Search Results

You are looking at 1 - 10 of 733 items for :

  • All content x
Clear All
Free access

Guy D'hallewin, Mario Schirra, Enzo Manueddu, Antonio Piga, and Shimshon Ben-Yehoshua

`Washington Navel', `Biondo Comune', `Tarocco', and `Valencia Late' orange [Citrus sinensis (L.) Obsek] fruit, harvested at various periods of time, were subjected to ultraviolet-C (UV-C) irradiation at 0.5, 1.5, or 3.0 kJ·m-2 doses and then stored at 7 °C and 90% to 95% relative humidity (RH) for 4 weeks plus one additional week at 20 °C and 80% RH. Following UV-C treatment, there was varying amounts of rind browning and necrotic peel damage, depending on cultivar, treatment dose, and harvest date. `Tarocco' fruit were damaged more easily by UV-C treatment than the other cultivars. `Valencia L.' were the most resistant to UV-C irradiation, showing no adverse effects at the lowest dosage and having the lowest percentages of damaged fruit at higher dosages. `Washington Navel' and `Biondo Comune' oranges showed an intermediate susceptibility to UV-C treatment, with negligible differences between these cultivars. The percentage of damaged fruit after irradiation at the higher UV-C dosages decreased in most fruit samples as the season progressed. UV-C irradiation at 0.5 kJ·m-2 effectively reduced decay development compared with nontreated fruit. Irradiation with 1.5 kJ·m-2 was more effective compared with 0.5 kJ·m-2 only in early harvested fruit. In `Washington Navel' and `Biondo Comune' oranges in the later harvests, treatment with 3.0 kJ·m-2 improved decay control further, compared with 0.5 kJ·m-2. Following UV-C treatments the phytoalexins, scoparone and scopoletin, accumulated in flavedo tissue depending on the cultivar, fruit age, and UV-C treatment. Both phytoalexins displayed a similar accumulation pattern, however, the levels of scopoletin were very low compared with scoparone. Concentrations of phytoalexins rose as the irradiation dose increased. No scoparone and scopoletin could be detected in nontreated fruit. The highest concentration of phytoalexins among cultivars was recorded in `Valencia Late' oranges, the lowest in `Tarocco', with similar intermediate accumulations in `Washington Navel' and `Biondo Comune'. In `Washington Navel', `Biondo Comune', and `Tarocco' oranges, the rate of scoparone accumulation was significantly higher in fruit harvested earlier in the season while `Valencia late' oranges exhibited an opposite trend.

Free access

Kwang Jin Kim, Eun Ha Yoo, and Stanley J. Kays

increase in toluene removal efficiency was assessed over a 7-d period, the timing of the decline was more precisely illustrated ( Fig. 3 ). The decay in the stimulation response varied depending on the plant species tested. B. maculata declined

Free access

Manuela Baietto and A. Dan Wilson

). Thus, tree mortality resulting from diseases, wood decay, and insects causes significant economic losses in many different ways. Despite the importance and valuable roles that landscape trees play in the enhancement of our quality of life, urban trees

Free access

J.A. Narciso, E.A. Baldwin, A. Plotto, and C.M. Ference

containers that are delivered to the supermarket. Any treatment to reduce decay of strawberries would best be done as a preharvest operation to fit the current industrial harvesting and handling practices. Postharvest decay treatments to strawberries would

Full access

David Obenland, Dennis Margosan, Joseph L. Smilanick, and Bruce Mackey

advantage of the fact that incipient decay lesions caused by the green mold or blue mold pathogens ( Penicillium digitatum or Penicillium italicum , respectively), and other severely damaged areas on the fruit display a bright yellow fluorescence in the

Free access

Peter L. Sholberg and Paul Randall

of apple slices. Hexanal has also been used to control postharvest decay in stone fruit incited by Monilinia laxa and Rhizopus stolonifer ( Caccioni et al., 1995 ). Hexanal has other properties in addition to its antimicrobial activity. Aroma

Free access

Ryan J. Hayes, Carlos H. Galeano, Yaguang Luo, Rudie Antonise, and Ivan Simko

change as a result of respiration and package film gas permeation or achieved actively (active MA) by flushing the package with N 2 before sealing the bags closed ( Kim et al., 2005 ). Lettuce has genetic variation for decay or shelf life (tissue

Full access

Ammon Lichter, Yohanan Zutahy, Tatiána Kaplunov, and Susan Lurie

Table grapes are a nonclimacteric fruit with a low rate of physiological activity ( Peynaud and Ribereau-Gayon, 1971 ) but are subject to serious water loss and decay during postharvest handling ( Nelson, 1985 ). Gray mold caused by the fungus

Full access

Robert K. Showalter

Serious, postharvest decay losses occurred in tomatoes when water in which they were submerged was cooler than the fruit. Tomatoes have extensive intercellular air spaces, a heavily cutinized epidermis, and no stomatal openings. When tomatoes with unbroken skins were submerged in packinghouse dump tank water of lower temperatures, the internal air contracted and water plus decay organisms were drawn into the fruits through the stem scar. Heating dump tank water has been successful in limiting this decay problem.

Free access

Jun Tang, Kang-Di Hu, Lan-Ying Hu, Yan-Hong Li, Yong-Sheng Liu, and Hua Zhang

S has been found in fresh-cut flowers, strawberry, and kiwifruit ( Gao et al., 2013 ; Hu et al., 2012 ; Zhang et al., 2011 ). However, whether H 2 S can alleviate the senescence and decay in fresh-cut sweetpotato roots and the mechanisms underlying