Vesicle trafficking protein that functions in the secretory pathway (Probable). Acts in coordination with SYP132 to mediate tip-focused membrane trafficking for root hair tip growth (PubMed:24642714). Functions in root hair elongation by forming SNARE complexes with VAMP721,VAMP722 or VAMP724 (PubMed:24642714). Part of the t-SNARE complex. Expressed in tips of root hairs. Reduced root hair length. Belongs to the syntaxin family.