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2018 Vol.27, Issue 2 Preview Page
Development and Validation of a Canopy Photosynthetic Rate Model of Lettuce Using Light Intensity, CO2 Concentration, and Day after Transplanting in a Plant Factory

광도, CO2 농도 및 정식 후 생육시기에 따른 식물공장 재배 상추의 군락 광합성 모델 확립

Dae Ho Jung1†
,
Tae Young Kim1†
,
Young-Yeol Cho2
,
Jung Eek Son1*
정 대호1†
,
김 태영1†
,
조 영열2
,
손 정익1*
1Department of Plant Science, Seoul National University, Seoul 08826, Korea
2Major of Horticultural Science, Jeju National University, Jeju 63243, Korea
1서울대학교 식물생산과학부
2제주대학교 원예환경전공

• These authors equally contributed to this work

*Corresponding author: sjeenv@snu.ac.kr
30 April 2018. pp. 132-139
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Abstract

The photosynthetic rate is an indicator of the growth state and growth rate of crops and is an important factor in constructing efficient production systems. The objective of this study was to develop a canopy photosynthetic rate model of romaine lettuce using the three variables of CO2 concentration, light intensity, and growth stage. The canopy photosynthetic rates of the lettuce were measured at five different CO2 concentrations (600- 2,200μmol·mol-1), five light intensities (60-340μmol·m-2·s-1), and four growth stages (5-20 days after transplanting) in three closed acrylic chambers (1.0 × 0.8 × 0.5m). A simple multiplication model expressed by multiplying three single-variable models and the modified rectangular hyperbola model including photochemical efficiency, carboxylation conductance, and dark respiration, which vary with growth stage, were also considered. In validation, the R2 value was 0.923 in the simple multiplication model, while it was 0.941 in the modified rectangular hyperbola model. The modified rectangular hyperbola model appeared to be more appropriate than the simple multiplication model in expressing canopy photosynthetic rates. The model developed in this study will contribute to the determination of an optimal CO2 concentration and light intensity with the growth stage of lettuce in plant factories..

Keywords
growth stage
photosynthesis model
rectangular hyperbola model
regression model

작물의 생산량은 광합성과 밀접한 관계가 있으며, 광합성 속도는 다양한 환경 요인에 의해 변화한다. 광합성 속도는 작물의 생육 상태나 생육 속도를 판단하는 지표로 사용되며, 작물 재배 시설을 구축하는 데 고 려해야 하는 중요한 요인이다. 이 연구의 목적은 광도, CO2 농도 및 생육 단계에 의해 변화하는 로메인 상추 의 군락 광합성 속도 모델을 개발하는 것이다. 군락 광합성 속도는 정식 후 5, 10, 15, 20 일차에서 5단계의 CO2 농도(600-2,200μmol·mol-1)와 5단계의 광조건(60-340μmol·m-2·s-1)이 처리된 3개의 밀폐 아크릴 챔버(1.0 × 0.8 × 0.5m) 내에서 측정하였다. 먼저 세 가지 환경 요인을 사용하는 식들을 곱하여 만든 단순곱 모델을 구성 하였다. 이와 동시에 생육 시기에 따라 변화하는 광화학 이용효율과 카르복실화 컨덕턴스, 호흡에 의한 이산화 탄소 발생 속도를 포함하는 수정 직각쌍곡선 모델을 구성하여 단순곱 모델과 비교하였다. 검증 결과, 단순곱 모델의 R2는 0.923이었으며, 수정 직각쌍곡선 모델의 R2는 0.941을 나타내었다. 따라서 수정 직각쌍곡선 모델 이 광도, CO2 농도, 생육 단계의 3 변수에 따른 군락 광합성 속도를 표현하는 데 더욱 적합한 것으로 판단하 였다. 본 연구에서 개발된 군락 광합성 모델은 식물공장에서 상추 재배를 위해 생육 단계별로 설정해야 할 최 적의 광도와 CO2 농도를 결정하는 데 도움이 될 것으로 생각된다.

키워드
생육 단계
광합성 모델
직각쌍곡선 모델
회귀 모델
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Information
  • Publisher :The Korean Society for Bio-Environment Control
  • Publisher(Ko) :(사)한국생물환경조절학회
  • Journal Title :Protected Horticulture and Plant Factory
  • Journal Title(Ko) :시설원예ㆍ식물공장
  • Volume : 27
  • No :2
  • Pages :132-139
  • Received Date : 2018-02-27
  • Revised Date : 2018-03-22
  • Accepted Date : 2018-04-02
  • DOI :https://doi.org/10.12791/KSBEC.2018.27.2.132
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