Fig. 6From: An eukaryotic elongation factor 2 from Medicago falcata (MfEF2) confers cold toleranceNet photosynthetic rate (A) and chlorophyll a fluorescence index in transgenic tobacco plants overexpressing MfEF2 in comparison with the wild type (WT) after chilling treatment. A (a), Fv/Fm (b), qp (c) and NPQ (d) were determined 3 d after plants were treated at 2 °C. Means of three independent samples and standard errors are presented; the same letter above the column indicates no significant difference at P < 0.05Back to article page