phytochrome
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phy·to·chrome
(fī′tə-krōm′)n.
Any of several photoreceptive pigments in green plants that regulate processes such as flowering and seed germination.
phytochrome
(ˈfaɪtəʊˌkrəʊm)n
(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
phy•to•chrome
(ˈfaɪ təˌkroʊm)n.
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.
[1890–95]