Fig. 4From: An eukaryotic elongation factor 2 from Medicago falcata (MfEF2) confers cold toleranceFreezing tolerance of transgenic tobacco plants overexpressing MfEF2 in comparison with the wild type (WT). Photography was taken before freezing treatment and 7 d of recovery at room temperature after freezing treatment at − 3 °C for 6 h (a), followed by calculating survival rate (b)Back to article page