YANG Zong-qu~(1,2) YIN Jun~1 GU Dong-yan~1 ZHOU Ran~1 REN Jiang-ping~1 LI Yong-chun~1 LI Jin-cai~1(1.National Engineering Research Center for Wheat,Henan Agricultural University,Zhengzhou,Henan 450002;2.Isotope Institute,Henan Academy of Sciences,Zhengzhou,Henan\ 450002)