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2021 Vol.30, Issue 1

Original Articles

Effects of Light Intensity and Electrical Conductivity Level on Photosynthesis, Growth and Functional Material Contents of Lactuca indica L. ‘Sunhyang’ in Hydroponics

수경재배에서 광도와 양액 농도가 베이비 산채 왕고들빼기 ‘선향’ 광합성과 생육 및 기능성 물질 함량에 미치는 영향

Jae Kyung Kim1
,
Dong Cheol Jang2
,
Ho Min Kang3
,
Ki Jung Nam4
,
Mun Haeng Lee5
,
Jong Kuk Na6
,
Ki Young Choi6†
김 재경1
,
장 동철2
,
강 호민3
,
남 기정4
,
이 문행5
,
나 종국6
,
최 기영6†
1Graduate Student, Department of Horticulture, Kangwon National University, Chuncheon 24341, Korea
2Post Doctor, Department of Horticulture, Kangwon National University, Chuncheon 24341, Korea
3Professor, Department of Horticulture, Kangwon National University, Chuncheon 24341, Korea
4Doctor, Cooperative Management Institute, Agricultural Cooperative University, Gyeongi 10292, Korea
5Researcher, Fruit Vegetable Research Institute Chungchengnam-Do A.R.E.S, Buyeo 32514, Korea
6Division of Future Agriculture Convergence, Kangwon National University, Chuncheon 24341, Korea
1강원대학교 원예학과 대학원생
2강원대학교 원예학과 박사후 연구원
3강원대학교 원예학과 교수
4농협대학교 협동조합경영연구소 교수
5충남농업기술원 과채 연구소 연구사
6강원대학교 미래농업융합학부 교수
*choiky@kangwon.ac.kr
31 January 2021. pp. 1-9
PDF XML Citation
Abstract

This study was conducted to examine the changes of photosynthesis, growth, chlorophyll contents and functional material contents in light intensity and EC concentration of wild baby leaf vegetable, Indian lettuce (Lactuca indica L. cv. ‘Sunhyang’) in DFT hydroponics. The cultivation environment was 25±1°C of temperature and 60±5% of relative humidity in growth system. At 14 days after sowing, combination effect of light intensity (Photosynthetic Photon Flux Density (PPFD 100, 250, 500 μmol·m-2·s-1) and EC level (EC 0.8, 1.4, 2.0 dS․m-1) of nutrient solution was determined at the baby leaf stage. The photosynthesis rate, stomatal conductance, transpiration rate and water use efficiency of Indian lettuce increased as the light intensity increased. The photosynthesis rate and water use efficiency were highest in PPFD 500-EC 1.4 and PPFD 500-EC 2.0 treatment. The chlorophyll content decreased as the light intensity increased, but chlorophyll a/b ratio increased. Leaf water content and specific leaf area decreased as light intensity increased and a negative correlation (p < 0.001) was recognized. Plant height was the longest in PPFD 100-EC 0.8 and leaf number, fresh weight and dry weight were the highest in PPFD 500-EC 2.0. Anthocyanin and total phenolic compounds were the highest in PPFD 500-EC 1.4 and 2.0 treatment, and antioxidant scavenging ability (DPPH) was high in PPFD 250 and 500 treatments. Considering the growth and functional material contents, the proper light intensity and EC level for hydroponic cultivation of Indian lettuce is PPFD 500-EC 2.0, and PPFD 100 and 250, which are low light conditions, EC 0.8 is suitable for growth.

Keywords
chlorophyll content
leaf water content
phenolic contents
water use efficiency

본 실험은 수경재배에서의 왕고들빼기 ‘선향’의 광도와 양액 농도가 광합성과 생육, 기능성 물질함량의 변화를 알아보고자 수행했다. 재배 환경은 온도 25±1℃, 상대습도 60±5%가 조절되는 생장 시스템에서 담액 수경 방식으로 재배하였다. 파종 14일 후, 광도 3수준(PPFD 100, 250, 500μmol·m-2·s-1)과 양액 농도 3수준(EC 0.8, 1.4, 2.0dS·m-1)를 조합하여 어린잎 채소 크기에 도달하였을 때 수확하여 분석하였다. 왕고들빼기 선향의 광합성율, 기공전도도, 증산율, 수분이용효율은 광도가 높을수록 증가하였다. 광합성율과 수분이용효울은 PPFD 500-EC 1.4, PPFD 500-EC 2.0 처리에서 가장 높았다. 엽록소 함량은 광도가 높을수록 감소하였며 엽록소 a/b 비율은 광도가 증가할수록 증가하였다. 잎수분함유량(LWC)와 비엽면적(SLA)는 광도가 높을수록 감소하여 부상관(p < 0.001)을 가졌다. 초장은 PPFD 100-EC0.8에서 가장 길었고, 엽수, 생체중, 건물중은 PPFD 500-EC2.0에서 가장 높았다. 기능성 물질인 안토시아닌과 총 페놀화합물은 PPFD 500-EC 1.4, 2.0 처리에서 가장 높았고, 항산화 소거 능력(DPPH)은 PPFD 250, 500에서 높았다. 생육과 기능성물질 함량 증진을 고려했을 때 왕고들빼기 수경재배 시 적정 광도와 EC는 PPFD 500-EC 2.0dS·m-1이며, 저광 조건인 PPFD 100, 250에서는 EC 0.8dS·m-1재배가 적합하였다.

키워드
수분이용효율
엽록소 함량
잎수분함유량
페놀 화합물
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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 : 30
  • No :1
  • Pages :1-9
  • Received Date : 2020-10-12
  • Revised Date : 2020-12-07
  • Accepted Date : 2020-12-10
  • DOI :https://doi.org/10.12791/KSBEC.2021.30.1.001
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