1. Institute of Plant Biology; Biological Research Centre, Hungarian Academy of Sciences; Temesvári krt. 62 H-6726 Szeged Hungary
2. Institute of Biology2/Botany; University of Freiburg; Schänzlestrasse 1 D-79104 Freiburg Germany
3. Institute of Molecular Plant Science, School of Biological Sciences; University of Edinburgh; Edinburgh EH9 3JH UK