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Ikuo Kataoka and Kenji Beppu

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.