Enhancement of blue-light sensitivity of Arabidopsis seedlings by a blue light receptor cryptochrome 2.
Cryptochrome is a group of flavin-type blue light receptors that regulate plant growth and development. The function of Arabidopsis cryptochrome 2 in the early photomorphogenesis of seedlings was studied by using transgenic plants overexpressing CRY2 protein, and cry2 mutant plants accumulating no CRY2 protein. It is found that cryptochrome 2 mediates blue light-dependent inhibition of hypocotyl elongation and stimulation of cotyledon opening under low intensities of blue light. In contrast to CRY1, the expression of CRY2 is rapidly down-regulated by blue light in a light-intensity dependent manner, which provides a molecular mechanism to explain at least in part that cryptochrome 2 functions primarily under low light during the early development of seedlings.
Lin
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Department of Molecular, Cell and Developmental Biology, and Molecular Biology Institute, University of California, Los Angeles, CA 90095, USA. clin@mcdb.ucla.edu
Yang
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H
Guo
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Mockler
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Chen
J
J
Cashmore
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AR
D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000502:physiology* / Q000528:radiation effects; D029681:Arabidopsis Proteins; D056931:Cryptochromes; D004255:Deoxyribodipyrimidine Photo-Lyase / Q000737:chemistry; D029721:Drosophila Proteins; D004926:Escherichia coli / Q000201:enzymology; D005136:Eye Proteins; D005420:Flavoproteins / Q000096:biosynthesis / Q000737:chemistry / Q000502:physiology*; D018546:Hypocotyl; D008027:Light; D008029:Lighting; D008969:Molecular Sequence Data; D017956:Photoreceptor Cells, Invertebrate; D010940:Plant Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000502:physiology*; D043562:Receptors, G-Protein-Coupled; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
D029681:Arabidopsis Proteins; C538962:CRY1 protein, Arabidopsis; D056931:Cryptochromes; D029721:Drosophila Proteins; D005136:Eye Proteins; D005420:Flavoproteins; D010940:Plant Proteins; D043562:Receptors, G-Protein-Coupled; C119828:cry protein, Drosophila; D004255:Deoxyribodipyrimidine Photo-Lyase