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Todd C. Wehner, Nischit V. Shetty, and L. George Wilson

All available cucumber (Cucumis sativus L.) cultigens were tested for combining ability for fruit storage ability by crossing them with the gynoecious inbred Gy 14. Fruit weight and firmness were measured before and after storage, and fruits were rated for water loss after storage. The cultigens with the lowest percentage of fruit weight loss during storage were PI 172839, PI 344067, PI 264667, PI 171612, PI 339245, PI 220171, PI 279469, and PI 368550; those with the lowest percentage of loss in fruit firmness were PI 379284, PI 339241, PI 414159, PI 422177, `Regal', PI 109483, `Addis', PI 285603, PI 257486, and `Calypso'. The cultigens demonstrating the least fruit shriveling were `Dasher II', `Sprint 440', `Texas Long', PI 390255, PI 432870, `Pacer', PI 419078, PI 390247, PI 321011, and PI 414158. The 10 best cultigens from the initial screening study, along with the four worst cultigens and six checks, were retested directly (not as F1 progeny) for fruit keeping ability in two storage conditions and at two harvest dates. No significant differences were detected between the two harvest dates and storage conditions.

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Muharrem Ergun, Jiwon Jeong, Donald J. Huber, and Daniel J. Cantliffe

`Galia' (Cucumis melo var. reticulatus L. Naud. `Galia') melons exhibit relatively short postharvest longevity, limited in large part by the rapid softening of this high quality melon. The present study was performed to characterize the physiological responses of `Galia' fruit harvested at green (preripe) and yellow (advanced ripening) stages and treated with 1-methylcyclopropene (1-MCP) before storage at 20 °C. Treatment with 1.5 μL·L-1 1-MCP before storage delayed the climacteric peaks of respiration and ethylene production of green fruit by 11 and 6 d, respectively, and also significantly suppressed respiration and ethylene production maxima. Softening of both green and yellow fruit was significantly delayed by 1-MCP. During the first 5 d at 20 °C, the firmness of green control fruit declined 66% while 1-MCP-treated fruit declined 46%. By day 11, firmness of control and 1-MCP-treated green fruit had declined about 90% and 75%, respectively. The firmness of control yellow fruit stored at 20 °C declined 70% within 5 d while 1-MCP-treated fruit declined 30%. The 1-MCP-induced firmness retention was accompanied by significant suppression of electrolyte leakage of mesocarp tissue, providing evidence that membrane dysfunction might contribute to softening of `Galia' melons. The mesocarp of fruit harvested green and treated with 1-MCP eventually ripened to acceptable quality; however, under the treatment conditions (1.5 μL·L-1 1-MCP, 24 h) used in this study, irreversible suppression of surface color development was noted. The disparity in ripening recovery between mesocarp versus epidermal tissue was considerably less evident for fruit harvested and treated with 1-MCP at an advanced stage of development. The commercial use of 1-MCP with `Galia'-type melons should prove of immense benefit in long-term storage and/or export situations, and allow for retention of quality and handling tolerance for fruit harvested at more advanced stages of ripening.

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Hassan A. Al-Kahtani

Eleven pomegranate (Punica granatum L.) cultivars were first evaluated, dried for 9 days at 20C and 47% relative humidity (RH), 30C and 33% RH, and 40C and 25% RH before storage at 20 ± 2C and 47% RH. `Taifi-A' was given the highest scores for sensory evaluation. `Kab El-Jameel' contained significantly more edible portion and more juice, and had lower pH and higher acidity than any other cultivar. The highest vitamin C content was found in `Taifi-A', `Red Balady', and `Mellasi'. Drying at 40C and 25% RH seriously damaged the pomegranates. `De-Jativa, `Molar', `Succary', and `Taifi-R' softened on the 4th day of drying and were more sensitive to drying conditions than the others. Drying at 30C and 33% RH and at 20C and 47% RH did not appear to have visually deleterious effects on the internal portion of the fruit, but the edible portion was slightly inferior to that of fresh (refrigerated) fruits, particularly those dried at 30C and 33% RH. The juices of most dried fruits had higher pH, acidity, and total soluble solids content, but less vitamin C than fresh fruits. Fruits dried at 30C and 33% RH or 20C and 47% RH remained acceptable at 20 ± 2C and 47% RH for up to 3 months or more, depending on the cultivar. Fungal decay (Aspergillus niger. Tiesh. and some Penicillum spp. were found) appeared only in fruits previously dried at 20C and 47% RH. Partial drying of pomegranates maybe useful for processed juice products.

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Richard L. Bell, Tom van der Zwet, Steve Castagnoli, Todd Einhorn, Janet D. Turner, Robert Spotts, Gary A. Moulton, Greg L. Reighard, and William W. Shane

‘Gem’ is a new cultivar that combines excellent appearance, fruit quality, and long storage potential with precocious and high yields. It can be eaten without ripening as a result of a crisp, juicy texture as well as ripened to a soft texture. ‘Gem’ was jointly released by the U.S. Department of Agriculture, Oregon State University, Michigan State University, and Clemson University in 2013.

Origin

The cross from which ‘Gem’ was selected, ‘Sheldon’ × US62563-004 (Fig. 1), was planned and performed by T. van der Zwet and R.C. Blake in 1970 (Fig. 1). The original source of

Open access

Esmaeil Fallahi, Timothy L. Righetti, and D.G. Richardson

Abstract

Forward stepwise multiple regression equations were developed from seasonal leaf and fruit mineral analyses to predict quality parameters for ‘Starkspur Golden Delicious’ apple (Malus domestica Borkh.) during 1980–82. Quality parameters were evaluated both at harvest and after 6 months of 0°C storage. Soluble solids, skin ground color, and titratable acidity were strongly predictable as early as June or July. However, an August analysis was most predictive. For titratable acidity, a combination of both leaf and fruit minerals produced stronger predictions than leaf or fruit minerals alone in each individual year. Soluble solids, skin ground color, and bitterpit were more accurately predicted by fruit analyses. Fruit size was important in regression equations for firmness, but was not essential for other parameters. Although between-year predictions were not as good as within-year predictions, regression equations could successfully place fruit in high or low categories for most quality parameters.

Open access

Konstantinos G. Batziakas, Shehbaz Singh, Kanwal Ayub, Qing Kang, Jeffrey K. Brecht, Cary L. Rivard, and Eleni D. Pliakoni

BreatheWay technology, on the postharvest losses of spinach when stored at nonoptimum temperatures. More specifically, we evaluated the effect of passive MAP when spinach was stored at nonoptimum temperature on its storage life, and its physical, organoleptic

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Charles F. Forney

). These higher recommended RHs are most likely influenced by the positive response of other fruit to high RH. To clarify storage recommendations, a study was conducted to reassess the effects of temperature and RH on cranberry storage life. The

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Xingbin Xie, Todd Einhorn, and Yan Wang

, 1989 ). Compared with other european pear cultivars, Starkrimson pear has a short storage life primarily due to the development of a mealy texture and an IB disorder after ripening and storage, respectively. ‘Starkrimson’ pears have a maximum storage

Open access

Zienab F.R. Ahmed, Navjot Kaur, Sajid Maqsood, and Guillermo Schmeda-Hirschmann

et al., 2015 ). The use of Ca after the fruit has been harvested maintains cell turgor, membrane integrity, and tissue firmness, and delays membrane lipid catabolism, therefore extending storage life of fresh fruits ( Ahmed and Palta 2017 ; Atia et

Full access

P.R. Johnstone, T.K. Hartz, and D.M. May

Fruit firmness and storage life are important melon quality attributes, particularly for the California industry. Melons exported from California to Asian markets must maintain firmness through several weeks of ocean transit. Domestic use of