Harpin induces disease resistance in Arabidopsis through the systemic acquired resistance pathway mediated by salicylic acid and the NIM1 gene.
Harpin, the product of the hrpN gene of Erwinia amylovora, elicits the hypersensitive response and disease resistance in many plants. Harpin and known inducers of systemic acquired resistance (SAR) were tested on five genotypes of Arabidopsis thaliana to assess the role of SAR in harpin-induced resistance. In wild-type plants, harpin elicited systemic resistance to Peronospora parasitica and Pseudomonas syringae pv. tomato, accompanied by induction of the SAR genes PR-1 and PR-2. However, in experiments with transgenic Arabidopsis plants containing the nahG gene which prevents accumulation of salicylic acid (SA), harpin neither elicited resistance nor activated SAR gene expression. Harpin also failed to activate SAR when applied to nim1 (non-inducible immunity) mutants, which are defective in responding to SA and regulation of SAR. In contrast, mutants compromised in responsiveness to methyl jasmonate and ethylene developed the same resistance as did wild-type plants. Thus, harpin elicits disease resistance through the NIM1-mediated SAR signal transduction pathway in an SA-dependent fashion. The site of action of harpin in the SAR regulatory pathway is upstream of SA.
Dong
H
H
Department of Plant Pathology, Cornell University, Ithaca, NY 14853-4203, USA.
Delaney
T P
TP
Bauer
D W
DW
Beer
S V
SV
D000085:Acetates / Q000378:metabolism; D000900:Anti-Bacterial Agents / Q000378:metabolism; D017360:Arabidopsis / Q000235:genetics* / Q000276:immunology / Q000378:metabolism / Q000382:microbiology; D001425:Bacterial Outer Membrane Proteins / Q000378:metabolism*; D003517:Cyclopentanes / Q000378:metabolism; D005030:Ethylenes / Q000378:metabolism; D009154:Mutation; D009868:Oomycetes; D054883:Oxylipins; D010935:Plant Diseases / Q000235:genetics*; D010940:Plant Proteins / Q000096:biosynthesis; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism*; D011505:Protein-Tyrosine Kinases / Q000378:metabolism*; D011549:Pseudomonas; D020156:Salicylic Acid / Q000378:metabolism; D029702:Schizosaccharomyces pombe Proteins
D000085:Acetates; D000900:Anti-Bacterial Agents; D001425:Bacterial Outer Membrane Proteins; D003517:Cyclopentanes; D005030:Ethylenes; D054883:Oxylipins; D010940:Plant Proteins; D029702:Schizosaccharomyces pombe Proteins; C075462:harpin protein, Erwinia amylovora; C053376:pathogenesis-related proteins, plant; C087295:HrpZ protein, Pseudomonas syringae; C072239:methyl jasmonate; C036216:ethylene; C080364:cdr1 protein, S pombe; D011505:Protein-Tyrosine Kinases; D017346:Protein Serine-Threonine Kinases; D020156:Salicylic Acid