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Pseudomonas syringae type III effector AvrRpt2 alters Arabidopsis thaliana auxin physiology
Open accessAbstract
The Pseudomonas syringae type III effector AvrRpt2 promotes bacterial virulence on Arabidopsis thaliana plants lacking a functional RPS2 gene ( rps2 mutant plants). To investigate the mechanisms underlying the virulence activity of AvrRpt2, we examined the phenotypes of transgenic A. thaliana rps2 seedlings constitutively expressing AvrRpt2. These seedlings exhibited phenotypes reminiscent of A. thaliana mutants with altered auxin physiology, including longer primary roots, increased number of lateral roots, and increased sensitivity to exogenous auxin. They also had increased levels of free indole acetic acid (IAA). The presence of AvrRpt2 also was correlated with a further increase in free IAA levels during infection with P. syringae pv. tomato strain DC3000 ( Pst DC3000). These results indicate that AvrRpt2 alters A. thaliana auxin physiology. Application of the auxin analog 1-naphthaleneacetic acid promoted disease symptom development in Pst DC3000-infected plants, suggesting that elevated auxin levels within host tissue promote Pst DC3000 virulence. Thus, AvrRpt2 may be among the virulence factors of P. syringae that modulate host auxin physiology to promote disease.
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Cites
Auxin-responsive gene expression: genes, promoters and regulatory factors
Hagen, G., & Guilfoyle, T. (2002) · Plant Molecular Biology · doi:10.1023/a:1015207114117 · Cited by 1,262
Sites and homeostatic control of auxin biosynthesis in Arabidopsis during vegetative growth
Ljung, K., Bhalerao, R. P., & Sandberg, G. (2001) · The Plant Journal · doi:10.1046/j.1365-313x.2001.01173.x · Cited by 653
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Vlot, A. C., Dempsey, D. A., & Klessig, D. F. (2009) · Annual Review of Phytopathology · doi:10.1146/annurev.phyto.050908.135202 · Cited by 2,568
Role of plant hormones in plant defence responses
Bari, R., & Jones, J. D. G. (2009) · Plant Molecular Biology · doi:10.1007/s11103-008-9435-0 · Cited by 2,565
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Pieterse, C. M. J., Leon-Reyes, A., Van der Ent, S., & Van Wees, S. C. M. (2009) · Nature Chemical Biology · doi:10.1038/nchembio.164 · Cited by 2,327
Xin, X.-F., & He, S. Y. (2013) · Annual Review of Phytopathology · doi:10.1146/annurev-phyto-082712-102321 · Cited by 620
Making Sense of Hormone Crosstalk during Plant Immune Responses
Spoel, S. H., & Dong, X. (2008) · Cell Host & Microbe · doi:10.1016/j.chom.2008.05.009 · Cited by 558
Metadata
- Authors
- Chen, Z., Agnew, J. L., Cohen, J. D., He, P., Shan, L., Sheen, J., & Kunkel, B. N.
- Venue
- Proceedings of the National Academy of Sciences
- Published
- 2007-12-11
- Volume
- 104
- Issue
- 50
- Pages
- 20131-20136
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- OpenAlex
- W2128855891
- Cited by
- 361
- References
- 2
- FWCI
- 25.03
- Type
- journal article
- Language
- en
- Open access
- green
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- Chen, Z., Agnew, J. L., Cohen, J. D., He, P., Shan, L., Sheen, J., & Kunkel, B. N. (2007). Pseudomonas syringae type III effector AvrRpt2 alters Arabidopsis thaliana auxin physiology. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.0704901104
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