plant pigment protein that absorbs red light and then initiates physiological responses governing light sensitive processes such as germination, growth and flowering. Exists in two forms, pr and pfr, that are interconverted by light. A plant pigment that exists between two forms, [[phytochrome 660 and [[phytochrome 725. They switch between one or the other depending on what time of the day it is, daytime or night time.

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