photoregulatorn.
/ˌfəʊtəʊˈrɛɡjᵿleɪtə/, U.S. /ˌfoʊdoʊˈrɛɡjəˌleɪdər/ Biology.
A biological mechanism that regulates a process according to the duration, intensity, etc., of the light which it detects.
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photoregulator1959
1959 R. J. Downs in R. B. Withrow Photoperiodism ii. 129 The woody plant thus appears to be running two different systems with the same photoregulator.
1970 Nature 22 Aug. 778/1 Bieth et al. conjecture that carotenoids of animals and plants..might function as photoregulators, controlling diurnal and seasonal changes in metabolic levels.
1996 Proc. National Acad. Sci. U.S.A. 93 861/1 Substrates of this pathway include such critical regulatory proteins as the plant photoregulator phytochrome.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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n.1959