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`Wonderful' Pomegranates ( Punica granatum  L.) were placed in jars ventilated continuously with air or air enriched with 10 or 20 kPa CO 2  at 10 °C for 6 weeks. Samples were taken initially and after 1, 2, 4, and 6 weeks, and postharvest quality attributes were measured. The arils of the pomegranates stored in air were deeper red than the initial controls and than those stored in CO 2 -enriched atmospheres. This increased color was associated with increased anthocyanin concentration. Arils from fruit stored in air enriched with 10 kPa CO 2  had a lower anthocyanin concentration than air-stored fruit, and atmospheres enriched with 20 kPa CO 2  had even lower levels, possibly from suppressed anthocyanin biosynthesis. Anthocyanin concentration correlated well with the activity of phenylalanine ammonia lyase but not with glucosyltransferase activity. Moderate CO 2  atmospheres (10 kPa) prolong the storage life and maintain quality of pomegranates, including adequate red color intensity of the arils.

Effect of Carbon Dioxide on Anthocyanins, Phenylalanine Ammonia Lyase and Glucosyltransferase in the Arils of Stored Pomegranates