Involved in the incorporation of ferulate into the cell wall. May act as arabinoxylan feruloyl transferase (PubMed:20012086). May function as p-coumaroyl-CoA transferase involved in glucuronoarabinoxylan modification (PubMed:23391577). Reduced seed mass. The gain-of-function mutant OsAT10-D (T-DNA tagging) shows significant reduction of ferulate in leaf cell wall and strong increase p-coumarate in young leaf tissue but no discernible phenotypic alterations in vegetative development, lignin content, or lignin composition. Belongs to the plant acyltransferase family.