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The influence of CO 2  on color and anthocyanin concentration in the arils of `Wonderful' pomegranate ( Punica granatum  L.) was investigated. Pomegranates were placed in jars ventilated continuously with air or air enriched with 10% or 20% CO 2  at 10°C for 6 weeks. Samples were taken initially, and after 1, 2, 4, and 6 weeks and anthocyanin concentration was measured by HPLC. The arils of the pomegranates stored in air were deeper red than those stored in CO 2 -enriched atmospheres. This increase in red color resulted from an increase in anthocyanin concentration. Arils from fruit stored in air+10% CO 2  had a lower anthocyanin concentration than air-stored fruit, and atmospheres enriched with 20% CO 2  suppressed anthocyanin biosynthesis. Anthocyanin concentration was well-correlated to the activity of phenylalanine ammonia lyase (PAL), but not to glucosyltransferase (GT) activity. Moderate CO 2  atmospheres (10%) prolong the storage life and maintain the quality of pomegranates, including an adequate red color of the arils.

hortscience

Changes in Anthocyanin Concentration, Phenylalanine Ammonia Lyase, and Glucosyltransferase in the Arils of Pomegranates Stored in Elevated Carbon Dioxide Atmospheres