Effect of controlled atmosphere on metabolites associated with quality of 'Sable Seedless' grapes

摘要

Controlled atmosphere (CA) has not been implemented so far for storage of grapes, partly because the threshold for prevention of decay can overlap the accumulation of off-flavors. 'Sable Seedless' was stored under ambient atmosphere or under CA conditions of 5 kPa 02 and 5,10 and 15 kPa of C02. The level of decay in the experiment was low, in part because the fruit were sanitized with ethanol before storage. Off-flavors developed in grapes stored at the high COz level and the berries were sampled forvolatile and non-volatile metabolites. Volatile compounds associated with off-flavor were mainly pyruvate degradation products which accumulated in the high COz atmosphere. Analysis of phenylpropanoid metabolites suggested that flavonols and anthocyanins were lower in fruit stored in the high C02 CA conditions. Of the stilbenes, trans-resveratrol and piceatannol were higher in the control compared to the high C02 CA conditions. These results point on potential markers for negative effects of CA in table grapes and that extreme CA conditions can modulate the phenylpropanoid pathway.