Enhancement of blue-light sensitivity of Arabidopsis seedlings by a blue light receptor cryptochrome 2.

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.
Authors	C Lin, H Yang, H Guo, T Mockler, J Chen, A R Cashmore
Journal	Proceedings of the National Academy of Sciences of the United States of America (Proc Natl Acad Sci U S A) Vol. 95 Issue 5 Pg. 2686-90 (Mar 03 1998) ISSN: 0027-8424 [Print] United States
PMID	9482948 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)
Chemical References	Arabidopsis Proteins CRY1 protein, Arabidopsis Cryptochromes Drosophila Proteins Eye Proteins Flavoproteins Plant Proteins Receptors, G-Protein-Coupled cry protein, Drosophila Deoxyribodipyrimidine Photo-Lyase
Topics	Amino Acid Sequence Arabidopsis (physiology, radiation effects) Arabidopsis Proteins Cryptochromes Deoxyribodipyrimidine Photo-Lyase (chemistry) Drosophila Proteins Escherichia coli (enzymology) Eye Proteins Flavoproteins (biosynthesis, chemistry, physiology) Hypocotyl Light Lighting Molecular Sequence Data Photoreceptor Cells, Invertebrate Plant Proteins (biosynthesis, chemistry, physiology) Receptors, G-Protein-Coupled Sequence Alignment Sequence Homology, Amino Acid

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