1. Agriculture and Agri-Food Canada, Cereal Research Centre, 195 Dafoe Road, Winnipeg, MB, Canada R3T 2M9. Contribution No. 1735.
2. Corresponding author. E-mail: names@em.agr.ca.
3. Agriculture and Agri-Food Canada, Semiarid Prairie Agricultural Research Centre, 1 Airport Road, P.O. Box 1030, Swift Current, SK, Canada S9H 3X2.
4. Canadian Grain Commission, Grain Research Laboratory, 1404-303 Main St., Winnipeg, MB, Canada R3C 3G8.