Digitale Medien
Palo Alto, Calif.
:
Annual Reviews
Annual Review of Plant Physiology and Plant Molecular Biology
48 (1997), S. 251-275
ISSN:
1040-2519
Quelle:
Annual Reviews Electronic Back Volume Collection 1932-2001ff
Thema:
Biologie
Notizen:
Abstract Rapid generation of superoxide and accumulation of H2O2 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 H2O2 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.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1146/annurev.arplant.48.1.251
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