Component of an exocyst subcomplex specifically involved in autophagy-related, Golgi-independent membrane traffic to the vacuole. Regulates autophagosome formation and autophagy-related Golgi-independent import into the vacuole. Positive regulator of both abscisic acid (ABA)-promoted and mannitol (drought)-promoted stomatal closure (PubMed:27956469). Interacts with EXO70B2, SEC5A AND EXO84B (PubMed:23944713). Binds to PUB18 (PubMed:27956469). Displays a punctate pattern. Colocalizes with PUB18. Target of the E3 ubiquitin-protein ligase PUB18 that mediates its ubiquitination and degradation via the 26S proteasome. Twisted leaves with small spontaneous lesions, early yellowing of leaves and anthocyanin accumulation defects. Chlorotic shoots. Retarded growth with wrinkled rosette leaves under long-day growth conditions. Impaired abscisic acid (ABA)-mediated and mannitol (drought)-promoted stomatal closure (PubMed:27956469). Belongs to the EXO70 family.