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1: Proc Natl Acad Sci U S A. 1998 Mar 3;95(5):2686-90.Click here to read Click here to read Links

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

Lin C, Yang H, Guo H, Mockler T, Chen J, Cashmore AR.

Department of Molecular, Cell and Developmental Biology, and Molecular Biology Institute, University of California, Los Angeles, CA 90095, USA. clin@mcdb.ucla.edu

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.

PMID: 9482948 [PubMed - indexed for MEDLINE]

PMCID: PMC19462