Esterifies acyl-group from acyl-ACP to the sn-2 position of glycerol-3-phosphate, a step in cutin biosynthesis. an acyl-CoA + sn-glycerol 3-phosphate = a 2-acyl-sn-glycerol 3-phosphate + CoA Specifically expressed in flower buds. The HXXXXD motif is essential for acyltransferase activity and may constitute the binding site for the phosphate moiety of the glycerol-3-phosphate. Belongs to the GPAT/DAPAT family.