Fig. 4.

PRR9 is necessary for root thermomorphogenesis. a) Root length of WT (Col-0) and the different elf3, prr9, and prr7 mutants under SD photoperiods. Seedlings were grown with an ambient temperature of 20°C (gray), 28°C warm nights (orange), or constant 28°C (red) temperatures. b) Average percentage change under warm nights or constant 28°C for the different genotypes. Error bars represent standard deviation. Experiments were repeated twice, with the presented data a combination of the 2 experiments. A minimum of 40 seedlings were analyzed. Letters signify a significant difference of P < 0.05, determined by ANOVA with a Tukey HSD post hoc test.