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Petiole elongation in Arabidopsis in response to shade signals. Petiole length (A and C) and growth rates (B and D) of Arabidopsis (Col-0) plants in low R/FR and green shade as compared with plants grown under white light (spectral composition unaltered). Data are means ± se (n = 10). Asterisks indicate significant differences between light treatments (P < 0.05, Student’s t test).
