Journal of Bio-Environment Control (생물환경조절학회지)

The Korean Society for Bio-Environment Control (한국생물환경조절학회)
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The Effect of Greenhouse Climate Change by Temporary Shading at Summer on Photo Respiration, Leaf Temperature and Growth of Cucumber

여름철 수시차광에 의한 온실 환경변화가 오이의 광호흡, 엽온, Thermal breakdown 등 생육에 미치는 영향

  • Kim, Dong Eok (Department of General Education, Korea National College of Agriculture and Fisheries) ;
  • Kwon, Jin Kyung (Energy and environmental engineering division, National institute of Agricultural Science, RDA) ;
  • Hong, Soon Jung (Department of General Education, Korea National College of Agriculture and Fisheries) ;
  • Lee, Jong Won (Department of Horticulture Environment System, Korea National College of Agriculture and Fisheries) ;
  • Woo, Young Hoe (Department of Horticulture Environment System, Korea National College of Agriculture and Fisheries)
  • 김동억 (국립한국농수산대학 교양공통과) ;
  • 권진경 (국립농업과학원 에너지환경공학과) ;
  • 홍순중 (국립한국농수산대학 교양공통과) ;
  • 이종원 (국립한국농수산대학 원예환경시스템학과) ;
  • 우영회 (국립한국농수산대학 원예환경시스템학과)
  • Received : 2020.03.05
  • Accepted : 2020.07.20
  • Published : 2020.07.30
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Abstract

This study was conducted to investigate cucumber plants response to greenhouse environments by solar shading in greenhouse in the summer. In order to estimate heat stress reduction of cucumber plants by solar shading in greenhouse, we measured and analyzed physiological conditions of cucumber plants, such as leaf temperature, leaf-air temperature, rubisco maximum carboxylation rate, maximum electron transport rate, thermal breakdown, light leaf respiration, etc. Shading levels were 90% mobile shading of full sunlight, 40% mobile shading of full sunlight and no shading(full sunlight). The 90% shading screen was operated when the external solar radiation is greater than 650 W·m-2. Air temperature, solar radiation, leaf temperature, leaf-air temperature and light leaf respiration in the 90% shading of full sunlight was lower than those of 40% shading and no shading. Rubisco maximum carboxylation rate, arrhenius function value and light leaf respiration of the 90% shading were significantly lower than those of 40% shading and no shading. The thermal breakdown, high temperature inhibition, of 90% shading was significantly higher than that of 40% shading and no shading. Therefore, these results suggest that 90% mobile shading made a less stressful growth environment for cucumber crops.

본 연구에서는 여름철 고온기 시설재배시 수시차광이 내부환경과 오이 생리적 반응에 미치는 영향을 검토하였다. 온실차광이 오이의 고온 스트레스 완화 정도를 추정하기 위하여 잎 온도, 엽기온차, 최대 카르복실화속도, 최대 전자전달 속도, 열파괴, 광호흡과 같은 오이의 생리적 반응을 측정 분석하였다. 오이 시설하우스의 차광율은 90% 수시차광, 40% 수시차광, 무차광 3수준의 실험 조건으로 하였다. 90% 수시차광은 외부 일사량이 650 W·m-2일 때 차광되도록 하였다. 기온, 일사량, 엽온, 엽기온차, 광호흡은 90%의 수시차광에서 40% 수시차광과 무차광 처리 보다 낮은 값을 나타내었다. 최대 카르복실화속도, 광호흡율은 90% 수시차광 온실이 다른 처리구보다 유의하게 낮은 것으로 나타났다. 고온저항성을 나타내는 thermal breakdown 값은 90%의 수시차광에서 다른 처리구 보다 유의하게 높은 것으로 나타났다. 따라서, 90% 수시차광이 여름철 오이 재배에 있어 고온스트레스를 덜받는 생육환경을 조성하였다는 결과를 얻었다.

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