1. Universidad Autonoma ChapingoCarretera Mexico‐Texcoco km 38.5TexcocoEdo. de Mex. Mexico 56230
2. Dep. of AgronomyIowa State Univ. Ames IA 50011
3. Dep. of Food Science and Human NutritionIowa State Univ. Ames IA 50011
4. USDA‐ARSNational Small Grains Germplasm Research Facility P.O. Box 307 Aberdeen ID 83210
5. USDA‐ARS Plant Science Research UnitDep. of Crop Science, Box 7620North Carolina State Univ. Raleigh NC 27695‐7620