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Relative rank of frost tolerance in three freezing stress experiments at −14 °C. The colour of the boxes indicates membership to the red and blue clusters according to De Flaviis et al. [5], with Solina 21 belonging to the blue cluster closest to the red cluster shown in purple. Relative ranks did not differ significantly for accessions with the same letter according to Kruskal-Wallis test and multiple comparison with Bonferroni correction.
