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2024 Vol.33, Issue 4

Original Articles

Effect of Daily Light Integral on the Growth, Photosynthesis and Chlorophyll Fluorescence of Cucumber Plants in Pot Soil Culture

토양 화분재배에서 오이의 생육, 광합성, 엽록소 형광에 미치는 일적산광량의 영향

Minkyung Kim1†
,
Md Rayhan Ahmed Shawon12†
,
Md Golam Rabbani1
,
Ki Young Choi13*
김 민경1†
,
샤 원12†
,
라바니 엠디 골람1
,
최 기영13*
1Department of Agriculture and Industries, Kangwon National University Graduate School, Chuncheon 24341, Korea
2Environmental Research Institute, Kangwon National University, Chuncheon 24341, Korea
3Department of Smart Farm and Agricultural Industry, Kangwon National University, Chuncheon 24341, Korea
1강원대학교 농산업학과 대학원생
2강원대학교 환경연구소 박사후연구원
3강원대학교 스마트팜농산업학과 교수
*Corresponding Author
†These authors contributed equally to this work
31 October 2024. pp. 179-188
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Abstract

Light is a crucial factor in crop cultivation. This study aimed to determine the effect of daily light integral (DLI) on the growth of cucumber plants, physiological response, irrigation amount and soil water tension (SWT) in pot soil cultivation. Seedlings were grown in pots filled with soil and treated under three different DLIs at 2.88, 11.52 and 20.16 mol m-2 d-1 indicated LS, LM and LH respectively) for three weeks. It was applied using white LED (light-emitting diode) light. The results showed that the leaf area and shoot’s fresh and dry weights of plants were significantly higher in LM-treated plants than those grown in LS and LH treatments. In addition, plant height, root surface area and SPAD value were lowest in plants grown in LS treatment. There was no significant variation in number of nodes and stem diameter of plants among the treatments. The photosynthesis rate was higher in LM (4.34 µmol CO2 m-2 s-1) and LH-treated (4.81 µmol CO2 m-2 s-1) plants than in LS (0.92 µmol CO2 m-2 s-1). However, the concentration of intercellular CO2 in leaves was higher in LS-treated plants. Plant stomatal conductance, transpiration rate and the Fv/Fm (maximum quantum yield of photosystem-II) ratios were not significantly different between the treatments. Furthermore, total irrigation volume in different treatments was varies with DLI values and it was highest in LH treatment (10.2 L/plant). SWT was not significantly different between the treatments LS and LM but observed low pressure (-30 kPa) in LH treatment. The principal component analysis (PCA) illustrated leaf area, shoot fresh weight, photosynthesis rate and stomatal conductance of plants has a positive correlation. These results suggest that at the initial stage of cucumber plants, daily light integral 11.52 mol m-2 d-1 was preferable for their growth and development and worthwhile based on irrigation amount than other treatments.

Keywords
fresh weight
irrigation
root surface area
soil water tension
SPAD value

빛은 작물 재배에 중요한 요소이다. 본 연구는 토양 화분재배에서 일적산광량(daily light integral, DLI)이 오이의 생육, 생리적 반응, 관수량 및 토양수분 장력(soil water tension, SWT)에 미치는 영향을 구명하고자 하였다. 오이 재배는 토양으로 충진한 화분에서 3주 동안 세 수준의 DLI[2.88, 11.52 또는 20.16 mol·m-2·d-1, 각 LS, LM 및 LH]를 처리하여 수행되었다. 광량 처리는 백색 LED 인공 광원을 사용하였다. 식물체의 엽면적과 지상부 생체중, 건물중은 LM 처리에서 자란 식물이 LS와 LH 처리에서 자란 식물 보다 유의하게 높았다. 초장과 뿌리 표면적, SPAD값(엽록소함량)은 LS 처리에서 가장 낮았다. 식물체의 마디 수와 줄기 직경은 처리 간에 유의한 차이가 없었다. 광합성 속도는 LM(4.34 µmol·CO2·m-2·s-1)과 LH 처리(4.81 µmol·CO2·m-2·s-1) 식물에서 LS 처리(0.92 µmol·CO2·m-2·s-1)보다 높았다. 그러나 엽육 내 CO2 농도는 LS 처리 식물에서 더 높았다. 기공 전도도, 증산 속도 및 Fv/Fm(광계-II의 최대 양자 수율) 비율은 처리 간에 유의한 차이가 없었다. 총 관수량은 DLI가 높을수록 많아 LH 처리(10.2 L/주)에서 가장 많았다. SWT는 LS와 LM 처리 간에 유의한 차이가 없었지만 LH 처리에서 낮았다(-30 kPa). 주성분 분석(PCA)은 식물의 엽면적, 지상부의 생체중, 광합성 속도 및 기공 전도도의 양의 상관관계를 나타냈다. 이상의 결과, 광도 200 µmol·m-2·s-1로 3주간 적용된 일적산광량 11.52 mol·m-2·d-1 조건이 포트 묘 오이 생장과 발달에 더 유리하였다.

키워드
SPAD 값
관수
뿌리 표면적
생체중
토양 수분 장력
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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 : 33
  • No :4
  • Pages :179-188
  • Received Date : 2024-06-10
  • Revised Date : 2024-08-05
  • Accepted Date : 2024-09-02
  • DOI :https://doi.org/10.12791/KSBEC.2024.33.4.179
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