1LI Zhao-hui, GUO Xing-qi, YE Bao-hua and GUO Yan-kui( College of Plant Protection , Shandong Agricultural University, Taian 271018 , P.R.China,College of Life Sciences , Shandong Agricultural University , Taian 271018 , P.R.China).Ultrastructural Alteration of Maize Plants Infected with the Maize Rough Dwarf Virus[J].Agricultural Sciences in China,2002,1(5):531-534.