Abstract
Proteome patterns from peach fruit subjected to chilling stress (5°C) and non-chilling stress (10°C) temperatures were compared by 2-dimensional gel electrophoresis (2-DE) and MALDI-TOF/TOF mass spectrometry. Among the 60 differentially expressed proteins detected by 2-DE, those involved in stress response and defense were the most abundant. Proteins associated with membrane stability, as well as sucrose content were reduced in fruit stored at 5°C, possibly contributing to the development of chilling injury (CI) seen at 5°C. In addition, small heat shock proteins and components of the antioxidant defense system were expressed at higher levels under chilling stress. In contrast, storage at non-chilling temperature (10°C) promoted the softening of peach fruit accompanied by increased levels of expansin and pectate lyase. The expression of pathogenesis-related proteins also increased at 10°C, in parallel with the relatively higher incidence of decay observed at this temperature.
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