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Brassinosteroids(BRs),essential plant-specific steroidal hormones,function in a wide spectrum of plant growth and development events,including seed germination.Rice is not only a monocotyledonous model plant but also one of the most important staple food crops of human beings.Rice seed germination is a decisive event for the next-generation of plant growth and successful seed germination is critical for rice yield.However,little is known about the molecular mechanisms on how BR modulates seed germination in rice.