. "Catalysis of the reaction: 1,2-diacyl-sn-glycerol + UDP-D-galactose = 1,2-diacyl-3-beta-D-galactosyl-sn-glycerol + H(+) + UDP." . . "1,2-diacylglycerol 3-beta-galactosyltransferase activity" . "1-beta-MGDG activity" . "1beta-MGDG" . "MGDG synthase activity" . "monogalactosyldiacylglycerol synthase activity" . "UDP galactose-1,2-diacylglycerol galactosyltransferase activity" . "UDP-galactose-diacylglyceride galactosyltransferase activity" . "UDP-galactose:1,2-diacyl-sn-glycerol 3-beta-D-galactosyltransferase activity" . "UDP-galactose:diacylglycerol galactosyltransferase activity" . "UDPgalactose:1,2-diacylglycerol 3-beta-D-galactosyltransferase activity" . "uridine diphosphogalactose-1,2-diacylglycerol galactosyltransferase activity" . . .