Involved in the esterification of cycloartenol. Not implicated in the formation of sterol esters in flowers or during seed maturation. Has a substrate preference toward saturated fatty acyl donors (16:0 > 18:0 > 16:1 > 18:1). Does not require triacyglycerols (TAGs) as a fatty acyl donor, and is unable to acylate diacylglycerol to produce TAG. Increased expression during seed development and as pollen development proceeded from uninucleate microspore to mature pollen. No visible phenotype. Belongs to the wax synthase family.