phytochrome

[fahy-tuh-krohm]
noun Botany.
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.

Origin:
1890–95; phyto- + -chrome

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World English Dictionary
phytochrome (ˈfaɪtəʊˌkrəʊm)
 
n
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

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American Heritage
Science Dictionary
phytochrome   (fī'tə-krōm')  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for phytochrome
Phytochrome is a photoreceptor, a pigment that plants use to detect light.
Biochemically, phytochrome is a protein with a bilin chromophore.
A pigment of the imagination a history of phytochrome research.
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