1. Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164, U.S.A.
2. National Institute of Crop Science, Rural Development Administration, Iksan, Republic of Korea.
3. USDA-ARS, Corn, Soybean and Wheat Quality Research Unit, Soft Wheat Quality Laboratory, Wooster, OH 44691, U.S.A.
4. Corresponding author. Phone: (330) 263-3891. Fax: (330) 263-3651. E-mail: byungkee.baik@ars.usda.gov