Abstract
The phytochromes and related prokaryotic photoreceptors utilise a linear tetrapyrrole chromophore to monitor the surrounding light environment. They are found in most photosynthetic organisms, and also some nonphotosynthetic bacteria from which they most likely evolved. A key feature of the phytochromes is that they respond to light in a photoreversible manner. In plants, red light leads to the formation of Pfr, the physiologically-active phytochrome species, while far-red light reverses this process to give the Pr form. Prokaryotic phytochromes are also photoreversible, and are thought to be involved in regulating processes such as chromatic adaptation, phototaxis and pigment synthesis. In the model plant Arabidopsis thaliana there are five phytochromes that are involved in regulating all stages of plant development from germination to flowering. They also play a key role in chloroplast development and the regulation of the tetrapyrrole pathway.
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Terry, M.J., McCormac, A.C. (2009). Phytochromes:. In: Tetrapyrroles. Molecular Biology Intelligence Unit. Springer, New York, NY. https://doi.org/10.1007/978-0-387-78518-9_13
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DOI: https://doi.org/10.1007/978-0-387-78518-9_13
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