Horticulture, Environment, and Biotechnology

, Volume 54, Issue 6, pp 492–500 | Cite as

Growth and phenolic content of sowthistle grown in a closed-type plant production system with a UV-A or UV-B lamp

  • Min-Jeong Lee
  • Jung Eek Son
  • Myung-Min Oh
Research Report Protected Horticulture


This study was conducted to determine the effects of UV-A and UV-B wavelengths on the growth and content of antioxidant phenolic compounds in sowthistle (Ixeris dentata Nakai), a medicinal plant, grown in a closed plant-production system. In study I, sowthistle plants were continuously exposed to UV-A light. In study II, two UV treatments [repeated UV-B (R): 4 h·d−1 for 6 days, gradual UV-B (G): from 1 to 7 h·d−1 for 6 days] were applied to the sowthistle plants. As a result, contents of total phenolics and antioxidants in UV-A-treated plants were significantly (50 and 30%, respectively) higher than those in the control plants after 3 d of UV treatment without growth inhibition. Moreover, plants continuously exposed to UV-A for 5 d had 50% higher total flavonoid content than the control. The phenylalanine ammonia-lyase (PAL) activity supported the accumulation of phytochemicals in plants exposed to UV-A. The UV-B (R) treatment led to a more rapid decrease in the chlorophyll fluorescence ratio than UV-B (G) treatment. The UV-B (R) or UV-B (G) treatment produced more total phenolics, flavonoids, and antioxidants, although both UV-B treatments significantly inhibited plant growth measured at 2 days after treatment. The UV irradiation also enhanced PAL activity at 2 and 3 days after treatment, suggesting biosynthetic activation of secondary metabolites. Therefore, application of UV-A or UV-B light can be used as a strategy to improve antioxidant phenolic compounds of sowthistle plants grown in closed plant production systems.

Additional key words

antioxidants flavonoids Ixeris dentata Nakai PAL activity phytochemicals 


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Copyright information

© Korean Society for Horticultural Science 2013

Authors and Affiliations

  1. 1.Department of Horticultural ScienceChungbuk National UniversityCheongjuKorea
  2. 2.Department of Plant ScienceSeoul National UniversitySeoulKorea
  3. 3.Research Institute for Agriculture and Life SciencesSeoul National UniversitySeoulKorea

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