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Brassinosteroids(BRs)are a group of naturally occurring plant hormones regulating many cellular and physiological processes during normal growth and development.cog1-2D was identified as an activation-tagged genetic modifier of an intermediate BR receptor mutant,bri1-5.COG1 encodes a Dof-type transcription factor.Previous studies suggested that COG1 negatively regulates phytochrome signaling pathway.