Harpin-elicited hypersensitive cell death and pathogen resistance require the NDR1 and EDS1 genes |
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| Authors: | J -L Peng H -S Dong H -P Dong T P Delaney J M Bonasera S V Beer |
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| Institution: | a Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China;b Department of Plant Pathology, Cornell University, Ithaca, NY 14853, USA |
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| Abstract: | Plants sprayed with harpin, a bacterial protein that induces hypersensitive cell death (HCD), develop systemic acquired resistance (SAR) without macroscopic necrosis. HCD sometimes accompanies the development of resistance conferred by resistance (R) genes. In Arabidopsis, some R genes require one or both of the signalling components NDR1 and EDS1 for function. This study addresses whether HCD, NDR1 and EDS1 are required for induction of SAR by harpin. When Arabidopsis and tobacco leaves were sprayed with harpin, microscopic hypersensitive response (micro-HR) lesions developed. Systemic expression of PR genes and the development of resistance were accompanied by micro-HR, except in the ndr1-1 mutant, in which harpin induced micro-HR without the development of resistance or expression of the PR-1 gene. Cell death and resistance did not occur following treatment with harpin in plants that could not accumulate salicylic acid. Harpin also failed to induce resistance in Arabidopsis eds1-1 mutants. Therefore, harpin-induced resistance seems to develop concomitantly with cell death and resistance requires NDR1 and EDS1. |
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| Keywords: | Arabidopsis thaliana Nicotiana tabacum Pseudomonas syringae Peronospora parasitica Tobacco mosaic virus Harpin HCD SAR NDR1 EDS1 |
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