1. Biological Research Centre; Institute of Plant Biology; Temesvári krt. 62., H-6726 Szeged Hungary
2. Royal Holloway; University of London; Egham Hill Surrey TW20 0EX UK
3. Institute of Life Sciences; Scuola Superiore Sant'Anna; 56127 Pisa Italy
4. Max-Planck-Institut für Züchtungsforschung; Carl von Linne weg 10., 50829 Cologne Germany