Figure 4

TEM of the EFN in stage 3 of V. adenantha (ring). (A-B) The epidermal cells. (A) General view of cell with vacuole (va), cavities in the middle lamellae (ca) and ectodesmata (ec). (B) Detail of the outer tangential wall with highly electrondense content outside the invaginated plasmalemma (arrows), inside the ectodesmata, which also have vesicles (ve), and outside the wall (arrowhead). (C-F) Parenchyma cells. (C) Detail of invaginated plasma membrane and rough endoplasmic reticulum (rER). (D) Rough endoplasmic reticulum and amyloplasts (a). (E) Dictyosomes (d), lipidic globules (l) and mitochondria (m). (F) Plasmodesmata (p) connecting adyacent cells and vacuole with fibrilar content (va). Scale bars: (A, F) =2 μm; (B) =1 μm; (C-E) =200 nm.