Fuente: WIPO "biotechnology" Light-regulated promoter sequences were identified that respond to differential light conditions and so can be used to regulate gene expression in a light- or dark-inducible manner. These promoters may be used to produce transgenic plants that have an altered trait relative to control plants. In preferred embodiments, the transgenic plants with the improved traits are morphologically and/or developmentally similar to control plants (examples of the latter include wild-type or non-transformed plants of the same species). Any of these light-regulated promoters may be incorporated into a nucleic acid construct that comprises a polynucleotide regulated by one such promoter and that encodes a polypeptide or RNA molecule that, when ectopically expressed, confers an improved trait in plants.