Characterization of the Effects of Different Wavelengths of Night-break Lighting on the Fruit Quality and Yield of 'Kyoho' Grapes
2017
Kim, J.H., Chung-Ang University, Anseong, Republic of Korea | Park, Y.S., Chung-Ang University, Anseong, Republic of Korea | Kwon, Y.H., National Institute of Horticultural and Herbal Science, Wanju, Republic of Korea | Jung, M.H., Chung-Ang University, Anseong, Republic of Korea | Park, H.S., Chung-Ang University, Anseong, Republic of Korea
This study was conducted to estimate the light pollution damage caused by night-break lighting in 'Kyoho' grapes. Night irradiation was performed every night for four hours (10 p.m. to 2 a.m.) from the full bloom to the harvest stage using red, blue, and white lamps as artificial light. Fruit yield, soluble solid content, anthocyanin content, and chlorophyll a content were affected by night irradiation. The soluble solid content of the control was 17.5 °Brix, approximately 1°Brix higher than the red (16.4°Brix), blue (16.2°Brix), and white light treated grapes (16.3°Brix). The anthocyanin content of the skin was also higher in the control at 4.08 μgㆍcm-2 compared to the red (3.14 μgㆍcm-2), blue (2.47 μgㆍcm-2), and white (2.82 μgㆍcm-2) light treated samples. On the other hand, the chlorophyll a content of the control was the lowest at 0.268 μg·cm-2 as compared with the red (0.339 μgㆍcm-2), blue (0.345 μgㆍcm-2), and white (0.372 μgㆍcm-2) light treated samples. Considering that higher soluble solid contents, higher accumulation of anthocyanin, and lower chlorophyll a contents are factors involved in fruit maturation, night irradiation may delay fruit maturation and red light treatment may result in decreased yield. Our results confirmed that night-break lighting regardless of the wavelength provoked light pollution in 'Kyoho' grapes. Therefore, fruit maturation may be poor in the presence of artificial light, including streetlamps, in neighboring vineyards.
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