Figure 1.

The growth elongation response to low R/FR decreases over time. Col-0 seedlings were grown in a L/D cycle (16/8 h) for 4 d in high R/FR (control) and then maintained in high R/FR or transferred to low R/FR for 1 and 2 d under the same light regimen. The top graph shows hypocotyl lengths (means ± se) of wild-type seedlings grown as described. At least 30 seedlings were analyzed for each condition. The bottom graph shows the strength of the hypocotyl elongation response of wild-type seedlings during days 1 and 2 in low R/FR. High-R/FR controls are also shown. Symbols (squares and circles) and vertical lines depict the standardized effect size values and 95% confidence intervals, respectively (Hedges and Olkin, 1985).