Molecular Biology Laboratory, Department of Biotechnology, Agricultural University of Athens, Iera Odos 75, Athens, 118 55, Greece. Department of Chemical Biology, Faculty of Science, Palacký University, Šlechtitelů 27, Olomouc, CZ-78371, Czech Republic. Laboratory of Growth Regulators, Institute of Experimental Botany of the Czech Academy of Sciences & Faculty of Science, Palacký University, Šlechtitelů 27, Olomouc, CZ-78371, Czech Republic.