tws1-1 phenotypic characterization. A, Wild-type (left) and tws1-1 (right) 3-week-old bolting plants. Scale bar = 2.5 cm. B and C, A wild-type (B) and a tws1-1 (C) 10-d-old seedling grown in vitro. Scale bars = 2 mm. D and E, A wild-type (D) and a tws1-1 (E) hypocotyl imaged with SEM. Scale bars = 100 µm. F, Wild-type (left) and tws1-1 (right) open silique. Scale bar = 2.5 mm. G and H, Wild-type (G) and tws1-1 (H) seeds. I and J, SEM images of a wild-type (I) and a tws1-1 (J) mature dry seed. Scale bars = 100 µm. K and L, Wild-type (K) and tws1-1 (L) 7-d-old seedlings grown in vitro on vertical plates. Scale bars = 2 mm.