Fig. 1
From: Biochemical and molecular changes in peach fruit exposed to cold stress conditions
Cold stress acts on plasmalemma and cell membranes. Prolonged exposure to cold induces the accumulation of reactive oxygen species (ROS), such as O2-(superoxide radical) and H2O2 (hydrogen peroxide), acting as potential signalling molecules. ROS can reduce membrane integrity with destabilization of cellular compartments. The loss of cell compartmentalization can induce ion leakage, and several physiological disorders affecting fruit quality such as browning or loss of firmness. ROS can also induce DNA damage and the accumulation of antioxidant compounds. Redox signalling and antioxidant enzyme (APX, CAT, SOD, POD, GSH, etc.) responses are schematized, as well as membrane destabilization, due to lipid peroxidation