1. Dep. of Crop ScienceBox 7631, North Carolina State Univ.RaleighNC27695‐7631
2. USDA‐ARS, and Dep. of Crop Science3127 Ligon St., Box 7631, North Carolina State Univ.RaleighNC27695‐7631
3. Dep. of GeneticsBox 7614, North Carolina State Univ.RaleighNC27695‐7614