1. National Crops Resources Research Institute (NaCRRI), P.O. Box, 7084 Kampala, Uganda
2. School of Integrative Plant Science, Plant breeding and Genetics Section, Cornell University, Ithaca, New York
3. International Institute for Tropical Agriculture (IITA), Ibadan, Oyo, Nigeria
4. United States Department of Agriculture, Agricultural Research Service (USDA-ARS) R.W. Holley Center for Agriculture and Health, Ithaca 14853, NY