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. 1995 May 9;92(10):4202–4205. doi: 10.1073/pnas.92.10.4202

Signal transduction in systemic acquired resistance.

J Ryals 1, K A Lawton 1, T P Delaney 1, L Friedrich 1, H Kessmann 1, U Neuenschwander 1, S Uknes 1, B Vernooij 1, K Weymann 1
PMCID: PMC41911  PMID: 11607545

Abstract

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.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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