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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Chung, Seung Ho Peiffer, Michelle Tooker, John F. Scully, Erin D. Hoover, Kelli Felton, Gary W. Rosa, Cristina Luthe, Dawn S. |
| Description | Author Affiliation: Chung SH ( Departments of Entomology and Plant Science, Center for Chemical Ecology, and Intercollege Program in Genetics, Huck Institutes of the Life Sciences, Pennsylvania State University, University Park, PA 16802.); |
| Abstract | Induced plant defenses in response to herbivore attack are modulated by cross-talk between jasmonic acid (JA)- and salicylic acid (SA)-signaling pathways. Oral secretions from some insect herbivores contain effectors that overcome these antiherbivore defenses. Herbivores possess diverse microbes in their digestive systems and these microbial symbionts can modify plant-insect interactions; however, the specific role of herbivore-associated microbes in manipulating plant defenses remains unclear. Here, we demonstrate that Colorado potato beetle (Leptinotarsa decemlineata) larvae exploit bacteria in their oral secretions to suppress antiherbivore defenses in tomato (Solanum lycopersicum). We found that antibiotic-untreated larvae decreased production of JA and JA-responsive antiherbivore defenses, but increased SA accumulation and SA-responsive gene expression. Beetles benefit from down-regulating plant defenses by exhibiting enhanced larval growth. In SA-deficient plants, suppression was not observed, indicating that suppression of JA-regulated defenses depends on the SA-signaling pathway. Applying bacteria isolated from larval oral secretions to wounded plants confirmed that three microbial symbionts belonging to the genera Stenotrophomonas, Pseudomonas, and Enterobacter are responsible for defense suppression. Additionally, reinoculation of these bacteria to antibiotic-treated larvae restored their ability to suppress defenses. Flagellin isolated from Pseudomonas sp. was associated with defense suppression. Our findings show that the herbivore exploits symbiotic bacteria as a decoy to deceive plants into incorrectly perceiving the threat as microbial. By interfering with the normal perception of herbivory, beetles can evade antiherbivore defenses of its host. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 39 |
| Volume Number | 110 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2013-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Bacteria Immunology Beetles Microbiology Herbivory Physiology Lycopersicon Esculentum Mouth Plant Immunity Animals Anti-Bacterial Agents Pharmacology Drug Effects Ultrastructure Catechol Oxidase Metabolism Cyclopentanes Flagellin Gene Expression Regulation, Plant Larva Growth & Development Genetics Molecular Sequence Data Oxylipins Salicylic Acid Signal Transduction Symbiosis Research Support, U.S. Gov't, Non-P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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