phy·to·chrome (f  t -kr m )n. A cytoplasmic pigment of green plants that absorbs light and regulates dormancy, seed germination, and flowering. |
phytochrome [ˈfaɪtəʊˌkrəʊm]
n
(Life Sciences & Allied Applications / 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
| phytochrome (ft-krm) Any of a group of cytoplasmic pigments found in green plants and some green algae that absorb red light and regulate dormancy, seed germination, and flowering. Phytochromes consist of a bile pigment attached to a protein, and occur in an active and inactive form, each of which can be converted into the other depending on the wavelength of red light that is absorbed. |
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