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2026 Vol.35, Issue 3 Preview Page

Original Articles

LED Supplemental Irradiation Enhances Photosynthetic Efficiency and Fruit Yield in Winter Greenhouse Paprika

겨울철 온실 파프리카의 광합성 효율 및 과실 수량 향상을 위한 LED 보광 효과

Seung Mi Woo1
,
Ji Heon Seo2
,
Ho Cheol Kim3*
우 승미1
,
서 지헌2
,
김 호철3*
1PhD Candidate, Department of Horticulture, Graduate School of Wonkwang University, Iksan 54538, Korea
2Master’s Student, Department of Horticulture, Graduate School of Wonkwang University, Iksan 54538, Korea
3Professor, Major in Horticultural industry, Division of Smart Agricultural Science, College of Agriculture and Life Sciences, Wonkwang University, Iksan 54538, Korea
1원광대학교 일반대학원 박사수료
2원광대학교 일반대학원 석사과정
3원광대학교 원예산업학전공
*Corresponding Author
31 July 2026. pp. 303-315
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Abstract

Winter greenhouse paprika production in Korea suffers severe yield losses due to insufficient solar radiation, with productivity during January–February declining over 60% compared to optimal periods. This study evaluated the effects of LED supplemental irradiation (LED SI, 250 µmol·m-2·s-1, red : white = 3:1) on photosynthetic performance and fruit yield in commercial paprika cultivation during low-light winter conditions (November 2021–March 2022). LED SI increased canopy-level PPFD by 21.4%, red light intensity by 44.8%, and R/FR ratio by 110.6%. Stomatal conductance increased by 45.4% (0.262 to 0.381 mol·m-2·s-1) and transpiration rate increased by 32.9% (1.681 to 2.234 mmol·m-2·s-1) under LED SI. Quantum yield of PSII improved from 0.665 to 0.695, and relative electron transport rate increased from 55.1 to 69.9 µmol·m-2·s-1. Importantly, cumulative fruit harvest increased by 7.8% (19.3 vs. 17.9 fruits·plant-1) without compromising fruit quality. LED supplemental irradiation represents a commercially viable technology for mitigating winter light stress and enhancing year-round productivity in temperate greenhouse paprika systems.

Keywords
irradiation
low-light winter
R/FR ratio
Quantum yield of PSII

우리나라의 겨울철 온실 파프리카 재배는 일사량 부족으로 인해 생산성이 크게 감소하며, 특히 1－2월의 생산량은 최적 생육 시기에 비해 60% 이상 감소한다. 본 연구에서는 저광 환경의 겨울철(2021년 11월－2022년 3월) 상업용 온실에서 LED 보광(LED SI, 250μmol·m-2·s-1, 적색:백색 = 3:1)이 파프리카의 광합성 특성 및 과실 생산성에 미치는 영향을 평가하였다. LED 보광은 미처리구 대비 PPFD를 21.4%, 적색광 강도를 44.8%, 적색/원적색(R/FR) 비를 110.6% 증가시켰다. 또한 기공전도도는 0.262에서 0.381mol·m-2·s-1로 45.4%, 증산속도는 1.681에서 2.234mmol·m-2·s-1로 32.9% 증가하였다. 광계 II(PSII)의 양자수율은 0.665에서 0.695로 향상되었으며, 상대 전자전달속도는 55.1에서 69.9μmol·m-2·s-1로 증가하였다. 특히 과실의 누적 수확량은 품질 저하 없이 한 주 당 17.9개에서 19.3개로 7.8% 증가하였다. 이러한 결과는 LED 보광조사가 겨울철 광 부족 스트레스를 완화하고, 온대 지역 온실 파프리카의 연중 생산성을 향상시키는 실용적인 기술임을 시사한다.

키워드
광계 II(PSII) 양자수율
겨울철 저광량
적색/원적색(R/FR) 비
광 조사
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Information
  • Publisher :The Korean Society for Bio-Environment Control
  • Publisher(Ko) :(사)한국생물환경조절학회
  • Journal Title :Journal of Bio-Environment Control
  • Journal Title(Ko) :생물환경조절학회지
  • Volume : 35
  • No :3
  • Pages :303-315
  • Received Date : 2026-07-21
  • Revised Date : 2026-07-29
  • Accepted Date : 2026-07-30
  • DOI :https://doi.org/10.12791/KSBEC.2026.35.3.303
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