Fig. 2.

Ultrastructure of transmitting tissue in T. tenuifolium. a Exocytose of small vesicles (white arrows) in the transmitting tissue cells; ER cisternae (Er), dictyosomes (D), and extracellular matrix (exm). Bar = 0.6 μm. b Transverse section through an micropylar transmitting tissue cell; ER cisternae (Er), mitochondrion (m), nucleus (N), bar = 0.6 μm. c A part of a section through a micropyle near synergids; multivesicular bodies (MvB), micropylar transmitting tissue cell (Mtt), micropylar canal cell (mcc), bar = 1 μm. d A part of a section through subepidermal (sub) and micropylar transmitting tissue cells; plasmodesmata (black arrow), dictyosomes (D), ER cisternae (Er), nucleus (N), plastid (P), bar = 0.6 μm