Involved in triacylglycerol (TAG) synthesis. Catalyzes the acylation of the sn-3 hydroxy group of sn-1,2-diacylglycerol using acyl-CoA. Can use oleoyl-CoA and linoleoyl-CoA as substrates. May play a role in TAG biosynthesis in different tissues in responses to environmental and hormonal cues. a 1,2-diacyl-sn-glycerol + an acyl-CoA = a triacyl-sn-glycerol + CoA Highly expressed in flowers and seeds. Expressed at low levels in roots, stems, leaves and pods. Induced by heat shock, cold stress, insect biting and abscisic acid (ABA). Down-regulated by treatment with jasmonate. Belongs to the diacylglycerol acyltransferase family.