1. Collaborative Innovation Team of Shandong Wheat-Corn Crops, National Key Lab. of Crop Biology, Key Lab. of Crop Ecophysiology and Farming System, Ministry of Agriculture Agronomy College of Shandong Agricultural Univ. Tai'an 271018 Shandong P.R. China
2. Life Science and Technology College Nanyang Normal Univ. Nanyang 473061 He'nan P.R. China