SP3 and DEP1 Orchestrate Panicle Architecture by Jointly Regulating APO2 Expression in Rice.

ABSTRACT: Panicle architecture is largely determined by meristem activity. This previous study shows that DNA binding with one finger (Dof) transcription factor Short Panicle 3 (SP3) regulates panicle architecture. However, the molecular mechanisms of SP3 controlling panicle architecture remain largely unknown. Here, SP3 is shown to enhance inflorescence meristem (IM) activity. Histological analysis shows that IM size rather than the timing of the meristem transition significantly reduces in SP3 mutants. Several assays reveal that SP3 interacts with the C-terminal cysteine-rich domain of DENSE AND ERECT PANICLE1 (DEP1), a class C Gγ subunit, thereby regulating its plasma membrane-nucleus shuttle. SP3 directly binds to the cis element (A/T)AAAG located within the -561 to -517 bp region upstream of th

SUBMITTER: Liu Y 

PROVIDER: S-EPMC12667520 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature