Major contributors to triacylglycerol (TAG) synthesis and oil accumulation in developing seeds. Catalyzes the acylation of the sn-3 hydroxy group of sn-1,2-diacylglycerol using acyl-CoA. Has a marked preference for oleoyl-CoA and sn-1,2-dioleoylglycerol over vernoloyl-CoA and sn-1,2-divernoloylglycerol. a 1,2-diacyl-sn-glycerol + an acyl-CoA = a triacyl-sn-glycerol + CoA Glycerolipid metabolism; triacylglycerol biosynthesis. Highly expressed in flowers and pods. Expressed at low levels in roots, stems and leaves. During seed development, expressed from 30 to 65 days after flowering (DAF), with a peak at 50 DAF. Belongs to the membrane-bound acyltransferase family. Sterol o-acyltransferase subfamily.