photoperiodicityn.
/ˌfəʊtə(ʊ)pɪərɪəˈdɪsᵻti/, U.S. /ˈˌfoʊdoʊˌpɪriəˈdɪsᵻdi/ = photoperiodism n. Also: the regular cycle of changes in day length to which photoperiodism is a response.
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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
1926 Ecology 7 315 (title) The change of opposite to alternate phyllotaxy and repeated rejuvenations in hemp by means of changed photoperiodicity.
1936 Q. Rev. Biol. 11 373/2 It is open to question whether they are true cases of sexual photoperiodicity.
1986 J. A. Samson Trop. Fruits (ed. 2) vii. 197 Collins..stated that pineapples, being native to the tropics, show almost no photoperiodicity. The inference that all tropical plants are insensitive to daylength, is incorrect.
1996 Outdoor Life (Nexis) Dec. 70 North America is home to more than 30 different whitetail subspecies,..each responding in subtly different ways to photoperiodicity.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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