Exploring priming responses involved in peach fruit acclimation to cold stress

Area of Science:

• Plant Physiology
• Molecular Biology
• Agricultural Science

Background:

• Cold storage of fruit can lead to chilling injury (CI), a physiological disorder with an unclear molecular basis.
• Understanding CI development is crucial for improving fruit quality and reducing post-harvest losses.

Purpose of the Study:

• To investigate the molecular mechanisms underlying chilling injury (CI) suppression in peaches.
• To characterize the physiological, proteomic, metabolomic, and transcriptomic responses to cold stress and pre-conditioning.

Main Methods:

• Peaches at different ripening stages were subjected to cold treatment (0°C) with or without pre-conditioning (20°C).
• Proteomic, metabolomic, and targeted gene expression analyses were performed.
• Ripening behavior and physiological changes were assessed post-cold treatment.

Main Results:

• Pre-conditioning (PC) suppressed CI symptoms and enhanced ethylene biosynthesis compared to other treatments.
• Significant differences in protein and metabolic profiles were observed across treatments and time points.
• Metabolomic and gene expression data suggested a role for valine and/or isoleucine in CI tolerance.

Conclusions:

• Pre-conditioning is an effective strategy to mitigate CI in peaches.
• The study provides novel molecular insights into fruit acclimation to cold environments.
• Valine and/or isoleucine metabolism may be key targets for enhancing fruit cold tolerance.