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A working model on RGB1 regulation on grain filling. RGB1 may positively regulate expression of transcription factor OsNF-YB1 through unknown mechanism(s), which activates the OsYUC11 transcription by interacting with its promoter, and leads to an increase in auxin level. The increased auxin then stimulates the expression of sucrose metabolism and starch biosynthesis-related genes in endosperm cells, as a consequence, the biosynthesis of starch and grain filling.
