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- W171056339 abstract "For vision to occur, light absorption is an absolute physical requirement. The array of photomorphogenic responses all has one thing in common: these processes are initiated only after photo excitation of a holoprotein. These holoproteins generally contain a polypeptide component and a small, light-absorbing ligand termed the chromophore. Plants have evolved an array of photoreceptor systems to detect the colour, intensity, direction, and periodicity of light. For this, a varying collection of polypeptides and associated chromophores are required. Not surprisingly, many of these receptors have been termed chromes, including the cryptic cryptochromes that detect ultra violet-B (UV-B) and blue (B) light (Lin and Shalitin, 2003), and the phyto (meaning plant) phytochromes that detect UV-B, B, red (R), and far-red (FR) light (Kevei and Nagy, 2003). Additional chromophore-bearing photoreceptors include the B-light detecting phototropins (Christie et al., 2002), the Zeitlupe family of B-light chromo proteins (Imaizumi et al., 2003), and two physiologically distinct systems that detect UV-B (Ulm et al., 2004). The protein component of these latter detection systems awaits identification (see Chapter 14). It should be noted that photosynthesis itself functions in light detection as a receptor, as light-induced redox changes in the plastid provide signalling information to the plant cell (Dietz, 2003). And finally, small molecule absorption of light is also detected by cells (Vladimirov, 1998), albeit as a photo-damage-sensing mechanism (see Chapter 14). Clearly, plants use an array of photochromic perception systems to optimise growth and development to all aspects of the ambient light environment (Sullivan and Deng, 2003). Of these higher-plant photochromic systems, the most thoroughly studied is the phytochrome family of chromoproteins. One extensively characterized group of plant photoreceptors are the R-absorbing and FR-absorbing phytochromes (phys) (see Chapter 7). This family of bilincontaining chromoproteins regulates development throughout the life cycle of plants. They play prominent roles in seed germination and de-etiolation, and control cotyledon, leaf, and stem size by regulating cell division and expansion. Phys also help plants perceive and respond to shading and crowding by neighbouring plants, entrain the circadian timer, and influence the seasonal timing of flowering. Ultimately, phys control plant senescence. Clearly phys control a diverse aspect of “ “" @default.
- W171056339 created "2016-06-24" @default.
- W171056339 creator A5091236793 @default.
- W171056339 date "2006-06-10" @default.
- W171056339 modified "2023-09-23" @default.
- W171056339 title "THE PHYTOCHROME CHROMOPHORE" @default.
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- W171056339 doi "https://doi.org/10.1007/1-4020-3811-9_5" @default.
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