LD conditions were 16 h of light and SD condi- tions were 8 h of light in all experiments. Unver- nalized plants were grown at 18–25 C at Photosynthetically Active Radiations (PAR) of 200–270 lE m)2 s)1. Vernalization experiments were performed for 6 weeks at 4 C under both SD and LD (PAR 150–190 lE m)2 s)1).