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