Figure 11.

Working Model to Explain the Current Data Available on VSR Trafficking in Plants.

A simplified schematic of organelles and transport routes to the vacuole is shown. Organelles included are the ER, the Golgi apparatus, the partially coated reticulum or TGN, the PM, the PVC, the LPVC, and the vacuole. Known and unknown transport carriers are indicated in the boxed area. Dotted lines refer to pathways for which alternative routes cannot be excluded at present due to insufficient data. We consider two alternative or complementary biosynthetic routes to the PVC (A1 and A2). Likewise, two alternative routes must be considered for exocytosis at the PM (B1 and B2) and endocytosis from the PM (C1 and C2). The recycling route of the VSR is not shown.