Fig. 3

Transmission electron microscopy of anthers from wild-type and sa1 plants. Early uninucleate stage anthers are shown in (a) to (h): wild-type (a) and sa1 anthers (b); tapetal layers in wild type (c) and sa1 (d); Ubisch bodies in wild type (e) and sa1 (f); Microspores in wild type (g) and sa1 (h). Late uninucleate stage anthers are shown in (i) to (p): wild-type (i) and sa1 anthers (j); tapetal layers in wild type (k) and sa1 (l); Ubisch bodies in wild type (m) and sa1 (n); microspores in wild type (o) and sa1 (p). Binucleate stage anthers are shown in (q) to (t): wild-type (q) and sa1 anthers (r); Ubisch bodies in wild type (s) and sa1 (t). Bar = 10 μm in (a), (b), (g), (h), (i), (j), (o), (p), (q), and (r); 1 μm in (c), (d), (k), and (l); 500 nm in (e), (f), (m), (n), (s), and (t). DER, degenerated endoplasmic reticulum; DMsp, degenerated microspores; E, epidermis; En, endothecium; ER, endoplasmic reticulum; M, mitochondria; ML, middle layer; Msp, microspores; T, tapetal layer; Ub, Ubisch body; Va, vacuole