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 (By similarity). Involved in defense responses to pathogenic bacteria (e.g. P.syringae pv. maculicola) (PubMed:21199889). Interacts with the exocyst subunits EXO70B2, SEC3A, SEC5A and SEC15B (PubMed:21199889). Subunit of the exocyst complex that mediates vesicle tethering during exocytosis (Probable). Localized in the vesicle-like structures in a peri-nuclear and nuclear pattern. Mostly expressed in roots and, to a lower extent, in leaves, flower buds and siliques. In roots, localized in elongation and root hair zones. In flowers, observed in carpels. Induced by elicitor peptides elf18 and flg22, by the fungus B.graminis hordei and by the bacterium P.syringae. No discernible phenotype in normal conditions (PubMed:21199889). Enhanced susceptibility to the bacterial pathogen P.syringae pv. maculicola (PubMed:21199889). Belongs to the EXO70 family. Truncated N-terminus.