Reducing chilling injury in 'Palmer' mangoes submitted to quarantine cold treatment

BACKGROUND Treatment with low temperatures can be used to quarantine mangoes against fruit-fly infestation. However, mangoes can develop chilling injury (CI) when stored at temperatures below 13 degrees C. We demonstrated that the immersion in polyol solutions can alleviate CI symptoms in 'Palmer' mangoes stored at 8 degrees C. These suggest that polyols can be used to reduce CI in mangoes during quarantine at low temperatures. Thus, we investigated the efficacy of applying 0.1% (v/v) glycerol, propylene glycol, or sorbitol to 'Palmer' mangoes subjected to cold treatment (1.0 degrees C) for 28 days. Mangoes were then ripened at 23 degrees C for 7 days. RESULTS Among these polyols, sorbitol was the most effective in alleviating CI for up to 14 days of cold treatment. Mangoes treated with sorbitol showed lower levels of malondialdehyde (MDA) and hydrogen peroxide (H2O2), and reduced polyphenol oxidase (PPO) activity. These fruit also had elevated levels of ascorbate (AsA), especially in the epicarp, and increased superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX) activity. CONCLUSION Sorbitol can reduce the CI, but to an unsatisfying level, and it should be combined with other treatments storage at low temperature. (c) 2022 Society of Chemical Industry.

Automated summary

Sorbitol can effectively alleviate chilling injury symptoms in mangoes during cold treatment for up to 14 days by reducing levels of malondialdehyde and hydrogen peroxide, decreasing polyphenol oxidase activity, and increasing levels of ascorbate and antioxidant enzyme activity. However, sorbitol alone may not be satisfactory and should be combined with other treatments to improve storage at low temperatures.