Journal of Northern Agriculture ›› 2007, Vol. ›› Issue (2): 68-68.
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LIU Hai-xia, LI Xiao-yan, LI Lian-guo, WANG Li-jun, LI Shao-hua (1.Agricuhural College, Inner Mongolia Agricultural University, Huhhot 010019,China; 2.Institute of Botany, Chinese Academy of Sciences, Beijing 100093,China)