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Germination of wild-type (Columbia, Col) and dog1 mutant seeds plotted against different Pfr/P ratios provided by a light pulse. Seeds were stored at 25 °C for 50 d and then incubated at 7 °C for 0 or 7 d, followed by a pulse of light that established different calculated Pfr/P ratios. The slopes of the regression line for the VLFR are indicated with the letter b. Values are means of 3–6 replicates ± s.e.
