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Mol Ecol

Title:		Rhizosphere-associated Pseudomonas induce systemic resistance to herbivores at the cost of susceptibility to bacterial pathogens
Author(s):		Haney CH; Wiesmann CL; Shapiro LR; Melnyk RA; O'Sullivan LR; Khorasani S; Xiao L; Han J; Bush J; Carrillo J; Pierce NE; Ausubel FM;
Address:		"Department of Microbiology and Immunology, The University of British Columbia, Vancouver, BC, Canada. Michael Smith Laboratories, The University of British Columbia, Vancouver, BC, Canada. Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, USA. Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA, USA. Department of Applied Ecology, North Carolina State University, Raleigh, NC, USA. Department of Molecular Biology, Massachusetts General Hospital, Boston, MA, USA. Land and Food Systems, The University of British Columbia, Vancouver, BC, Canada. Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China. Department of Genetics, Harvard Medical School, Boston, MA, USA"
Journal Title:		Mol Ecol
Year:		2018
Volume:		20171123
Issue:		8
Page Number:		1833 - 1847
DOI:		10.1111/mec.14400
ISSN/ISBN:		1365-294X (Electronic) 0962-1083 (Linking)
Abstract:		"Plant-associated soil microbes are important mediators of plant defence responses to diverse above-ground pathogen and insect challengers. For example, closely related strains of beneficial rhizosphere Pseudomonas spp. can induce systemic resistance (ISR), systemic susceptibility (ISS) or neither against the bacterial foliar pathogen Pseudomonas syringae pv. tomato DC3000 (Pto DC3000). Using a model system composed of root-associated Pseudomonas spp. strains, the foliar pathogen Pto DC3000 and the herbivore Trichoplusia ni (cabbage looper), we found that rhizosphere-associated Pseudomonas spp. that induce either ISS and ISR against Pto DC3000 all increased resistance to herbivory by T. ni. We found that resistance to T. ni and resistance to Pto DC3000 are quantitative metrics of the jasmonic acid (JA)/salicylic acid (SA) trade-off and distinct strains of rhizosphere-associated Pseudomonas spp. have distinct effects on the JA/SA trade-off. Using genetic analysis and transcriptional profiling, we provide evidence that treatment of Arabidopsis with Pseudomonas sp. CH267, which induces ISS against bacterial pathogens, tips the JA/SA trade-off towards JA-dependent defences against herbivores at the cost of a subset of SA-mediated defences against bacterial pathogens. In contrast, treatment of Arabidopsis with the ISR strain Pseudomonas sp. WCS417 disrupts JA/SA antagonism and simultaneously primes plants for both JA- and SA-mediated defences. Our findings show that ISS against the bacterial foliar pathogens triggered by Pseudomonas sp. CH267, which is a seemingly deleterious phenotype, may in fact be an adaptive consequence of increased resistance to herbivory. Our work shows that pleiotropic effects of microbiome modulation of plant defences are important to consider when using microbes to modify plant traits in agriculture"
Keywords:		"Arabidopsis/*genetics/microbiology Brassicaceae/*genetics/microbiology Cyclopentanes/metabolism Gene Expression Regulation, Plant Herbivory/genetics Solanum lycopersicum/genetics/microbiology Oxylipins/metabolism Plant Diseases/*genetics/microbiology Plan;"
Notes:		"MedlineHaney, Cara H Wiesmann, Christina L Shapiro, Lori R Melnyk, Ryan A O'Sullivan, Lucy R Khorasani, Sophie Xiao, Li Han, Jiatong Bush, Jenifer Carrillo, Juli Pierce, Naomi E Ausubel, Frederick M eng R37 GM048707/GM/NIGMS NIH HHS/ Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. England 2017/11/01 Mol Ecol. 2018 Apr; 27(8):1833-1847. doi: 10.1111/mec.14400. Epub 2017 Nov 23"