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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Wise, Arlene A. Banta, Lois M. Nester, Eugene W. Edlind, Merritt P. Kerr, Kathleen Saenkham, Panatda Liu, Pu Yuan, Ze-chun Ronzone, Erik Binns, Andrew N. |
| Description | Author Affiliation: Yuan ZC ( Department of Microbiology, University of Washington, Seattle, WA 98195, USA.); |
| Abstract | Agrobacterium tumefaciens is capable of transferring and integrating an oncogenic T-DNA (transferred DNA) from its tumor-inducing (Ti) plasmid into dicotyledonous plants. This transfer requires that the virulence genes (vir regulon) be induced by plant signals such as acetosyringone in an acidic environment. Salicylic acid (SA) is a key signal molecule in regulating plant defense against pathogens. However, how SA influences Agrobacterium and its interactions with plants is poorly understood. Here we show that SA can directly shut down the expression of the vir regulon. SA specifically inhibited the expression of the Agrobacterium virA/G two-component regulatory system that tightly controls the expression of the vir regulon including the repABC operon on the Ti plasmid. We provide evidence suggesting that SA attenuates the function of the VirA kinase domain. Independent of its effect on the vir regulon, SA up-regulated the attKLM operon, which functions in degrading the bacterial quormone N-acylhomoserine lactone. Plants defective in SA accumulation were more susceptible to Agrobacterium infection, whereas plants overproducing SA were relatively recalcitrant to tumor formation. Our results illustrate that SA, besides its well known function in regulating plant defense, can also interfere directly with several aspects of the Agrobacterium infection process. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 28 |
| Volume Number | 104 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2007-07-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | 4-Butyrolactone Analogs & Derivatives Arabidopsis Microbiology Down-Regulation Genetics Gene Expression Regulation, Plant Physiology Regulon Rhizobium Salicylic Acid Metabolism Signal Transduction Gene Expression Regulation, Bacterial Pathogenicity Pharmacology Virulence Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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