Fig. 1.

Changes in freezing tolerance of winter barley genotypes during cold acclimation (2 °C, photoperiod 10/14 h, PAR = 250 µmol m⁻² s⁻¹). T_EL50 means the temperature at which 50 % of total electrolytes were released from leaf tissues. Values of T_EL50 and coefficient intervals for P = 0·05 were calculated on the basis of freezing tests made in two separate experiments at five freezing temperatures: −3, −6, −9, −12 and −15 °C; in total 20 replicates for each freezing temperature.