taimedes, bakterites, seentes esinevad punast ja kaugpunast valgust absorbeerivad fotoretseptorid
Phytochromes are a class of photoreceptor present in plants, bacteria and fungi used to detect light. They are sensitive to light in the red and far-red region of the visible spectrum. Linear tetrapyrrole, bound to a protein, acts as the chromophore.
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Kromofooriks on valguga seotud lineaarne tetrapürrool. Reguleerivad fotomorfogeneesi, õitsemist, idanemist, venimiskasvu, ööpäevaseid rütme.
