1. Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, Saskatchewan, Canada, S7H 5A8
2. Crop Development Centre, University of Saskatchewan, 51 Campus Drive, Saskatoon, Saskatchewan, Canada, S7H 5A8
3. Corresponding author. Phone: (306) 966-4969. Fax: (306) 966-5015. E-mail: ravi.chibbar@usask.ca