Fig. 1
From: Multiple functions of the vacuole in plant growth and fruit quality
Relationship between tonoplast proton pumps and vesicular trafficking of PIN1 protein. The polar localization of PIN1 protein depends on the vacuolar transport system. The basal-side transport of non-phosphorylated PIN1 protein depends on GNOM, and phosphorylated PIN1 protein moves to the apical region of the membrane. In mutants lacking tonoplast proton pumps, transport of PIN1 to the basal side is inhibited, demonstrating that the tonoplast proton pump affects the vesicular trafficking of PIN1, thereby influencing the polar transport of auxin