1. USDA-ARS Southern Regional Research Center, P.O. Box 19687, New Orleans, LA 70179.
2. Corresponding author. Phone: 504-286-4448. Fax: 504-286-4430. E-mail: elaine.champagne@ars.usda.gov
3. Grain Quality, Nutrition and Postharvest Centre, International Rice Research Institute, DAPO 7777, Metro Manila, Philippines.