Fig. 3.

The impact of vernalization time on the freezing tolerance of timothy and canopy structure was determined in terms of (A) the number of developing lateral tillers and (B) the percentage of flowering plants after freezing. The plants were vernalized at 6 °C/4 °C (day/night) for 0, 2, 10, 18 or 20 weeks and exposed to controlled freezing conditions. Data show the means ± s.e. of 9–12 plants.