Figure S1. Cool temperature shade avoidance phenotypes in 16-h light/8-h dark cycles.

Figure S2. Early flowering occurs in low red:far-red at both temperatures.

Figure S3. ERECTA expression is localised to elongating tissues and cotyledons in seedlings.

Figure S4. Temperature-dependent shade avoidance in Ler::ER and ERECTA-deficient accessions (Van-0 and Hir) with complemented lines (Van-0::ER and Hir-1::ER).

Figure S5. Hypocotyl lengths of wild type and erecta mutants grown in high and low red:far-red at 16°C and 22°C.

Figure S6. ERECTA regulates leaf hyponasty at 16°C and 22°C.

Figure S7. Transcript abundance of shade avoidance marker genes at 16°C and 22°C.

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Table S1. Metabolite analysis of plants grown in high and low red:far-red at 16°C and 22°C.

Table S2. Primer sequences used for fine mapping long petiole quantitative trait locus.

Table S3. Polymorphisms in the Cvi ERECTA promoter sequence when compared with Ler.


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