Plant blue-light receptors.
Plants have several blue-light receptors, which regulate different aspects of growth and development. Recent studies have identified three such receptors: cryptochrome 1, cryptochrome 2 and phototropin. Cryptochromes 1 and 2 are photolyase-like receptors that regulate hypocotyl growth and flowering time; phototropin mediates phototropism in response to blue light. In addition, phytochrome A has also been found to mediate various blue-light responses. Although the signal-transduction mechanisms of blue-light receptors remain largely unclear, phototropin is probably a protein kinase that regulates cytoplasmic calcium concentrations, whereas the cryptochromes might regulate anion-channel activity and changes in gene expression.
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Dept of Molecular, Cell and Developmental Biology, University of California, Los Angeles, 621 C. Young Dr. South, Los Angeles, CA 90095-1606, USA. clin@mcdb.ucla.edu
D017360:Arabidopsis / Q000378:metabolism; D029681:Arabidopsis Proteins; D056931:Cryptochromes; D029721:Drosophila Proteins; D005136:Eye Proteins; D005420:Flavoproteins / Q000378:metabolism*; D008027:Light; D017956:Photoreceptor Cells, Invertebrate; D010944:Plants / Q000378:metabolism*; D043562:Receptors, G-Protein-Coupled; D015398:Signal Transduction
D029681:Arabidopsis Proteins; C538962:CRY1 protein, Arabidopsis; D056931:Cryptochromes; D029721:Drosophila Proteins; D005136:Eye Proteins; D005420:Flavoproteins; D043562:Receptors, G-Protein-Coupled; C119828:cry protein, Drosophila