Plants have several blue-light receptor, which regulate different aspects of growth and development. Recent studies have identified three such receptor: cryptochrome 1, cryptochrome 2 and phototropin. Cryptochromes 1 and 2 are photolyase-like receptor 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 receptor remain largely unclear, phototropin is probably a protein kinase that regulates cytoplasmic calcium concentrations, whereas the crypochromes might regulate anion-channel activity and changes in gene expression.
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