Abstract
Chilling injury (CI) drastically limits the storage and marketing of limes and grapefruit. Previous studies showed that CI of grapefruit can be largely controlled for ca. 3 weeks by high (up to 10%) CO2 and very high (>95%) relative humidity. Atmospheres established within 7 packaging films differentially permeable to CO2 and O2 were tested for control of CI. Polyvinylchloride and cast vinyl films were tested in detail. Grapefruit CI could be prevented for 1 month at 4.5°C (40°F) by sealing within these films. Even though the films were broken upon removal of the fruit, subsequent shelf life was considerably extended. The fungicide thiabendazole (TBZ) significantly reduced the visible lesions of CI, thus confirming a recent Israeli report.
Abstract
Freeze-damaged ‘Marsh’ grapefruit (Citrus paradisi Macf.) and ‘Pineapple’ orange [Citrus sinensis (L.) Osbeck] fruit were sealed in polyethylene shrink film and stored for 6 weeks at 15°C in an attempt to prevent segment dehydration. Although the film greatly restricted water loss from the fruit, segment dehydration was similar to that observed for waxed fruit. During dehydration of freeze-damaged segments of ‘Valencia’ orange fruit, the relative water content of the adjacent mesocarp tissue increased. However, no differences were found in the soluble carbohydrate levels in mesocarp tissue adjacent to damaged and undamaged segments. The results indicate that the mesocarp tissue is not only in the pathway of water loss from free-damaged citrus fruit, but also accumulates water from damaged tissues. Furthermore, segment tissue membranes and walls appear to be differentially permeable to sugars and water.
degraded by yeasts, lactic, and acetic acid bacteria resulting in lactic and acetic acid formation as a result of exothermic reactions. The acids permeate though the differentially permeable seedcoat into the seed tissue and, together with the heat evolved
and other species within the Cucurbitaceae have a semipermeable envelope surrounding the embryo. This study focused on the anatomy of the micropylar and chalazal regions of the envelope of cucumber seeds as a result of their differential permeability