Figure 1.

Expression of CBF pathway cold-regulated genes in response to ABA under cold stress. Leaves of rubber tree seedlings were sprayed with water or 50 µM ABA at 10 °C for a designed time. HbeIF2 was used as internal control. Expression of: (A) HbICE2; (B) HbCBF1; (C) HbCBF2; (D) HbCBF3in rubber tree seedlings treated with cold or cold+ABA. Data are presented as mean ± SD of one experiment representative of three independent experiments. Asterisks indicate significant differences between ABA-treated seedlings and control seedlings under cold stress (*, p < 0.05; **, p < 0.01; ***, p < 0.001).