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Example sentences for: syringae
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These details are presented in a model of the signaling network for induction of SAR, PR-1 gene expression and PR-5 gene expression by avirulent P. syringae bacteria (Figure 4).
The HR occurs in response to infection with avirulent bacteria at levels of inoculum that cause a large percentage of leaf cells to undergo programmed cell death (PCD) [ 8 ] . In contrast to results with avrRpt2, P. syringae bacteria carrying the avirulence genes avrB , avrRpm1 , avrPphB or avrRps4 elicit an exaggerated HR relative to that on the wild-type Columbia parent [ 5 7 ] . In a study in which bacteria carrying avrB were chosen as a representative member of this class, in further contrast to results with avrRpt2 , these bacteria were capable of eliciting SAR and PR-1 induction on ndr1-1 mutant plants [ 4 ] .
We used the bacterial pathogen Pseudomonas syringae and the oomycete pathogen Peronospora parasitica to evoke the pathogen defense response.
The high levels of inoculum used in the cited study can only be used without causing "false positive" HRs if a bacterial strain that is not a pathogen of Arabidopsis is used to deliver the avr gene product [ 5 7 ] . When sid2 plants were inoculated with 1 × 10 8mL -1of a nonpathogen strain ( P. syringae pv.
The Arabidopsis ndr1-1 mutant showed drastically impaired induction of SAR and PR-1 gene expression in response to infection with Pseudomonas syringae bacteria carrying the avirulence ( avr ) gene avrRpt2 [ 4 ] . This mutant is also incapable of showing a hypersensitive response (HR) to these bacteria [ 5 6 ] except at very high levels of inoculum [ 7 ] . The HR is a macroscopic leaf collapse.
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