Figure 7.

Functional Analysis of KDR, THE1, FER, and LLG1 in Low R:FR-Exposed Arabidopsis Rosettes and Seedlings Reveals Functions in Regulating Elongation of Petioles and Hypocotyls.

(A) and (B) Petiole elongation (mm) of several KDR, THE1, FER, and LLG1 deficient and overexpressing lines compared with the wild-type control (Col-0), grown in control white light (R:FR = 1.8, light gray bars) or low R:FR (R:FR = 0.2, dark gray bars) conditions for 24 h (data represent means + se, n = 10. Different letters indicate significant differences; P < 0.05, two-way ANOVA with post-hoc Tukey test) (A), with representative photographs of leaves grown in control (left pairs) or low R:FR (right pairs) for 5 d (B).

(C) Hypocotyl length (mm) of Arabidopsis lines shown in (A) after 4 d of control white light or low R:FR treatment. Data represent means + se, n = 40. Different letters indicate significant differences (P < 0.05, two-way ANOVA with post-hoc Tukey test).