Regulation of Flowering Time byArabidopsisPhotoreceptors

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Abstract
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 theArabidopsis thaliana CRY2gene encoding a blue-light receptor apoprotein (CRY2) is allelic to the late-flowering mutant,fha. Flowering incry2/fhamutant plants is only incompletely responsive to photoperiod. Cryptochrome 2 (cry2) is a positive regulator of the flowering-time geneCO, the expression of which is regulated by photoperiod. Analysis of flowering incry2andphyBmutants in response to different wavelengths of light indicated that flowering is regulated by the antagonistic actions of phyB and cry2.