Exogenous Spermidine Alleviated Low-Temperature Damage by Affecting Polyamine Metabolism and Antioxidant Levels in Apples.

In addition, although the ODC activity of exogenous spraying Spd and water showed an increasing trend at −10 °C, −15 °C, and −20 °C, there was no significant difference in ODC activity under the same low-temperature stress ( Figure 4 E).

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