1. Research Centre for Plant Growth and Development, School of Life Sciences, University of KwaZulu-Natal Pietermaritzburg, Scottsville 3209, South Africa
2. Laboratory of Growth Regulators, Czech Academy of Sciences, Institute of Experimental Botany, and Palacký University, Faculty of Science, CZ-78371 Olomouc, Czech Republic
3. Department of Chemical Biology and Genetics, Centre of Region Haná for Biotechnological and Agricultural Research, Faculty of Science, Palacký University, Olomouc, Holice CZ-78371, Czech Republic