Characterization of grains in wild-type (WT) and pPP2::AtSUC2 rice plants. A, Comparisons of grains (top), brown rice (middle), and spikelets (bottom) in wild-type and four independent lines of pPP2::AtSUC2 (L6, L9, L26, and L51). Bars = 3 mm. B, Grain length, width, and thickness in wild-type and pPP2::AtSUC2 plants (n = 60 plants). C, Brown rice length, width, and thickness in wild-type and pPP2::AtSUC2 plants (n = 60 plants). D, Spikelet hull length and width just before heading in wild-type and pPP2::AtSUC2 plants (n = 60 plants). All data are given as means ± sd. Asterisks indicate significant difference from the wild type (*, P < 0.05; Student’s t test).