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Related to Phytochrome a: cytokinin, ethylene, auxin, chlorophyll, photoperiodism


Any of several photoreceptive pigments in green plants that regulate processes such as flowering and seed germination.


(Botany) botany a blue-green pigment existing in two interchangeable forms, present in most plants, that mediates many light-dependent processes, including photoperiodism and the greening of leaves


(ˈfaɪ təˌkroʊm)

a plant pigment that is associated with the absorption of light in the photoperiodic response and that may regulate various types of growth and development.
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2003 HFR1, a putative bHLH transcription factor, mediates both phytochrome A and cryptochrome signaling.
Seoul, Korea) has patented modified phytochrome A (PHYA) nucleic acid molecules in which Pr absorption spectra have been shifted to longer wavelength (i.
REP1, a basic helix-loop-helix protein, is required for a branch pathway of phytochrome A signaling in Arabidopsis.