Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Light dependent arsenic uptake and growth in Lactuca sativa L.

  • Hyun-Gi Min (Ojeong Resilience Institute, Korea University) ;
  • Eunjee Kim (Division of Environmental Science and Ecological Engineering, College of Life Science and Biotechnology, Korea University) ;
  • Min-Suk Kim (Waste Resources Management Division Resource Recirculation Bureau, Ministry of Environment) ;
  • Jeong-Gyu Kim (Division of Environmental Science and Ecological Engineering, College of Life Science and Biotechnology, Korea University)
  • Received : 2023.07.24
  • Accepted : 2023.12.26
  • Published : 2023.12.31
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Abstract

Along with other heavy metals, arsenic (As) is one among the substances most harmful to living organisms including humans. Owing to its morphological similarity to phosphorus, the uptake of As is influenced by photosynthesis and the phosphorus uptake pathway. In this study, we varied arsenic exposure and light intensity during nutrient solution cultivation of lettuce (Lactuca sativa L.) to determine the effect of these two factors on arsenic uptake, lettuce growth, and electron transfer in photosystem II. In the treatment exposed to 30 μmol L-1 of arsenic, the shoot arsenic concentration increased from 4.73 mg kg-1 to 18.97 mg kg-1 as the light intensity increased from 22 to 122 μmol m-2 s-1. The water content and ET2o/RC of the shoots were not affected by arsenic at low light intensity; however, at optimal light intensity, they decreased progressively with arsenic exposure. Increased light intensity stimulated the growth of plant roots and shoots; contrarily, the difference in growth decreased as the concentration of As exposure increased. The results of this study suggest that the effect of As on plant growth is dependent on light intensity; in particular, an increase in light intensity can increase the uptake of As, thereby affecting plant growth and As toxicity.

Keywords

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2021R1A6A1A10045235) and partly granted by Korea university (k230031).

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