Fig. 2. The transcript abundance of N-ACETYLSEROTONIN O-METHYLTRANSFERASE (ClASMT) and melatonin accumulation in response to different rootstocks and cold stress.

The seedlings were treated as described in Fig. 1. Root and leaf samples were harvested at 12 h after the cold exposure. The data are presented as the means of three replicates (±SDs). The means denoted with different letters differ significantly at P < 0.05