Figure 1.

Changes in (a) ET production, (b) ACC content, and (c) ACO activity in V. amurensis and ‘Muscat Hamburg’ under cold stress. Determination was performed at 0, 2, 4, 8, 24, and 48 h under cold stress at 4 °C. For AVG treatment, the plantlets were treated with 100 μM AVG under cold stress, and distilled water was used as control. Data are the mean values ± SE of three biological replicates. **and *indicate significant differences compared with the point of 0 h at P < 0.01 and P < 0.05 (Student’s t-test), respectively.