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<p>Mangoes (<i>Mangifera indica</i> L.) are notably susceptible to chilling injury (CI) when stored below 13&#xa0;°C. This temperature threshold is too high for extended storage. Therefore, the influence of postharvest immersion in melatonin (MT) (50, 75, 100 µmol L<sup>− 1</sup>) for 120&#xa0;min on CI in ‘Kensington Pride’ mangoes kept at 5 ± 1&#xa0;°C for 21 or 28 d was investigated. The most effective MT concentration was 75 µmol L<sup>− 1</sup> causing 36.3% reduction in CI incidence compared to control. To facilitate adoptability in commercial practice, the influence of 120&#xa0;min vs. 5- and 3-min immersions in 75 µmol L<sup>− 1</sup> MT was also tested. The highest efficacy in reducing CI was shown by mangoes immersed in 75 µmol L<sup>− 1</sup> MT for 5&#xa0;min with 52.2% and 38.6% lower CI incidence and CI index, respectively, than the control. This improved chilling tolerance in MT-treated mangoes was achieved through reduced hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) radicals, malondialdehyde (MDA) production, relative electrolyte leakage (REL) and lipoxygenase (LOX) activity while higher ascorbic acid (AsA) and glutathione (GSH) levels, and activities of ascorbate peroxidase (APX), glutathione reductase (GR) and monodehydroascorbate reductase (MDHAR). Fruit colour, soluble solids content (SSC), and titratable acidity (TA) were maintained in 75 µmol L<sup>− 1</sup> MT treated fruit. MT was effective in reducing CI in mangoes up to 21 d at 5 ± 1&#xa0;°C. Overall, immersing ‘Kensington Pride’ mangoes in 75 µmol L<sup>− 1</sup> MT for 5&#xa0;min before cold storage (5 ± 1&#xa0;°C) shows high adoption potential to mitigate CI.</p>

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Effect of Melatonin on Alleviating Chilling Injury in Cold-Stored ‘Kensington Pride’ Mangoes: A Comparative Evaluation of Long vs Short Dip Time

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月22日

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  • Mekhala Dinushi Kananke Vithana,
  • Hafiz Muhammad Shoaib Shah,
  • Mahmood Ul Hasan,
  • Zora Singh

摘要

Mangoes (Mangifera indica L.) are notably susceptible to chilling injury (CI) when stored below 13 °C. This temperature threshold is too high for extended storage. Therefore, the influence of postharvest immersion in melatonin (MT) (50, 75, 100 µmol L− 1) for 120 min on CI in ‘Kensington Pride’ mangoes kept at 5 ± 1 °C for 21 or 28 d was investigated. The most effective MT concentration was 75 µmol L− 1 causing 36.3% reduction in CI incidence compared to control. To facilitate adoptability in commercial practice, the influence of 120 min vs. 5- and 3-min immersions in 75 µmol L− 1 MT was also tested. The highest efficacy in reducing CI was shown by mangoes immersed in 75 µmol L− 1 MT for 5 min with 52.2% and 38.6% lower CI incidence and CI index, respectively, than the control. This improved chilling tolerance in MT-treated mangoes was achieved through reduced hydrogen peroxide (H2O2) radicals, malondialdehyde (MDA) production, relative electrolyte leakage (REL) and lipoxygenase (LOX) activity while higher ascorbic acid (AsA) and glutathione (GSH) levels, and activities of ascorbate peroxidase (APX), glutathione reductase (GR) and monodehydroascorbate reductase (MDHAR). Fruit colour, soluble solids content (SSC), and titratable acidity (TA) were maintained in 75 µmol L− 1 MT treated fruit. MT was effective in reducing CI in mangoes up to 21 d at 5 ± 1 °C. Overall, immersing ‘Kensington Pride’ mangoes in 75 µmol L− 1 MT for 5 min before cold storage (5 ± 1 °C) shows high adoption potential to mitigate CI.