Fig. 2. PIF7 plays a dominant role in the synergistic response to low R/FR and warm ambient temperature.

a Hypocotyl length of 6-day-old Arabidopsis pif mutant seedlings. The number of seedlings (n) is shown under each box. b Hypocotyl length of 6-day-old Arabidopsis PIF7:PIF7-4xMYC (pif457) seedlings. The number of seedlings (n) is shown under each box. The growth conditions are the same as described in Fig. 1a, PAR = 70 µmol m⁻² s⁻¹. Different letters denote statistical differences (p < 0.05) among samples as assessed by one-way ANOVA and Tukey HSD test. Boxes indicate the first and third quartiles and the whiskers indicate the minimum and maximum values, the black lines within the boxes indicate the median values and gray dots mark the individual measurements.