Development of CAPS Markers and Allele-specific PCR Primers in Citrus Development of CAPS Markers and Allele-specific PCR Primers in Citrus Expression of special genes resistant to powdery mildew (Blumeria graminis f. sp. tritici) in wheat germplasm N9820 WU Jin-Hua1, MA Zhi-ying1, Zhang Xi-ping2, JI Wan-quan3(1College of Agronomy, Agricultural University of , Baoding 071001,China; 2Institute of Urban and Rural Construction, Agricultural University of Hebei, Baoding 071001, China; 3College