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Ecophysiological differences between five mangrove seedlings under heavy metal stress.

Yue-Yue Zhou1, You-Shao Wang2, Aniefiok Ini Inyang1

  • 1State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; Daya Bay Marine Biology Research Station, Chinese Academy of Sciences, Shenzhen 518121, China; Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China.

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PubMed
Summary

Mangrove plants exhibit varying responses to heavy metal stress. Avicennia marina shows higher tolerance, with significant antioxidant enzyme activity (superoxide dismutase, peroxidase, catalase) and lipid peroxidation levels.

Keywords:
CatalaseHeavy metalsLipid peroxidationMangrove plantsPeroxidaseSuperoxide dismutase

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Area of Science:

  • Environmental Science
  • Plant Physiology
  • Biochemistry

Background:

  • Mangrove ecosystems are vital coastal habitats.
  • Heavy metal contamination poses a significant threat to plant life.
  • Understanding plant responses to heavy metals is crucial for conservation.

Purpose of the Study:

  • To investigate the effects of heavy metal stress on antioxidant activities in five mangrove species.
  • To assess lipid peroxidation levels as an indicator of oxidative damage.
  • To identify key biochemical markers and tolerant species under heavy metal exposure.

Main Methods:

  • Analysis of protein concentrations, lipid peroxidation (MDA), and antioxidant enzymes (SOD, POD, CAT) in mangrove leaves.
  • Exposure of five mangrove species to heavy metal stress (Cu2+, Cd2+).
  • Statistical analysis and Principal Component Analysis (PCA) to determine major response indices.

Main Results:

  • Significant variations in protein concentrations were observed across species and metal treatments.
  • Avicennia marina exhibited notably higher lipid peroxidation (MDA) content compared to other species.
  • Elevated levels of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were found in A. marina, A. corniculatum, and B. gymnorrhiza.

Conclusions:

  • Antioxidant enzymes (POD, SOD) and lipid peroxidation (MDA) are key indicators of heavy metal stress response in mangroves.
  • Avicennia marina demonstrates superior tolerance to heavy metal stress compared to the other studied mangrove species.
  • Findings highlight the differential physiological responses of mangroves to heavy metal contamination.