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Final germination percentages (mean ± s.d.) of fresh seeds for the four investigated populations at different temperatures for each pre-treatment: 0 = control, W = warm stratification (25 °C for 3 months) and C = cold stratification (5 °C for 3 months). Data are the mean of three replicates. For each seed lot one-way ANOVA, followed by post-hoc Fisher's LSD test, was carried out; bars with the same letters are not different at P < 0·05.
