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Freezing tolerance of (A) leaves and (B) whole plants expressed as LT50 values. Plants were pretreated by standard (S), cold (C) or combined cold and low light (CL) conditions for one week. Means ± SD are shown in plots. Between-treatment and between-genotype differences were evaluated by one-way ANOVA with Tukey’s test (p < 0.05, n = 6).
