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- Title
Pathogen-Triggered Ethylene Signaling Mediates Systemic-Induced Susceptibility to Herbivory in Arabidopsis.
- Authors
Groen, Simon C.; Whiteman, Noah K.; Bahrami, Adam K.; Wilczek, Amity M.; Cui, Jianping; Russell, Jacob A.; Cibrian-Jaramillo, Angelica; Butler, Ian A.; Rana, Jignasha D.; Huang, Guo-Hua; Bush, Jenifer; Ausubel, Frederick M.; Pierce, Naomi E.
- Abstract
Multicellular eukaryotic organisms are attacked by numerous parasites from diverse phyla, often simultaneously or sequentially. An outstanding question in these interactions is how hosts integrate signals induced by the attack of different parasites. We used a model system comprised of the plant host Arabidopsis thaliana , the hemibiotrophic bacterial phytopathogen Pseudomonas syringae , and herbivorous larvae of the moth Trichoplusia ni (cabbage looper) to characterize mechanisms involved in systemic-induced susceptibility (SIS) to T. ni herbivory caused by prior infection by virulent P. syringae. We uncovered a complex multilayered induction mechanism for SIS to herbivory. In this mechanism, antiherbivore defenses that depend on signaling via (1) the jasmonic acid–isoleucine conjugate (JA -Ile) and (2) other octadecanoids are suppressed by microbe-associated molecular pattern–triggered salicylic acid (SA) signaling and infection-triggered ethylene signaling, respectively. SIS to herbivory is, in turn, counteracted by a combination of the bacterial JA -Ile mimic coronatine and type III virulence-associated effectors. Our results show that SIS to herbivory involves more than antagonistic signaling between SA and JA -Ile and provide insight into the unexpectedly complex mechanisms behind a seemingly simple trade-off in plant defense against multiple enemies.
- Subjects
PSEUDOMONAS syringae; ARABIDOPSIS; ETHYLENE; SALICYLIC acid; HOST plants; ARABIDOPSIS thaliana; KIWIFRUIT; CABBAGE
- Publication
Plant Cell, 2013, Vol 25, Issue 11, p4755
- ISSN
1040-4651
- Publication type
Article
- DOI
10.1105/tpc.113.113415