1. Department of Biophysics Centre of the Region Haná for Biotechnological and Agricultural Research Palacký University 783 71 Olomouc Czech Republic
2. Department of Biology University of Padova 35131 Padova Italy
3. Department of Biochemistry Molecular Plant Biology University of Turku 20014 Turku Finland
4. Department of Botany Graduate School of Science Kyoto University 606‐8502 Kyoto Japan
5. CREST Japan Science and Technology Agency Chiyoda‐ku 102‐0076 Tokyo Japan