Light dependent arsenic uptake and growth in Lactuca sativa L.

서지정보

ㆍ발행기관 : 한국환경생물학회 ㆍ수록지정보 : 환경생물 / 41권 / 4호
ㆍ저자명 : Hyun-Gi Min, Eunjee Kim, Min-Suk Kim, Jeong-Gyu Kim

목차

1. INTRODUCTION
2. MATERIALS AND METHODS
2.1. Plant material and treatment conditions
2.2. Measurement of fresh mass androot length
2.3. Estimation of As content
2.4. Estimation of photosynthetic activities
2.5. Statistical analysis
3. RESULTS AND DISCUSSION
3.1. Arsenic accumulation in lettuce shootsand roots
3.2. Root and shoot growth
3.3. Impact of arsenic exposure onphotosynthesis:Fluorescence of chlorophyll a
3.4. Correlation coefficient withAs concentration in plant
4. CONCLUSION
CRediT authorship contribution statement
Declaration of Competing Interest
ACKNOWLEDGEMENTS
REFERENCES

영어 초록

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.

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