Design of time series experiments. Plants were grown on soil for 5 weeks in controlled growth chambers under the specified conditions. Black bars indicate a treatment of the plants with brassinolide (BL) or brassinazole (BRZ). Samples were taken at day 0 (21 days after sowing), 1, 3, 6, 9 and 14. LD, long day; SD, short day; CN, cold night.