Abstract
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.
Publication types
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Comparative Study
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Amino Acid Sequence
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Arabidopsis / physiology*
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Arabidopsis / radiation effects
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Arabidopsis Proteins
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Cryptochromes
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Deoxyribodipyrimidine Photo-Lyase / chemistry
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Drosophila Proteins*
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Escherichia coli / enzymology
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Eye Proteins*
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Flavoproteins / biosynthesis
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Flavoproteins / chemistry
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Flavoproteins / physiology*
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Hypocotyl
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Light
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Lighting
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Molecular Sequence Data
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Photoreceptor Cells, Invertebrate*
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Plant Proteins / biosynthesis
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Plant Proteins / chemistry
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Plant Proteins / physiology*
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Receptors, G-Protein-Coupled
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Sequence Alignment
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Sequence Homology, Amino Acid
Substances
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Arabidopsis Proteins
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CRY1 protein, Arabidopsis
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Cryptochromes
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Drosophila Proteins
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Eye Proteins
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Flavoproteins
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Plant Proteins
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Receptors, G-Protein-Coupled
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cry protein, Drosophila
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Deoxyribodipyrimidine Photo-Lyase