Involved in biosynthesis of the epicuticular wax. Plays a role in very-long-chain fatty acid (VLCFA) biosynthesis and is required for C28 fatty acid elongation in stem. Despite its classification as a BAHD acyltransferase based on sequence homology, CER2 does not seem to share the catalytic mechanism of the members of the BAHD family. Expressed at high levels in the epidermis of stems and young siliques. Expressed in flowers. Bright green and glossy stems and siliques due to low abundance of cuticular wax. Increased levels of C26 and C28 alcohols and disappearance of C29 alkane and C30 alcohol in the stem wax. Belongs to the plant acyltransferase family.