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Mol Plant Pathol. 2011 Sep;12(7):702-8. doi: 10.1111/j.1364-3703.2010.00704.x. Epub 2011 Feb 17.

Physical association of pattern-triggered immunity (PTI) and effector-triggered immunity (ETI) immune receptors in Arabidopsis.

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Department of Plant Biology, Microbial and Plant Genomics Institute, University of Minnesota, St. Paul, MN 55108, USA.


Plants possess two distinct types of immune receptor. The first type, pattern recognition receptors (PRRs), recognizes microbe-associated molecular patterns (MAMPs) and initiates pattern-triggered immunity (PTI) on recognition. FLS2 is a PRR, which recognizes a part of bacterial flagellin. The second type, resistance (R) proteins, recognizes pathogen effectors and initiates effector-triggered immunity (ETI) on recognition. RPM1, RPS2 and RPS5 are R proteins. Here, we provide evidence that FLS2 is physically associated with all three R proteins. Our findings suggest that signalling interactions occur between PTI and ETI at very early stages and/or that FLS2 forms a PTI signalling complex, some components of which are guarded by R proteins.

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