Figure 3.

The number of ESP and HSP proteins in the root collars of the oilseed rape cultivars ‘Casino’ and ‘Valesca’. 1—autumn growth period; 2—early cold acclimation period; 3—end of the cold acclimation period. Four biological experiments with three replicates in each. Within each cultivar, different lowercase letters indicate significant differences in the mean number of proteins in the same fraction (either HSP or ESP) among the three different growth and cold acclimation periods. Different uppercase letters indicate significant differences in the mean number of proteins in the same fraction between the two rapeseed cultivars. Bars are the means ± SD with different letters and are significantly different at p < 0.05 according to the Duncan test.