N.Y.) Daily Times 26 Jan. g10/1 The annual cycle starts with a hormonal change in the spring, triggered by length of the day. Biologists call it ‘photoperiodism’.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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n.1920- check a bowline
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