May function as a v-SNARE responsible for targeting vesicles involved in the secretory pathway (By similarity). Involved in actin-dependent endosomal trafficking pathways associated with the vacuole within root hairs and root tip epidermal cells (PubMed:24737717). Essential for cell wall organization and polarized root hair growth (PubMed:24737717). Also required for the localization of SYP41 to the trans-Golgi network in root hair cells (PubMed:24737717). Forms SNARE complexes with t-SNAREs. Present in a mobile endosomal compartment as well as in vacuolar 'bulb'-like structures. Expressed at low levels in roots, stems, flowers and leaves. Abnormal cell wall organization in root hair and root epidermal cells, probably due to altered endosomal trafficking, and leading to short and branched root hairs (PubMed:24737717). Mislocalization of SYP41 in root hair cells (PubMed:24737717). May be due to a competing acceptor splice site. Belongs to the VTI1 family.