Fig. 2. Scanning electron micrographs of topless seedlings. (A) Wild-type seedling. (B) topless mutant seedling with a single cotyledon and no shoot apical meristem. (C) topless mutant seedling with a cup-shaped cotyledon and no SAM. (D) topless mutant seedling lacking cotyledons and SAM. (E) topless mutant seedling with apical root replacing the shoot apical meristem and cotyledons. (F) Close-up of apical root. (G) topless seedling with mixed fates. Root hairs are present on a reduced cotyledon. h, hypocotyl; c, cotyledon; a, apical root; b, basal root; rh, root hairs. Scale bar: 0.2 mm in A and C; 0.37 mm in B and E; 0.43 mm in D and G; 0.1 mm in F.
