1. Faculty of Science, Charles University Department of Experimental Plant Biology, , Viničná 5, 128 44 Prague , Czech Republic
2. Institute of Experimental Botany of the Czech Academy of Sciences , Rozvojová 263, 165 02 Prague 6–Lysolaje , Czech Republic
3. Copenhagen Plant Science Center (CPSC), University of Copenhagen Department of Plant and Environmental Sciences, , Denmark
4. Laboratory of Plant Physiology and Biophysics, Bower Building, University of Glasgow , Glasgow G12 8QQ , UK