LED 전조재배가 딸기의 과실품질과 생산량에 미치는 영향

The effects of supplemental LED lightings on fruit quality and yield of two strawberry (Fragaria × ananassa) cultivars ‘Daewang’ and 'Seolhyang' were determined when blue (441 nm), red (659 nm) and mixed (blue:red = 3:7) LED lights were each supplied daily from 17:00 to 23:00 h, throughout growth period (from Nov. 10 to Mar. 20), with light intensity being adjusted to 75 μmol·m-2·s-1. Incandescent bulbs, which are usually supplemented for winter strawberry cultivation, was used as a control. In both cultivars, blue LED increased yield, and all three types of LEDs enhanced fruit hardness and SSC, while acidity was highest in red LED. Anthocyanin contents in fruit were significantly increased by both blue and mixed LED lightings in 'Daewang', while in 'Seolhyang' only by the blue LED, compared to the incandescent bulb control. Blue and mixed LED lights enhanced glucose contents in‘Daewang’ fruit, while did the mixed LED light in 'Seolhyang’ fruit. As for fruit organic acids, red LED significantly increased malic and oxalic acid contents in 'Daewang' and 'Seolhyang', respectively. In 'Daewang', fruit phenolic compounds contents were significantly higher in red LED or incandescent bulb control than other LED treatments, while in‘Seolhyang’seemed to be highest in the incandescent bulb control. Considering its positive effect on yield and fruit quality, blue LED could be a potential supplemental lighting source for strawberry cultivation winter season.