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http://dx.doi.org/10.12791/KSBEC.2021.30.1.001

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

Kim, Jae Kyung (Department of Horticulture, Kangwon National University)
Jang, Dong Cheol (Department of Horticulture, Kangwon National University)
Kang, Ho Min (Department of Horticulture, Kangwon National University)
Nam, Ki Jung (Cooperative Management Institute, Agricultural Cooperative University)
Lee, Mun Haeng (Fruit Vegetable Research Institute Chungchengnam-Do A.R.E.S)
Na, Jong Kuk (Division of Future Agriculture Convergence, Kangwon National University)
Choi, Ki Young (Division of Future Agriculture Convergence, Kangwon National University)
Publication Information
Journal of Bio-Environment Control / v.30, no.1, 2021 , pp. 1-9 More about this Journal
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℃ 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;
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