Erwinia amylovora Type Three–Secreted Proteins Trigger Cell Death and Defense Responses in Arabidopsis thaliana
Erwinia amylovora is the bacterium responsible for fire blight, a necrotic disease affecting plants of the rosaceous family. E. amylovora pathogenicity requires a functional type three secretion system (T3SS). We show here that E. amylovora triggers a T3SS-dependent cell death on Arabidopsis thalian...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
The American Phytopathological Society
2008-08-01
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| Series: | Molecular Plant-Microbe Interactions |
| Online Access: | https://apsjournals.apsnet.org/doi/10.1094/MPMI-21-8-1076 |
| _version_ | 1819081755048542208 |
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| author | A. Degrave M. Fagard C. Perino M. N. Brisset S. Gaubert S. Laroche O. Patrit M.-A. Barny |
| author_facet | A. Degrave M. Fagard C. Perino M. N. Brisset S. Gaubert S. Laroche O. Patrit M.-A. Barny |
| author_sort | A. Degrave |
| collection | DOAJ |
| description | Erwinia amylovora is the bacterium responsible for fire blight, a necrotic disease affecting plants of the rosaceous family. E. amylovora pathogenicity requires a functional type three secretion system (T3SS). We show here that E. amylovora triggers a T3SS-dependent cell death on Arabidopsis thaliana. The plants respond by inducing T3SS-dependent defense responses, including salicylic acid (SA)-independent callose deposition, activation of the SA defense pathway, reactive oxygen species (ROS) accumulation, and part of the jasmonic acid/ethylene defense pathway. Several of these reactions are similar to what is observed in host plants. We show that the cell death triggered by E. amylovora on A. thaliana could not be simply explained by the recognition of AvrRpt2ea by the resistance gene product RPS2. We then analyzed the role of type three-secreted proteins (T3SPs) DspA/E, HrpN, and HrpW in the induction of cell death and defense reactions in A. thaliana following infection with the corresponding E. amylovora mutant strains. HrpN and DspA/E were found to play an important role in the induction of cell death, activation of defense pathways, and ROS accumulation. None of the T3SPs tested played a major role in the induction of SA-independent callose deposition. The relative importance of T3SPs in A. thaliana is correlated with their relative importance in the disease process on host plants, indicating that A. thaliana can be used as a model to study their role. |
| first_indexed | 2024-12-21T20:05:49Z |
| format | Article |
| id | doaj.art-99abf9e5d7bb439ba15d4fac50bc25cd |
| institution | Directory Open Access Journal |
| issn | 0894-0282 1943-7706 |
| language | English |
| last_indexed | 2024-12-21T20:05:49Z |
| publishDate | 2008-08-01 |
| publisher | The American Phytopathological Society |
| record_format | Article |
| series | Molecular Plant-Microbe Interactions |
| spelling | doaj.art-99abf9e5d7bb439ba15d4fac50bc25cd2022-12-21T18:51:51ZengThe American Phytopathological SocietyMolecular Plant-Microbe Interactions0894-02821943-77062008-08-012181076108610.1094/MPMI-21-8-1076Erwinia amylovora Type Three–Secreted Proteins Trigger Cell Death and Defense Responses in Arabidopsis thalianaA. DegraveM. FagardC. PerinoM. N. BrissetS. GaubertS. LarocheO. PatritM.-A. BarnyErwinia amylovora is the bacterium responsible for fire blight, a necrotic disease affecting plants of the rosaceous family. E. amylovora pathogenicity requires a functional type three secretion system (T3SS). We show here that E. amylovora triggers a T3SS-dependent cell death on Arabidopsis thaliana. The plants respond by inducing T3SS-dependent defense responses, including salicylic acid (SA)-independent callose deposition, activation of the SA defense pathway, reactive oxygen species (ROS) accumulation, and part of the jasmonic acid/ethylene defense pathway. Several of these reactions are similar to what is observed in host plants. We show that the cell death triggered by E. amylovora on A. thaliana could not be simply explained by the recognition of AvrRpt2ea by the resistance gene product RPS2. We then analyzed the role of type three-secreted proteins (T3SPs) DspA/E, HrpN, and HrpW in the induction of cell death and defense reactions in A. thaliana following infection with the corresponding E. amylovora mutant strains. HrpN and DspA/E were found to play an important role in the induction of cell death, activation of defense pathways, and ROS accumulation. None of the T3SPs tested played a major role in the induction of SA-independent callose deposition. The relative importance of T3SPs in A. thaliana is correlated with their relative importance in the disease process on host plants, indicating that A. thaliana can be used as a model to study their role.https://apsjournals.apsnet.org/doi/10.1094/MPMI-21-8-1076 |
| spellingShingle | A. Degrave M. Fagard C. Perino M. N. Brisset S. Gaubert S. Laroche O. Patrit M.-A. Barny Erwinia amylovora Type Three–Secreted Proteins Trigger Cell Death and Defense Responses in Arabidopsis thaliana Molecular Plant-Microbe Interactions |
| title | Erwinia amylovora Type Three–Secreted Proteins Trigger Cell Death and Defense Responses in Arabidopsis thaliana |
| title_full | Erwinia amylovora Type Three–Secreted Proteins Trigger Cell Death and Defense Responses in Arabidopsis thaliana |
| title_fullStr | Erwinia amylovora Type Three–Secreted Proteins Trigger Cell Death and Defense Responses in Arabidopsis thaliana |
| title_full_unstemmed | Erwinia amylovora Type Three–Secreted Proteins Trigger Cell Death and Defense Responses in Arabidopsis thaliana |
| title_short | Erwinia amylovora Type Three–Secreted Proteins Trigger Cell Death and Defense Responses in Arabidopsis thaliana |
| title_sort | erwinia amylovora type three secreted proteins trigger cell death and defense responses in arabidopsis thaliana |
| url | https://apsjournals.apsnet.org/doi/10.1094/MPMI-21-8-1076 |
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