Fig. 6. Vascular development in leaves of temperature shifted and control plants. (A) Counts of completed leaf areoles (a region fully delimited by veins) in the first leaves of 14-day temperature-shifted plants. Bars indicate the standard error of the mean, 18-26 leaves were examined for each time-point. (B) Depiction of the developmental progression of primary and secondary veins in leaves of Ler plants from a developmental time course carried out at 16°C or 29°C. For each time-point, the height of the white, stippled or black area represent the fraction of leaves with 1° or 2° veins totally absent (white), present only as procambium (stippled), or at least some of that vein class differentiated (black).