1. National Research Council Canada, Plant Biotechnology Institute, 110 Gymnasium Place, Saskatoon, SK, S7N 0W9, Canada.
2. University of Saskatchewan, Crop Development Centre, 51 Campus Drive, Saskatoon, SK, S7N 5A8, Canada.
3. Corresponding author: Fax: 306-975-4839. Email: rchibbar@pbi.nrc.ca