1. School of Food Science, Washington State University, Pullman, WA 99164, U.S.A.
2. Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164, U.S.A.
3. Corresponding author. Phone: (509) 335-8230. Fax: (509) 335-8674. E-mail: bbaik@wsu.edu