Peach (Prunus persica Batsch "Yuhualu") fruit are sensitive to chilling injury (CI). Proline, polyamine (PA), and nitric oxide (NO) are important small regulators of various metabolic pathways under chilling stress that mitigate CI. Ethylene is known to promote senescence and CI, while 1-methylcyclopropene (1-MCP) is an antagonist that inhibits the effects of ethylene. However, how 1-MCP and ethylene affect proline, PA, and NO levels under chilling stress remains unclear. To address these questions, 1-MCP (1 µL.L-1) and ethylene (1 µL.L-1) treatments were applied to peach fruit. Fruit were stored at 4 °C for 28 d, then moved to 25 °C for 3 d immediately after cold storage. Peach fruit exhibited CI symptoms after 7 d of cold storage with enhanced electrolyte leakage and malondialdehyde contents. The 1-MCP treatment significantly (P < 0.05) restrained peach CI, and fruit did not exhibit CI symptoms until 14...

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