1. Research Centre for Plant Growth and Development, School of Life Sciences; University of KwaZulu-Natal; Pietermaritzburg, Private Bag X01 Scottsville 3209 South Africa
2. Department of Horticultural Sciences, Faculty of Applied Sciences; Cape Peninsula University of Technology; Symphony Way, PO Box 1906 Bellville 7535 Cape Town South Africa
3. Laboratory of Growth Regulators and Department of Chemical Biology and Genetics, Centre of the Region Haná for Biotechnological and Agricultural Research, Faculty of Science; Palacký University and Institute of Experimental Botany, Academy of Sciences of Czech Republic Šlechtitelů 11; 783 71 Olomouc-Holice Czech Republic
4. Department of Environmental Science, Faculty of Agriculture and Environmental Science; Bindura University of Science Education; Private Bag 1020 Bindura Zimbabwe