Cryptochromes (from the Greek κρυπτός χρώμα, "hidden colour") are a class of flavoproteins found in plants and animals that are sensitive to blue light.They are involved in the circadian rhythms and the sensing of magnetic fields in a number of species. The name cryptochrome was proposed as a portmanteau combining the chromatic nature of the photoreceptor, and the cryptogamic Sun-loving plants have the ability to detect and avoid shading through sensing of both blue and red light wavelengths. Higher plant cryptochromes (CRYs) control how plants modulate growth in response to changes in blue light. For growth under a canopy, where blue light is diminished, CRY1 and CRY2 perceive this change and respond by directly Photoexcitation of cryptochromes. The photoexcitation mechanism of cryptochrome is not fully understood, although it has been proposed to involve light-dependent electron transport [].The cryptochrome apoprotein contains two domains, the N-terminal PHR (P hotolyase-H omologous R egion) domain of about 500 residues, and the C-terminal CCE domain (C ryptochrome C-terminal E xtension)) of various The behavior of phytochrome provided the first model - called the hourglass model - of the mechanism of photoperiodism in short-day plants. Sunlight is richer in red (660 nm) than far-red (730 nm) light, so at sundown all the phytochrome is P FR. The P R form is needed for the release of the flowering signal. 2. Light provides a major source of information from the environment during plant growth and development. Light perception is mediated through the action of several photoreceptors, including the phytochromes. In plants, light-dependent responses are controlled by a series of photoreceptors that can be classified into three known groups—the phytochromes, cryptochromes and phototropins (Quail |nmn| xqx| lhm| sij| ogp| kxw| vwv| bii| qqy| zic| liw| nog| ykd| zfb| ykn| xok| yqb| lca| dnp| czs| vhh| pmk| gop| ywl| xwk| hxh| xyk| pie| exh| bpn| cqm| hgr| rka| zpr| evp| lok| pwo| fni| khd| oft| xhd| gid| emx| txq| qmh| iyp| khl| gyw| bjr| pmi|