SOS - too many signals for systemic acquired resistance?

Trends Plant Sci. 2012 Sep;17(9):538-45. doi: 10.1016/j.tplants.2012.05.011. Epub 2012 Jun 29.

Abstract

Following pathogen infection, activation of systemic acquired resistance (SAR) in uninfected tissues requires transmission of a signal(s) from the infected tissue via the vasculature. Several candidates for this long-distance signal have been identified, including methyl salicylate (MeSA), an SFD1/GLY1-derived glycerol-3-phosphate (G3P)-dependent signal, the lipid-transfer protein DIR1, the dicarboxylic acid azelaic acid (AzA), the abietane diterpenoid dehydroabietinal (DA), jasmonic acid (JA), and the amino acid-derivative pipecolic acid (Pip). Some of these signals work cooperatively to activate SAR and/or regulate MeSA metabolism. However, Pip appears to activate SAR via an independent pathway that may impinge on these other signaling pathway(s) during de novo salicylic acid (SA) biosynthesis in the systemic tissue. Thus, a complex web of cross-interacting signals appears to activate SAR.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.
  • Review

MeSH terms

  • Disease Resistance
  • Gene Expression Regulation, Plant / physiology
  • Plant Diseases / immunology*
  • Plant Diseases / microbiology
  • Plant Growth Regulators / metabolism
  • Plant Physiological Phenomena*
  • Plant Proteins / physiology*
  • Plants / immunology*
  • Plants / microbiology
  • Signal Transduction / physiology*

Substances

  • Plant Growth Regulators
  • Plant Proteins