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Plant heterotrimeric G proteins have been shown to regulate the size of various organs. There are three types of Gγ subunits in plants: type A, consisting of a canonical Gγ domain; type B, possessing a plant-specific domain at the N-terminus of the Gγ domain; and type C, possessing a plant-specific domain at the C-terminal of the Gγ domain. There is one type A, one type B, and three type C of the five γ-subunits in the rice genome. In type C Gγ subunits, GS3, which controls grain size; DEP1, which controls plant height and panicle branching; and their homolog OsGGC2, which affects grain size, have been reported; however, the function of each gene, their interactions, and molecular mechanisms for the control of plant height have not yet been clarified. In this study, we generated loss-of-function mutants of DEP1 and OsGGC2, which have high homology and similar expression, and investigated their phenotypes. Since both dep1 and osggc2 mutants were dwarfed and the double mutants showed a synergistic phenotype, we concluded that both DEP1 and OsGGC2 are positive regulators of plant height and that their functions are redundant.

OsGGC2, Gγ Subunit of Heterotrimeric G Protein, Regulates Plant Height by Functionally Overlapping with DEP1 in Rice