1932

Abstract

Rapid generation of superoxide and accumulation of HO is a characteristic early feature of the hypersensitive response following perception of pathogen avirulence signals. Emerging data indicate that the oxidative burst reflects activation of a membrane-bound NADPH oxidase closely resembling that operating in activated neutrophils. The oxidants are not only direct protective agents, but HO also functions as a substrate for oxidative cross-linking in the cell wall, as a threshold trigger for hypersensitive cell death, and as a diffusible signal for induction of cellular protectant genes in surrounding cells. Activation of the oxidative burst is a central component of a highly amplified and integrated signal system, also involving salicylic acid and perturbations of cytosolic Ca2+, which underlies the expression of disease-resistance mechanisms.

Keyword(s): cell deathH2O2superoxide
Loading

Article metrics loading...

/content/journals/10.1146/annurev.arplant.48.1.251
1997-06-01
2024-03-29
Loading full text...

Full text loading...

/content/journals/10.1146/annurev.arplant.48.1.251
Loading
/content/journals/10.1146/annurev.arplant.48.1.251
Loading

Data & Media loading...

  • Article Type: Review Article
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error