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Summary  Heading date is a key agronomic trait affecting crop yield. In rice, Early heading date 1 (Ehd1) is an important B‐type response regulator in determination of heading date. Although many regulatory factors of  Ehd1  expression have been functionally characterized, the direct regulators of  Ehd1  largely remain to be identified. Here, we identified a new regulator of  Ehd1 , OsRE1, that directly binds to the A‐box motif in the  Ehd1  promoter.  Osre1  confers an early heading phenotype due to elevated expression levels of  Ehd1 . OsRE1 is a nucleus‐localized bZIP transcription factor with a diurnal rhythmic expression pattern. Furthermore, we identified an OsRE1‐interacting protein, OsRIP1, and demonstrated that OsRIP1 can repress the transcript expression of  Ehd1  in an OsRE1‐dependent manner. Our genetic data showed that OsRE1 and OsRIP1 may function upstream of  Ehd1  in regulating heading date. Together, our results suggest that OsRE1 functions cooperatively with OsRIP1 to regulate heading date through finely modulating the expression of  Ehd1 . In addition, OsRE1 and OsRIP1 are two minor heading date regulators, which are more desirable for fine‐tuning heading date to improve rice regional adaptability.

OsRE1 interacts with OsRIP1 to regulate rice heading date by finely modulating Ehd1 expression