Signal transduction in systemic acquired resistance

Systemic acquired resistance (SAR) is an important component of plant defense against pathogen infection. Accumulation of salicylic acid (SA) is required for the induction of SAR. However, SA is apparently not the translocated signal but is involved in transducing the signal in target tissues. Inter...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 1995-05, Vol.92 (10), p.4202-4205
Main Authors: Ryals, J. (CIBA-Geigy Corporation, Research Triangle Park, NC.), Lawton, K.A, Delaney, T.P, Friedrich, L, Kessmann, H, Neuenschwander, U, Uknes, S, Vernooij, B, Weymann, K
Format: Article
Language:English
Subjects:
ACIDE SALICYLIQUE
ACIDO SALICILICO
AGENT PATHOGENE
Biochemistry
Disease
Disease resistance
Disease susceptibility
EXPRESION GENICA
EXPRESSION DES GENES
Flowers & plants
GENE
GENES
Infections
Inoculation
Leaves
Lesions
ORGANISMOS PATOGENOS
OXIDORREDUCTASAS
OXYDOREDUCTASE
Pathogens
PEROXIDO DE HIDROGENO
PEROXYDE D'HYDROGENE
PLANTAS
PLANTAS TRANSGENICAS
PLANTE
PLANTE TRANSGENIQUE
Plants
RESISTANCE AUX MALADIES
RESISTENCIA A LA ENFERMEDAD
Rootstocks
Scions
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Summary:Systemic acquired resistance (SAR) is an important component of plant defense against pathogen infection. Accumulation of salicylic acid (SA) is required for the induction of SAR. However, SA is apparently not the translocated signal but is involved in transducing the signal in target tissues. Interestingly, SA accumulation is not required for production and release of the systemic signal. In addition to playing a pivotal role in SAR signal transduction, SA is important in modulating plant susceptibility to pathogen infection and genetic resistance to disease. It has been proposed that SA inhibition of catalase results in H2O2 accumulation and that therefore H2O2 serves as a second messenger in SAR signaling. We find no accumulation of H2O2 in tissues expressing SAR; thus the role of H2O2 in SAR signaling is questionable
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.92.10.4202