Harpin and hydrogen peroxide both initiate programmed cell death but have differential effects on defence gene expression in Arabidopsis suspension cultures

Harpin is a proteinaceous bacterial elicitor secreted by several plant pathogens that we have shown can induce reactive oxygen species generation in Arabidopsis cultures



Scholarcy highlights

  • The oxidative burst exhibited by plant cells in response to pathogen challenge or elicitation has been the subject of much recent research
  • Recent studies have attempted to demonstrate that the hypersensitive response is a form of programmed cell death analogous to apoptosis, a type of PCD in animals characterized by distinct changes in cell morphology and DNA degradation
  • In the present study we have investigated further the role of aHs#sOig#naanlldinhgamrpoinlencuolteos nalffyeicntinthgetihnedeuxcptiroenssioofnceolfl death genes and involved in diverse defence responses, such as those encoding phenylalanine ammonia-lyase, a key enzyme mediating the biosynthesis of phenylpropanoids, lignin and salicylic acid
  • The biological significance of PCD in plants is a topic of considerable interest, not least because of its analogies with certain cell death programmes in animals
  • #.OH#ebrey, Arabidopsis suspension we demonstrate the role roefqHu#irOe#di,notfrtihgegesraimnge a cell death programme
  • Levine et al 18 reported that the expression of glutathione S-transferase, encoding a family of cellular protective enzymes, some of which metabolize lipid peroxides during oxidative stress 44, was induced in asesiolcsicycuibstemeoeardun-lilinasnutdgisuospcneeh.ndaGssiHSoaTn#lOsseob#xyppbrHreeoes#dnsOiuo#dc,nteaisionncndrribteahselspadoot trnirensecehaeittnbomtiltHeyend#ti.hnTiWcAthrhraraielnbsdstiducroocieuppdrtdata that confirm harpin the induction of increased GST

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