Required for transport of secretory proteins from the Golgi complex (By similarity). Catalyzes the transfer of phosphatidylinositol and phosphatidylcholine between membranes in vitro. Plays a role in root hair tip elongation as a key regulator of polarized membrane trafficking. May promote the PtdIns(4,5)P2 synthesis and organization in root hair membrane. Predominantly expressed in roots. Detected solely in root trichoblast cell files engaged in root hair growth, hydathodes, shoot apical meristem, and apical cells of the root cap. Exhibits short branched root hairs. Belongs to the SFH family.