1. Crop Science Dep.North Carolina State Univ. Raleigh NC 27695
2. Dep. of Biology and Health ScienceMeredith College Raleigh NC 27607
3. USDA‐ARSOilseeds and Bioscience Program Beltsville MD 20705
4. USDA‐ARSNorth Carolina State Univ. Raleigh NC 27695