Summary
Phytochromes are the best characterized plant photoreceptors. They are responsible for a wide range of photomorphogenic events ranging from seed germination, de-etiolation, and shade-avoidance responses to flowering. Many of these responses include the induction and subsequent regulation of genes encoding the photosynthetic components. The availability of mutants defective in individual phytochromes has now revealed which phytochromes are responsible for specific physiological responses. New molecular methods have revolutionized our understanding of the precise mode of action of the phytochromes, which have shattered many of the traditional dogmas. For example, phytochrome has now been demonstrated to have serine/ threonine (Ser/Thr) protein kinase activity and to be translocated from the cytoplasm to the nucleus in a light-regulated manner. Several phytochrome-interacting proteins have now been identified, most of which are nuclear localized. Integration of these new downstream-interacting proteins into the signaling pathways, previously proposed by biochemical and genetic studies, reveals a highly sophisticated signal transduction circuitry that can allow the parallel function of both cytoplasmic- and nuclear-localized components.
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Malakhov, M., Bowler, C. (2001). Phytochrome and Regulation of Photosynthetic Gene Expression. In: Aro, EM., Andersson, B. (eds) Regulation of Photosynthesis. Advances in Photosynthesis and Respiration, vol 11. Springer, Dordrecht. https://doi.org/10.1007/0-306-48148-0_3
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