Fig. 3.

Proline content and the peroxidase (POD) activities in wildtype and INVINH1-scilencing plants under cold stresses. a The proline content of the first mature leaf from INVINH1 RNAi and wildtype plant before and after treated at 4 °C for 24 h. b The POD activity of the first mature leaf from INVINH1 RNAi and wildtype plant before and after treated at 4 °C for 24 h. (POD activity: 1 U = OD·min⁻¹·g⁻¹FW). Each value in (a) is mean ± SE of ten biological replicates. Each value in (b) is mean ± SE of fifteen biological replicates. Lowercase letters indicate values significantly different at P < 0.05