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. 2021 Sep 29;20(1):183–200. doi: 10.1111/pbi.13705

Figure 2.

Figure 2

Ethylene enhanced trifoliate orange cold tolerance and PtrERF9 expression was increased association with ethylene production under cold stress. (a) Cold induced ethylene production in trifoliate orange. (b) Phenotype of ACC‐, water‐ or AVG‐pretreated wild‐type plants in response to freezing treatment. Scale bars = 1 cm. (c, d) Electrolyte leakage (c) and MDA levels (d) in ACC‐, water‐, AVG‐pretreated wild‐type plants after cold treatment. Error bars indicate ± SE (n = 3). Asterisks indicate significant differences between different groups (**P < 0.01, ***P < 0.001). (e, f) The expression of PtrERF9 under ACC treatment (e), cold and cold with AVG treatment (f) in trifoliate orange. Error bars indicate ± SE (n = 3).