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2025 Vol.34, Issue 2 Preview Page

Original Articles

The Effects of Microgravity on the Chlorophyll Fluorescence Respnose of Lettuce

미세중력이 상추의 생장 및 엽록소 형광 반응에 미치는 영향

Sang-Min Kim1
,
Jung-Hoo Kook1
,
Oluwasegun Moses Ogundele2
,
Jung-In Choi3
,
Hyeon-Tae Kim4*
김 상민1
,
국 중후1
,
오군델레 올루와세군 모세스2
,
최 정인3
,
김 현태4*
1Graduate Student, Department of Smartfarm, Gyeongsang National University (Institute of Smart Space Agriculture), Jinju 52828, Korea
2Graduate Student, Department of Bio-systems Engineering, Gyeongsang National University, Jinju 52828, Korea
3Undergaduate Student, Department of Bio-industrial Machinery Engineering, College of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Korea
4Professor, Department of Bio-industrial Machinery Engineering, College of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Korea
1경상국립대학교 스마트팜학과 대학원생
2경상국립대학교 바이오시스템공학과 대학원생
3경상국립대학교 생물산업기계공학과 학사과정
4경상국립대학교 생물산업기계공학과 교수
*Corresponding Author
30 April 2025. pp. 188-197
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Abstract

As scientific interest extends beyond Earth, research on space agriculture has become essential for supporting human survival in extraterrestrial environments. This study examined the effects of altered gravity on lettuce growth and photosynthesis using a 2-D clinostat. Plants were placed at the center, 6 cm, and 12 cm from the rotation axis and compared to a control over nine days. Growth was assessed via leaf length and width, and photosynthetic responses were analyzed using OJIP chlorophyll fluorescence and photochemical indicators. While leaf length showed no significant differences, leaf width decreased significantly in the a6 and a12 groups. These groups also showed reduced photosystem II (PSII) activity and electron transport efficiency, indicating increased photosynthetic stress and decreased energy use. Elevated fluorescence at the J and P steps highlighted the photosynthetic system’s sensitivity to greater radial distances. This study offers quantitative insights into plant responses under gravity-compensated conditions and provides a foundation for optimizing space farming systems.

Keywords
chlorophyll fluorescence
gravity stress
plant growth
lettuce
space-agriculture

지구를 넘어선 과학적 관심이 확장됨에 따라, 우주 농업에 대한 연구는 외계 환경에서 인간 생존을 지원하기 위한 필수 요소가 되었다. 본 연구는 2차원 클리노스테이트(2-D clinostat)를 이용하여 중력 변화가 상추의 생장과 광합성에 미치는 영향을 분석하였다. 식물은 회전축의 중심, 6cm, 12cm 떨어진 위치에 배치되었으며, 대조군과 함께 9일 동안 비교되었다. 생장은 엽장 및 엽폭을 통해 평가하였고, 광합성 반응은 OJIP 엽록소 형광 및 광화학 지표를 통해 분석하였다. 엽장은 유의한 차이를 보이지 않았지만, 엽폭은 6cm 및 12cm 처리구에서 유의하게 감소하였다. 이들 처리구에서는 광계 II(PSII) 활성과 전자 전달 효율이 감소하여 광합성 스트레스 증가와 에너지 이용 효율 저하를 나타냈다. 특히, J단계와 P단계에서의 형광 증가 현상은 더 큰 반경 거리에서 광합성계의 민감성이 높아졌음을 시사한다. 본 연구는 중력 보상 조건 하에서 식물의 생리적 반응에 대한 정량적 통찰을 제공하며, 우주 농업 시스템의 최적화를 위한 기초 자료를 제공한다.

키워드
광계 효율
광합성능
다차원 클리노스테이트
미래 농업 기술
중력 상쇄
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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 : 34
  • No :2
  • Pages :188-197
  • Received Date : 2025-04-14
  • Revised Date : 2025-04-24
  • Accepted Date : 2025-04-27
  • DOI :https://doi.org/10.12791/KSBEC.2025.34.2.188
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