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A β-glucuronidase (GUS) Based Cell Death Assay
07:35

A β-glucuronidase (GUS) Based Cell Death Assay

Published on: May 6, 2011

Catalase and alternative oxidase cooperatively regulate programmed cell death induced by beta-glucan elicitor in

Masashi Mizuno1, Yasuomi Tada, Kimitaka Uchii

  • 1Faculty of Agriculture, Kobe University, Nada-ku, Kobe 657-8501, Japan. mizuno@kobe-u.ac.jp

Planta
|October 14, 2004
PubMed

Insights

Potato cells treated with beta-glucan elicitor showed increased alternative oxidase (AOX) and hydrogen peroxide (H2O2). Catalase, alongside AOX, is crucial in preventing mitochondrial breakdown and programmed cell death (PCD).

Area of Science:

  • Plant molecular biology
  • Biochemistry
  • Cellular stress responses

Background:

  • Beta-glucan elicitors trigger defense responses in potato (Solanum tuberosum L.) cells.
  • Alternative oxidase (AOX) and hydrogen peroxide (H2O2) are implicated in plant stress signaling.

Purpose of the Study:

  • To investigate the roles of alternative oxidase (AOX) and catalase in beta-glucan-induced programmed cell death (PCD) in potato cells.
  • To elucidate the involvement of H2O2 accumulation and mitochondrial membrane potential (deltapsi(m)) in these processes.

Main Methods:

  • Potato suspension cells were treated with beta-glucan elicitor.
  • Enzyme activities of catalase and ascorbate peroxidase were inhibited.
  • AOX gene expression and H2O2 levels were measured.
  • Mitochondrial membrane potential (deltapsi(m)) and PCD were assessed.

Main Results:

  • Beta-glucan treatment induced AOX expression and H2O2 accumulation.
  • Catalase inhibition enhanced AOX mRNA and H2O2 production, while ascorbate peroxidase inhibition had no effect.
  • Simultaneous inhibition of catalase and AOX led to significant H2O2 increase, mitochondrial dysfunction, and PCD.

Conclusions:

  • Catalase plays a critical role, alongside AOX, in suppressing beta-glucan-induced mitochondrial deltapsi(m) breakdown and PCD in potato cells.
  • This study highlights a novel regulatory mechanism involving catalase in plant defense signaling and cell death pathways.

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