PT - JOURNAL ARTICLE AU - Guo, Hongwei AU - Yang, Hongyun AU - Mockler, Todd C. AU - Lin, Chentao TI - Regulation of Flowering Time by <em>Arabidopsis</em> Photoreceptors AID - 10.1126/science.279.5355.1360 DP - 1998 Feb 27 TA - Science PG - 1360--1363 VI - 279 IP - 5355 4099 - http://science.sciencemag.org/content/279/5355/1360.short 4100 - http://science.sciencemag.org/content/279/5355/1360.full SO - Science1998 Feb 27; 279 AB - The shift in plants from vegetative growth to floral development is regulated by red–far-red light receptors (phytochromes) and blue–ultraviolet A light receptors (cryptochromes). A mutation in the Arabidopsis thaliana CRY2 gene encoding a blue-light receptor apoprotein (CRY2) is allelic to the late-flowering mutant, fha. Flowering in cry2/fha mutant plants is only incompletely responsive to photoperiod. Cryptochrome 2 (cry2) is a positive regulator of the flowering-time gene CO, the expression of which is regulated by photoperiod. Analysis of flowering in cry2 and phyB mutants in response to different wavelengths of light indicated that flowering is regulated by the antagonistic actions of phyB and cry2.