1. Forage Seed and Cereal Research Unit, USDA Agricultural Research Service, Corvallis, OR, U.S.A.
2. Department of Biochemistry and Biophysics, Oregon State University, Corvallis, OR, U.S.A.
3. Department of Crop and Soil Science, Oregon State University, Corvallis, OR, U.S.A.
4. School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR, U.S.A.