1. Discipline of Crop Science, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Pietermaritzburg, South Africa
2. Food Security and Safety Niche Area, Department of Crop Science, Faculty of Natural and Agricultural Sciences, School of Agricultural Sciences, North-West University, Mmabatho, South Africa
3. Discipline of Horticultural Science, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Pietermaritzburg, South Africa
4. Seed Co. International Ltd., Potchefstroom, South Africa