A plant chromoprotein involved in the regulation of light-dependent growth processes.
a light-sensitive pigment found within the plant cell. Phytochromes are involved in a number of light-related events, such as seasonal flowering, but are not considered hormones.
A reversible pigment occurring in green plants that changes form in response to exposure to light and dark, permitting plants to measure the length of the dark period.
(fy´ tow krome) [Gr. phyton: plant + chroma: color] • A plant pigment regulating a large number of developmental and other phenomena in plants; can exist in two different forms, one of which is active and the other is not. Different wavelengths of light can drive it from one form to the other.
FI-toe-krome A pale blue plant pigment that promotes flowering of long-day plants and inhibits flowering of short-day plants. 585
pigment in plants in small concentrations that exists in two photoreversible forms, the red form and the far-red form.
A pigment protein from plants that absorbs red light.
A pigment in plant leaves that detects day length and generates a response; partly responsible for photoperiodism.
A pigment in the leaves of African Violets and other plants which, when exposed to light, activates the production of florigen.
A light-sensitive pigment. Its controlled activation and inactivation affect plant hormone activities that govern leaf expansion, stem branching, stem lengthening, and often seed germination and flowering.
Phytochrome is a photoreceptor, a pigment that plants use to detect light. It is sensitive to light in the red and far-red region of the visible spectrum. Many flowering plants use it to regulate the time of flowering based on the length of day and night (photoperiodism) and to set circadian rhythms.