[1] Inst Expt Bot AS CR, Joint Lab, Lab Plant Biotechnol, Prague 16502 6, Czech Republic
[2] Crop Res Inst, Prague 16502 6, Czech Republic
[3] Inst Organ Chem & Biochem AS CR, Dept Radioisotopes, Prague 16610 6, Czech Republic
[4] Inst Expt Bot AS CR, Lab Hormonal Regulat Plants, Prague 16502 6, Czech Republic