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Supplemental brassinolide enhances high-light phototropism and slightly reduces very-low-light phototropism. A and B, High-light (A; 100 μmol m−2 s−1) and very-low-light (B; 0.01 μmol m−2 s−1) phototropic responses of brassionolide (1.0 nm) and mock-treated (ethanol) wild-type (Ler) seedlings. Vertex curvature (mm−1) was used to measure the magnitude of phototropism. Error bars represent se.
