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Correlations between the proline content of Arabidopsis and Thellungiella leaves and their freezing tolerance after cold acclimation. The lines were fitted to the data by linear regression analysis and the correlation coefficients and p-values are shown in the panels. The data for Thellungiella (solid symbols) are the same as those shown in Fig. 1 for LT50 and in Fig. 4 for proline content. The data for Arabidopsis (open symbols) are taken from [13].
