Redox Homeostasis Disclosed in the Saltmarsh Plant Halimione portulacoides upon Short Waterborne Exposure to Inorganic Mercury
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View abstract on PubMed
Summary
This summary is machine-generated.Saltmarsh plants (Halimione portulacoides) show rapid antioxidant responses to inorganic mercury (iHg) exposure. Contaminated site plants exhibit enhanced tolerance and biochemical resilience to mercury toxicity.
Area Of Science
- Environmental toxicology
- Plant physiology
- Biochemistry
Background
- Mercury contamination poses a threat to coastal ecosystems.
- Understanding plant adaptive mechanisms to heavy metals is crucial for ecological risk assessment.
- Halimione portulacoides is a key saltmarsh species sensitive to environmental stressors.
Purpose Of The Study
- To investigate the short-term adaptive responses of Halimione portulacoides to inorganic mercury (iHg).
- To assess mercury accumulation, redox homeostasis, and physiological changes in roots and leaves.
- To evaluate the influence of contamination background and abiotic factors on mercury tolerance.
Main Methods
- Exposure of H. portulacoides to realistic iHg levels for 2 and 4 hours.
- Collection of plants from both contaminated (CONT) and reference (REF) sites.
- Analysis of total mercury, antioxidant enzymes, lipid peroxidation (LPO), and photosynthetic activity.
Main Results
- Low mercury accumulation in roots with no translocation to aerial parts observed.
- Contaminated site plants showed higher iHg uptake in winter but exhibited greater antioxidant capacity.
- CONT leaves displayed higher thresholds for antioxidant induction and lower LPO levels under iHg stress.
- Photosynthetic activity remained unimpaired, indicating tolerance to short-term iHg exposure.
Conclusions
- Halimione portulacoides demonstrates rapid biochemical adaptation to iHg, with biochemical changes preceding accumulation.
- Contaminated site plants possess pre-existing tolerance mechanisms, suggesting adaptation to mercury stress.
- The plant's ability to maintain physiological functions highlights its resilience to short-term mercury exposure.
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