This experiment was made in the University of Illinois at Urbana-Champaign. By measurement of pericarp thickness for 26 inbreds or crosses (genotypes Su, su,sh2 and suse)18,22 and 26 days after pollination (DAP),the results were as follows.

• 通过对26份玉米材料（基因型为Su，su，sh2，suse）授粉后18d、22d和26d测定果皮厚度，得到4个重要结果；