1. Department of Plant Breeding, Swedish University of Agricultural Sciences (SLU), Lomma, Sweden
2. Nordic Genetic Resources Center (NordGen), Alnarp, Sweden
3. International Maize and Wheat Improvement Center (CIMMYT), Texcoco, Mexico
4. Colegio de Postgraduados, Montecillos, México
5. Universidad de Quintana Roo, Chetumal, México