1. Department of Genetics; Friedrich Schiller University Jena; Philosophenweg 12 07743 Jena Germany
2. Laboratory of Growth Regulators; Centre of the Region Haná for Biotechnological and Agricultural Research; Palacký University & Institute of Experimental Botany; Academy of Sciences of the Czech Republic; Šlechtitelů 27 CZ-78371 Olomouc Czech Republic
3. Plant Cell Biology; Faculty of Biology; University of Marburg; Karl-von-Frisch-Str. 8 35043 Marburg Germany
4. School of Biology; Faculty of Biological Sciences; University of Leeds; Leeds LS2 9JT UK