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Hypocotyl elongation responses to treatments that affect auxin levels. A, Hypocotyl growth response to low R:FR light. LD, long days; LD + FR, long days with supplemental far-red light. n = 15 to 16. B, Hypocotyl growth after 4 short days at 22°C or 28°C. n = 17 to 29. Data are means ± sd, and lowercase letters indicate statistically distinguishable values as assessed by Tukey’s honestly significant difference test.
