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Light and brassinosteroid(BR)are two central stimuli that regulate plant photomorphogenesis.Although previous phenotypic and physiological studies have implied possible interactions between BR and light in regulating photomorphogenesis,the underlying molecular mechanism(s)remain largely unknown.In the present study,we identified a physical connection between the BR and light signaling pathways,which was mediated by the BR-regulated transcription factor BZR1 and the light-regulated transcription factor HY5 in Arabidopsis thaliana.