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Figure S1. SAS responses to B light attenuation are conserved in quintuple yucca mutants. Plants were grown under white light (WL) or WL filtered through a yellow filter (-BLUE). Morphological measurements and photographs were taken after 7 days of treatment. Thin bars indicate ±1 SE (n = 10–12 individual plants). Asterisks indicate significant effects of the light treatments at the indicated P value. (a–c) Comparison of morphological responses between Col-0 and quintuple yucca mutants. (d) Representative photographs of the plants after exposure to the indicated light treatments.

Figure S2. Effect of NPA on leaf angle, petiole length and L:P ratio of WT Columbia-0 plants in response to low blue treatment. NPA was sprayed onto intact 14-d rosette plants immediately before the beginning of the light treatments. After the NPA treatment, the plants were grown under white light (WL, white bars) or WL filtered through a yellow filter (-BLUE, black bars). Morphological measurements and photographs were taken after 4 days of treatment. Thin bars indicate ±1SE (n = 10–12 individual plants). Asterisks indicate significant effects of the light treatments at the indicated P value. Different letters indicate significant differences between means in cases in which the light x genotype interaction term (L × G) was significant. (a–c) NPA effect at high (50 μM) doses. This NPA treatment caused considerably growth inhibition and leaf curling, bud did not prevent the hyponastic response. (d–f) NPA effect at low doses (≤5 μM). Notice that these low NPA doses had per se a positive effect promoting a hyponastic response.

Figure S3. GA treatment triggered rapid mCITRINE-RGA turnover in the pUBQ10::mCITRINE-RGA line.

Figure S4. Representative photographs of the phenotype of the det2-1 mutant under the attenuated blue light conditions used in this study. Photographs were taken after 7 days of treatment.

Figure S5. Irradiances and spectral photon distributions under the light treatments used in the canopy and filtration experiments, respectively. (a) Mean and Standard Error values for the PAR and B irradiances (μmoles.m−2.s−1) and the R:FR ratio characteristic of light environments in the glasshouse canopy experiments shown in Figure 2. (b) Spectral photon distributions under the light treatments used in the growth chamber filtration experiments.

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