Involved in biosynthesis of the epicuticular wax. Plays a role in very-long-chain fatty acid (VLCFA) biosynthesis and is required for C30 fatty acid elongation in leaf. Despite its classification as a BAHD acyltransferase based on sequence homology, CER26 does not seem to share the catalytic mechanism of the members of the BAHD family. Highly expressed in leaves. No visible phenotype under normal growth conditions, but mutant plants have increased levels of C29 alkane and reduced levels of C31 alkane in the rosette leaf wax. Belongs to the plant acyltransferase family.