Vernalization of the ox-eye daisy (Chrysanthemum leucanthemum L.)

Abstract

Experiments on vernalization of the ox-eye daisy (Chrysanthemum leucanthemum L.) were carried out from June, 1969 to March, 1970. Rooted young plants, propagated from cuttings of lateral shoots, were exposed to 10°C for 30, 60 or 90 days starting on the first day of each month from July to December as shown in the experimental schedule in Fig. 1.
Although, all showed bolting, except the July-30 day lot, plants could not complete flowering in the lots of July, August and September; except for an occasional flowering. These were devernalization-like phenomena. One such phenomenon showed decay of the flower neck just prior to flowering. However, normal flowering was noted in lots treated from October on. The failure in flowering might be due to younger age of the examined plants and a longer period of the unfavourable condition under artificial lights during the cooling treatment.