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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) fi lm and a polyethylene fi lm 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 fi lm. Irradiation with a UV fl uorescent lamp at 3.58 W·m -2 markedly enhanced the red color de- velopment, while white fl uorescent 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 signifi cantly to the enhancement of the fruit coloration by sunlight exposure. In peach, the development of red skin coloration of fruit markedly depends on the light conditions (Bible and Singha, 1993; Cor- relli-Grappadelli and Coston, 1991; Marini, 1985). Erez and Flore (1986) showed that the exposure to full sunlight for 3 d stimulated considerably color development at the end of stage II of fruit development in 'Redhaven' peach. They also reported that red color was reduced with increasing shading. The fruit inside or at lower position in the canopy usually showed poorer coloration than those outside or at higher position due to reduced light exposure. Techniques such as summer pruning (Myers, 1993), and the use of metalized refl ective fi lm mulches (Layne et al., 2001) have been used to increase light penetration into the tree and consequently improve fruit coloration. The evaluation of the light conditions for fruit coloration of peach, to date, has been based on solar radiation, but the effect of specifi c wave- length of light has not been elucidated. For other fruit, producing anthocyanin pigments in the skin such as apple (Arakawa, 1988; Arakawa et al., 1985; Chalmers and Faragher, 1977), sweet cherry (Arakawa, 1993), and grapes (Kataoka et al., 2003), the role of UV light in the fruit col- oration has been demonstrated. We previously showed that the fruit coloration of 'Satonishiki' sweet cherry was enhanced mainly by irradiation of UV light compared with white light (Kataoka et al., 1996). The present study was conducted to determine the contribution of the UV light component on the skin coloration of detached fruit of 'Hakuho', a common midseason peach cultivar in Japan.

UV Irradiance Increases Development of Red Skin Color and Anthocyanins in `Hakuho' Peach