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Non-Targeted Metabolome Analysis with Low-Dose Selenate-Treated Arabidopsis
Hongqiao Li1, Tetsuya Mori2, Rintaro Moriyama1
1Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
Plants (Basel, Switzerland)
|February 13, 2025
Summary
Low doses of selenate (Se) in plants disrupt sulfur metabolism and energy production, leading to increased flavonoids for oxidative stress defense. This highlights a novel plant adaptation mechanism to selenium exposure.
Area of Science:
- Plant Biology
- Environmental Science
- Biochemistry
Background:
- Selenate is a common soil selenium form beneficial to plants.
- Selenate mimics sulfate assimilation, leading to seleno-amino acid incorporation and potential toxicity.
- Previous studies used high selenate concentrations, leaving low-dose effects unclear.
Purpose of the Study:
- To investigate the metabolic effects of low-dose selenate (2 µM) on plants.
- To compare selenate's impact on plant metabolism with sulfur deficiency.
- To elucidate novel plant stress adaptation mechanisms.
Main Methods:
- Non-targeted metabolome analysis of plants treated with 2 µM selenate.
- Analysis of sulfur assimilates, amino acids, flavonoids, and glutathione levels.
- Comparison of metabolic profiles under selenate treatment versus sulfur deficiency.
Main Results:
- 2 µM selenate decreased sulfur assimilates and amino acids.
- Flavonoid accumulation increased, while glutathione levels remained stable.
- Selenate treatment disrupted sulfur assimilation, amino acid biosynthesis, and energy metabolism.
Conclusions:
- Low-dose selenate primarily affects energy metabolism and sulfur assimilation.
- Decreased amino acid levels and altered S metabolism are key selenate-induced changes.
- Flavonoid accumulation suggests an adaptive response to mitigate oxidative stress from selenate.
