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Determination of Inorganic Arsenic in a Wide Range of Food Matrices using Hydride Generation - Atomic Absorption Spectrometry.
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Interference between arsenic-induced toxicity and hypoxia.

Vijay Kumar1,2, Lara Vogelsang1, Thorsten Seidel1

  • 1Department of Biochemistry and Physiology of Plants, Faculty of Biology, University of Bielefeld, Bielefeld, Germany.

Plant, Cell & Environment
|September 11, 2018
PubMed
Summary
This summary is machine-generated.

Plants exposed to combined arsenic toxicity and hypoxia show impaired growth and altered nutrient levels. Recovery is hindered by persistent stress effects, highlighting complex interactions between environmental challenges.

Keywords:
arsenic toxicitycis-OPDAferredoxinglutathionehormoneshypoxiaredox sensorsredox signallingstress combinationtranscriptome

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Area of Science:

  • Plant Biology
  • Environmental Stress Physiology
  • Toxicology

Background:

  • Plants in nature frequently encounter multiple environmental stressors simultaneously.
  • Arsenic (As) toxicity and hypoxia (Hpx) are common abiotic stresses that can co-occur, particularly in root environments.

Purpose of the Study:

  • To investigate the combined effects of arsenic toxicity and hypoxia on Arabidopsis thaliana growth and physiology.
  • To elucidate the molecular and elemental changes induced by these combinatorial stresses and their impact on plant recovery.

Main Methods:

  • Arabidopsis thaliana were subjected to arsenic (As) toxicity, hypoxia (Hpx), and combined HpxAs treatments.
  • Growth parameters, root and leaf development, recovery upon reaeration, root glutathione redox potential, elemental composition (Ca, Mg, P, K), and transcriptomic changes were analyzed.

Main Results:

  • Hypoxia severely inhibited root growth, while arsenic inhibited both root and leaf growth.
  • Combined HpxAs treatment led to compromised recovery upon reaeration, suggesting persistent stress effects.
  • Root glutathione redox potential became more oxidized under Hpx and HpxAs, correlating with growth arrest.
  • Significant alterations in elemental composition, notably a decline in potassium, and changes in the potassium-related transcriptome were observed.
  • Photosynthesis parameters were largely unaffected, and carbohydrate accumulation indicated no limitation.

Conclusions:

  • Combined arsenic and hypoxia stresses induce synergistic and antagonistic effects on plant growth and physiology.
  • Disturbed potassium homeostasis is a key factor contributing to the observed growth phenotype under combined stress.
  • The study reveals complex interactions between arsenic and hypoxia, impacting plant stress responses and recovery mechanisms.