1. International Institute of Tropical Agriculture (Iita), Maize improvement Unit, Ibadan, Nigeria
2. Department of Agronomy, Pan African University Life and Earth Sciences Institute, University of Ibadan, Ibadan, Nigeria
3. Department of Plant Science, College of Agricultural Sciences, Arba Minch University, Arba Minch, Ethiopia
4. Department of Agronomy, University of Ibadan, Ibadan, Nigeria