1. Crop Science Dep.; North Carolina State Univ.; Raleigh NC 27695-7620
2. Agronomy Dep.; Univ. Estadual de Londrina; Londrina PR Brazil
3. Center for Applied Genetic Technologies, Dep. of Crop and Soil Sci.; Univ. of Georgia; Athens GA
4. USDA-ARS; 3127 Ligon Street Raleigh NC 27607