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The effect of stratification time on epicotyl dormancy release of Tibetan peony seeds. (A) Epicotyl–plumule germination percentage and germination potential; (B) epicotyl–plumule germination process for seeds with different cold stratification times. Upper and lower case letters represent the effects of stratification time on epicotyl–plumule germination percentage and germination potential of Tibetan peony seeds, respectively, based on one-way ANOVA (P = 0·05). Mean ± s.e.
