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Open AccessArticle

Effect of Different Combinations of Red and Blue LED Light on Growth Characteristics and Pigment Content of In Vitro Tomato Plantlets

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Department of Biosystems and Technology, Swedish University of Agricultural Sciences, Box 103, 23053 Alnarp, Sweden
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Bioresource Engineering Department, Macdonald Stewart Building, McGill University, 21111 Lakeshore, Ste-Anne-de-Bellevue, H9X 3V9, QC, Canada
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Department of Bio-Health Technology, College of Biomedical Science, Kangwon National University, Chuncheon 24341, Korea
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Authors to whom correspondence should be addressed.
Agriculture 2019, 9(9), 196; https://doi.org/10.3390/agriculture9090196
Received: 13 August 2019 / Revised: 2 September 2019 / Accepted: 5 September 2019 / Published: 9 September 2019
The aim of this study was to evaluate the growth characteristics and pigment content of tomato plantlets grown under various ratios of red (R) (661 nm) and blue (B) (449 nm) LED light. In this study, three different ratios of R and B (RB) light such as 5:01, 10:01, and 19:01 along with R (100%) were used. The photosynthetic photon flux density (PPFD), and photoperiod of the growth chamber was 120 ± 5 μmol m−2s−1 and 16/8 h (day/night), respectively. Tomato plantlets were cultured for six weeks in the growth chamber. It was shown that tomato plantlets had higher photosynthesis rate, higher pigments content, higher growth characteristics (e.g., number of leaves, leaf area, shoot number, root number, root length, dry, and fresh mass), and greater surviving rate under the R:B = 10:01 ratio among the treatments. The plantlets showed at least a threefold decrease in photosynthesis rate, as well as a significant abnormal stem elongation when grown under 100% R light. It is concluded that the RB ratio of 10:01 showed excellent performance in all growth parameters. This result has shown that the optimum lighting environment improves tomato plantlet cultures in vitro. View Full-Text
Keywords: light-emitting diode (LED); tomato plantlets; biomass; photosynthesis; pigments light-emitting diode (LED); tomato plantlets; biomass; photosynthesis; pigments
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Naznin, M.T.; Lefsrud, M.; Azad, M.O.K.; Park, C.H. Effect of Different Combinations of Red and Blue LED Light on Growth Characteristics and Pigment Content of In Vitro Tomato Plantlets. Agriculture 2019, 9, 196.

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