1. Institute of Biology/Applied Genetics, Dahlem Centre of Plant Sciences, Freie Universität Berlin, D-14195 Berlin, Germany
2. Department of Molecular Biology, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký University, 78371 Olomouc, Czech Republic
3. Department of Biochemistry, University of Wisconsin, Madison, Wisconsin 53706
4. Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký University and Institute of Experimental Botany ASCR, 78371 Olomouc, Czech Republic
5. Institute of Plant Sciences, University of Graz, 8010 Graz, Austria