1. Department of Agricultural, Food & Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, Canada.
2. Corresponding Author. Phone: +1-780-4922898. Fax: +1-780-4928914. E-mail: tv3@ualberta.ca.
3. Department of Biochemistry, Memorial University of Newfoundland, St. John's, NF A1B 3X9, Canada.
4. Crop Development Centre, University of Saskatchewan, Saskatoon, SK S7N 5A8, Canada.