[1] Univ Bonn, Inst Bot, Dept Plant Cell Biol, D-53115 Bonn, Germany
[2] Slovak Acad Sci, Inst Plant Genet & Biotechnol, SK-94901 Nitra, Slovakia
[3] Adam Mickiewicz Univ, Inst Mol Biol & Biotechnol, PL-61701 Poznan, Poland
[4] Polish Acad Sci, Inst Bioorgan Chem, PL-61704 Poznan, Poland