1. Department of Plant Breeding, IFZ Research Centre for Biosystems, Land Use and Nutrition; Justus Liebig University; 35392 Giessen Germany
2. National Research Council of Canada; Aquatic and Crop Resource Development; Saskatoon Saskatchewan S7N 0W9 Canada
3. Department of Chemistry; University of Saskatchewan; Saskatoon Saskatchewan S7N 5C9 Canada
4. UMR 1349 INRA-AgroCampus Ouest-Université de Rennes 1; Joint Laboratory for Genetics, Environment and Plant Protection (IGEPP); Bât. 301, BP 35327 35653 Le Rheu Cedex France