All lateral shoots were removed, leaving only the main shoot. Plants were moved to growth chambers maintained at 18, 21, 24, 27, and 30◦C during the day [0800–1600 h;35 W/m2 (400–700 nm) from incandescent and fluorescent light sources] and at 16◦C during the night. After 42 d of temperature treatments, all were grown in the greenhouse described in Expt. 1.Data collected from 20 plants were number of days to flower from the start of temperature treatments and flower number. Data were subjected to regression analysis.