Fig.3. Diagram of cell lineages during early anther developmentACD: Asymmetric cell division; Ar: Archesporial cell; C: Connective tissue; E: Epidermis; En: Endothecium; L2-d: L2-derived cell; ML: Middle layer; PPC: Primary parietal cell; SCD: Symmetric cell division; Sp: Sporogenous cell; SPC: Secondary parietal cell; T: Tapetum |