expression and flowering time. (a) Comparison of plants grown under long day conditions (LD). (b) Relative expression levels of FLC transcript compared to WT control. Seedlings were collected in the middle of the light photoperiod. (c) Comparison of flowering time represented by an average number of true rosette leaves at the stage where the flower stem is 1 cm long. (d) Representative rosettes of plants grown under short day conditions (SD) at the stage when the leaves were counted. The bar length is 5 cm. In all graphs, asterisks indicate statistical significance of the difference between each mutant and the WT control. A single asterisk indicates a p-value < 0.05, double asterisk – p-value < 0.01 (t-test).