The contribution of the UV light component on the skin coloration was determined in `Hakuho' peach. Detached fruit partially covered with a UV-proof polyvinylchloride (PVC) film and a polyethylene film were exposed to sunlight for 4 days. Red coloration of the fruit and anthocyanin content in the skin were considerably reduced with the UV-proof PVC film. Irradiation with a UV fluorescent lamp at 3.58 W·m-2 markedly enhanced the red color development, while white fluorescent light at 120 μmol·m-2·s-1 did not affect the coloration. UV irradiation also increased the anthocyanin content in the cultured skin discs with increasing irradiance up to above 7.3 W·m-2. These results suggest that the UV component contributes significantly to the enhancement of the fruit coloration by sunlight exposure.
Ikuo Kataoka and Kenji Beppu
S. Kalantari, G. Samson, J. Makhlouf and J. Arul
The application of ultraviolet light on fruit and vegetables is a promising new method to control storage diseases and to delay the onset of senescence. In this investigation, we studied the effects of hormic dose (1,4 Merg•cm-2) of UV-radiation on the ripening of tomato pericarp discs by measuring different characteristics of ripening and senescence during storage. We observed that UV-treatment induced significant delays of the red color development, chlorophyll degradation, and lycopene production compared to control discs. UV-treatment also retarded the decline of the chlorophyll-a fluorescence ratios Fv: Fm and *F : Fm′, two characteristics related, respectively, to the maximum and operational quantum yield of photosystem II electron transport. Furthermore, the climacteric ethylene peak was delayed in the treated discs. However, UV-treatment did not alter textural changes, and the respiratory climacteric peaks were observed concomitantly for both treated and untreated tomato discs. However, the respiratory rate was consistently higher in treated discs. These results indicate that UV irradiation of tomato pericarp discs delays some processes of ripening associated with chloroplast to chromoplast transition whereas other ripening processes seem unaffected.
Chunxian Chen, Paul Cancalon, Carl Haun and Fred Gmitter Jr.
grapefruit juice Biol. Pharm. Bull. 29 2274 2278 Uesawa, Y. Mohri, K. 2006b UV-irradiated grapefruit juice loses pharmacokinetic interaction with nifedipine in rats Biol. Pharm. Bull. 29 1286 1289 Uesawa, Y. Mohri, K. 2008 Drug interaction potentials among
Junfang Wang, Yuxia Sun, Hengzhen Wang, Xueqiang Guan and Lijun Wang
of UV-irradiated berries was close to zero in ripe fruits. In addition, our previous study throughout the entire period of berry development proved that berries at 55 d after anthesis (DAA) of ‘Beihong’ ( V. vinifera × Vitis amurensis ) were most
David Llewellyn, Youbin Zheng and Mike Dixon
and will serve to help growers and industry support representatives make informed decisions about multilayer production systems. Units Literature cited Al Ani, K.E. Anabtawi, M. 2012 UV-irradiation effect on the photodegradation of plasticized
Brianna L. Ewing and Barbara A. Rasco
.H. Miliotis, M.D. Robl, M.G. Bier, J.W. Arrowood, M.J. Churey, J.J. Jackson, G.J. 2002 Inactivation of Cryptosporidium parvum oocysts in fresh apple cider by UV irradiation Appl. Environ. Microbiol. 68 4168 4172 Jackson, L.S. Beacham-Bowden, T. Keller, S
Samson Zeray Tesfay, Sakhile Mathe, Albert T. Modi and Tafadzwanashe Mabhaudhi
cubensis Phytopathology 82 749 753 Rogozhin, V.V. Kuriliuk, T.T. Filippova, N.P. 2000 Change in the reaction of the antioxidant system of wheat sprouts after UV-irradiation of seeds Biofizika 45 730 736 Scalbert, A. Manach, C. Morand, C. Remesy, C. 2005