1. School of Live Sciences, University of Warwick, Coventry, UK
2. Laboratory of Growth Regulators, The Czech Academy of Sciences, Institute of Experimental Botany & Palacky University, Slechtitelu, Olomouc, Czech Republic
3. University Hradec Kralove, Faculty of Science, Department of Biology, Rokitanskeho, CZ-50003 Hradec Kralove, Czech Republic