Figure 3.

Interactions between auxin action and DELLA abundance during low R:FR-induced petiole elongation. A to D, The pRGA∷GFP:RGA reporter shows the abundance of the DELLA protein RGA (green speckles on a background of red-fluorescing chloroplasts). Note that RGA abundance is enhanced upon auxin transport inhibition with the NPA. E, Petiole elongation responses to low R:FR are inhibited by NPA treatment, also in the quadruple DELLA knockout mutant. F, GA addition cannot rescue the lack of shade avoidance in auxin-resistant mutants. Data are means ± se (n = 8–12). Different letters indicate significant differences.