1. Institute for Plant Biotechnology, Department of Genetics, Stellenbosch University, Stellenbosch, South Africa
2. Department of Biotechnology and Consumer Sciences, Cape Peninsula University of Technology, Cape Town, South Africa
3. School of Life Sciences, University of KwaZulu-Natal Westville Campus, Durban, South Africa
4. Forests – Research, Planning and Nurseries Department, Sappi Shaw Research Centre, Howick, South Africa