Phytochrome
Phytochrome
Phytochrome (pronounced: /ˈfaɪtoʊkroʊm/) is a type of photoreceptor in plants that is sensitive to light in the red and far-red region of the visible spectrum.
Etymology
The term "phytochrome" is derived from the Greek words "phyto" meaning plant and "chrome" meaning color.
Function
Phytochromes play a crucial role in photomorphogenesis, the growth and development of plants in response to light. They are involved in various physiological processes including seed germination, stem elongation, leaf expansion, and the timing of flowering.
Structure
Phytochromes are composed of a protein part and a non-protein part, known as the chromophore. The chromophore absorbs light and causes a conformational change in the phytochrome protein, leading to changes in the plant's growth and development.
Types
There are two types of phytochromes: Phytochrome A (PhyA) and Phytochrome B (PhyB). PhyA is most sensitive to light in the far-red region, while PhyB is most sensitive to red light.
Related Terms
External links
- Medical encyclopedia article on Phytochrome
- Wikipedia's article - Phytochrome
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