생물환경조절학회지 (Journal of Bio-Environment Control)

  • 제29권1호
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  • Pages.43-51
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  • 2020
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  • 1229-4675(pISSN)
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  • 2765-3641(eISSN)
한국생물환경조절학회 (The Korean Society for Bio-Environment Control)
권호 표지
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DOI QR Code

생육 챔버를 이용하여 광도 및 이산화탄소 농도 변수를 갖는 상추(Lactuca sativa L.)의 군락 광합성 곡선의 효율적 도출 방법

An Efficient Method for Establishing Canopy Photosynthesis Curves of Lettuce (Lactuca sativa L.) with Light Intensity and CO2 Concentration Variables Using Controlled Growth Chamber

  • 정대호 (서울대학교 식물생산과학부 및 농업생명과학연구원) ;
  • 김태영 (서울대학교 식물생산과학부 및 농업생명과학연구원) ;
  • 손정익 (서울대학교 식물생산과학부 및 농업생명과학연구원)
  • Jung, Dae Ho (Department of Plant Science and Research Institute of Agriculture and Life Sciences, Seoul National University) ;
  • Kim, Tae Young (Department of Plant Science and Research Institute of Agriculture and Life Sciences, Seoul National University) ;
  • Son, Jung Eek (Department of Plant Science and Research Institute of Agriculture and Life Sciences, Seoul National University)
  • 투고 : 2019.12.03
  • 심사 : 2020.01.16
  • 발행 : 2020.01.31
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초록

군락 광합성 모델의 도출을 위하여 생육 챔버가 필요하며, 이를 위한 광합성의 효율적인 측정 방법이 필요하다. 본 연구의 목적은 내부 환경 제어가 가능한 생육 챔버를 이용하여 광도 및 이산화탄소 농도 변수를 갖는 로메인상추(Lactuca sativa L.)의 군락 광합성 곡선을 도출하는 방법을 확립하는 것이다. 실험에 사용한 상추는 식물공장 모듈에서 재배되었으며, 군락 광합성을 측정하기 위하여 아크릴로 제작된 생육 챔버(1.0x0.8x0.5m)를 이용하였다. 첫 번째로, 다음의 두 방법을 적용하여 측정된 군락 광합성 속도를 통해 각 방법의 시정수를 계산하여 비교하였다. 즉, 1) CO2 농도를 고정(1,000μmol·mol-1) 하고 광도를 변화(340, 270, 200, and 130μmol·m-2·s-1) 시키거나, 2) 광도를 고정(200μmol·m-2·s-1)하고 CO2 농도를 변화(600, 1,000, 1,400, and 1,800μmol·mol-1) 시켰다. 두 번째로, 1)과 2)의 방식을 적용하여 군락 광합성을 측정했을 때, 특정 광도(200μmol·m-2·s-1)와 특정 CO2 농도(1,000μmol·mol-1)에서 측정된 군락 광합성 속도 값을 비교하였다. 실험 결과 CO2 농도를 변화시키는 방식의 시정수는 광도를 변화시키는 방식에 비해 3.2배 큰 값을 나타내었다. 광도를 변화시키며 측정할 때 군락 광합성 속도는 1분 이내에 안정되었고, CO2 농도를 변화시킬 경우에는 6분 이상의 시간이 소요되었다. 따라서 광도를 변화시키는 측정 방식이 생육 챔버를 이용하여 작물의 군락 광합성 속도를 측정할 때 적합한 방식임을 확인하였다.

For developing a canopy photosynthesis model, an efficient method to measure the photosynthetic rate in a growth chamber is required. The objective of this study was to develop a method for establishing canopy photosynthetic rate curves of romaine lettuce (Lactuca sativa L.) with light intensity and CO2 concentration variables using controlled growth chamber. The plants were grown in plant factory modules, and the canopy photosynthesis rates were measured in sealed growth chambers made of acrylic (1.0 × 0.8 × 0.5 m). First, the canopy photosynthetic rates of the plants were measured, and then the time constants were compared between two application methods: 1) changing light intensity (340, 270, 200, and 130 μmol·m-2·s-1) at a fixed CO2 concentration (1,000 μmol·mol-1) and 2) changing CO2 concentration (600, 1,000, 1,400, and 1,800 μmol·mol-1) at a fixed light intensity (200 μmol·m-2·s-1). Second, the canopy photosynthetic rates were measured by changing the light intensity at a CO2 concentration of 1,000 μmol·mol-1 and compared with those measured by changing the CO2 concentration at a light intensity of 200 μmol·m-2·s-1. The time constant when changing the CO2 concentration at the fixed light intensity was 3.2 times longer, and the deviation in photosynthetic rate was larger than when changing the light intensity. The canopy photosynthetic rate was obtained stably with a time lag of one min when changing the light intensity, while a time lag of six min or longer was required when changing the CO2 concentration. Therefore, changing the light intensity at a fixed CO2 concentration is more appropriate for short-term measurement of canopy photosynthesis using a growth chamber.

키워드

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