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Root growth is affected by light quantity and quality. A, Eight-day-old seedlings grown on half-strength Murashige and Skoog medium in darkness and white light (WL; 140 μm m−2 s−1 photosynthetically active radiation). B, Eight-day-old seedling grown in white light (140 μm m−2 s−1) or white light plus FR (WL+FR; R:FR 0.1). The arrowheads point to the root-shoot junctions.
