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Simultaneous Measurement of Superoxide/Hydrogen Peroxide and NADH Production by Flavin-containing Mitochondrial Dehydrogenases
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Published on: February 24, 2018

NADPH oxidase involvement in cellular integrity.

Neil Macpherson1, Seiji Takeda, Zhonglin Shang

  • 1Department of Plant Sciences, University of Cambridge, Cambridge, CB2 3EA, UK.

Planta
|March 5, 2008
PubMed
Summary
This summary is machine-generated.

NADPH oxidase (an enzyme) is crucial for plant cell wall strength and adaptation. Its absence weakens walls, leading to root hair bursting, while its presence aids protoplast expansion.

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Area of Science:

  • Plant Biology
  • Cell Biology
  • Biochemistry

Background:

  • NADPH oxidase activity generates reactive oxygen species (ROS).
  • ROS are implicated in plant adaptation, development, and cell wall dynamics.
  • The specific role of NADPH oxidase in root hair cell wall integrity requires further elucidation.

Purpose of the Study:

  • To investigate the role of NADPH oxidase, specifically RHD2/AtRBOHC, in plant cell wall strength and root hair development.
  • To determine how NADPH oxidase activity influences root hair bulge robustness and bursting under osmotic stress.

Main Methods:

  • Comparative analysis of NADPH oxidase mutant (rhd2/Atrbohc) and wild-type (WT) plants.
  • Assessment of root epidermal wall integrity using wall-degrading enzymes.
  • In situ observation of root hair bulge bursting under hypo-osmotic stress.
  • Pharmacological inhibition of NADPH oxidase activity in WT plants.

Main Results:

  • The rhd2/Atrbohc mutant exhibited impaired root epidermal walls and increased root hair bursting compared to WT.
  • Inhibition of NADPH oxidase in WT plants mimicked the mutant phenotype under hypo-osmotic shock.
  • RHD2/AtRBOHC appears to contribute to cell wall softening, facilitating protoplast expansion.

Conclusions:

  • RHD2/AtRBOHC plays a significant role in maintaining plant cell wall strength.
  • NADPH oxidase activity is essential for preventing root hair bursting under osmotic stress.
  • The findings highlight a dual role for NADPH oxidase in contributing to wall strength and enabling cell expansion.