Induction of H2O2 in transgenic rice leads to cell death and enhanced resistance to both bacterial and fungal pathogens

Aardra Kachroo, Zuhua He, Rajesh Patkar, Qun Zhu, Jingping Zhong, Debao Li, Pamela Ronald, Chris Lamb, Bharat B. Chattoo

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

Oxidative burst, mediated by hydrogen peroxide (H2C 2), has been recognized as a key component of plant defense response during an incompatible interaction. To determine if elevated levels of H 2O2 lead to cell death, activation of defense genes and enhanced resistance to diverse pathogens, transgenic rice plants expressing a fungal glucose oxidase gene (GOX) were generated using both constitutive and inducible expression systems. Constitutive or wound/pathogen-induced expression of GOX also allowed us to determine the effectiveness of these systems in conferring long lasting resistance to various pathogens. Both constitutive and wound/pathogen-induced expression of GOX lead to increases in the endogenous levels of H2O2, which in turn caused cell death. Elevated levels of H2O2 also activated the expression of several defense genes and these transgenic plants showed enhanced resistance to both bacterial and fungal pathogens. In comparison to inducible expression, constitutive expression of GOX resulted in 3-10-fold higher levels of the GOX transcript and the corresponding enzymatic activity. Such increased levels of GOX, which would result in elevated levels of H2O2, caused improper seed set and decreased seed viability in transgenic plants constitutively expressing GOX. Our results suggest that pathogen inducible expression of heterologous genes may be a practical and robust way of generating broad spectrum disease resistance.

Original languageEnglish
Pages (from-to)577-586
Number of pages10
JournalTransgenic Research
Volume12
Issue number5
DOIs
StatePublished - Oct 2003

Bibliographical note

Funding Information:
We thank Tsegaye Dabi for technical assistance, and Drs Shiping Zhang and Lili Chen for providing facilities for rice transformation. We also thank Dr Robert Dudler for providing the rice probes PIR2 and PIR3, and Dr John Markwell for providing the GOX antibody. The project was funded by the Rockefeller Foundation.

Keywords

  • Cell death
  • Enhanced resistance
  • Glucose oxidase
  • Hydrogen peroxide
  • Transgenic rice

ASJC Scopus subject areas

  • Biotechnology
  • Animal Science and Zoology
  • Agronomy and Crop Science
  • Genetics

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