sentence: From homology-based analysis of downstream-regulated genes OsCP1 , OsC6 , OsAP25 , OsAP37 , OsCYP703A3 , OsCYP704B2 , OsMS2 , OsACOS12 and OsABCG15 which are required for regulating tapetal PCD and biosynthesis of sporopollenin and cutin precursors , we found that all of them have orthologs in wheat .