Molecular analysis of the improvement in rachis quality by high CO2 levels in table grapes stored at low temperature

► 3-Day high CO2 pretreatment improved rachis quality in table grapes stored at 0 °C. ► Rachis browning appearance was linked to an induction of VcPAL and GPO1 gene expression. ► High CO2 levels reduced the MDA content in rachis and activated the enzymatic antioxidant system. ► ACO and ACS gene expression was induced by low temperature in rachis and arrested by high CO2 levels.