Two linked pairs of Arabidopsis TNL resistance genes independently confer recognition of bacterial effector AvrRps4

SB Saucet, Y Ma, PF Sarris, OJ Furzer, KH Sohn… - Nature …, 2015 - nature.com
Nature communications, 2015nature.com
Plant immunity requires recognition of pathogen effectors by intracellular NB-LRR immune
receptors encoded by Resistance (R) genes. Most R proteins recognize a specific effector,
but some function in pairs that recognize multiple effectors. Arabidopsis thaliana TIR-NB-
LRR proteins RRS1-R and RPS4 together recognize two bacterial effectors, AvrRps4 from
Pseudomonas syringae and PopP2 from Ralstonia solanacearum. However, AvrRps4, but
not PopP2, is recognized in rrs1/rps4 mutants. We reveal an R gene pair that resembles and …
Abstract
Plant immunity requires recognition of pathogen effectors by intracellular NB-LRR immune receptors encoded by Resistance (R) genes. Most R proteins recognize a specific effector, but some function in pairs that recognize multiple effectors. Arabidopsis thaliana TIR-NB-LRR proteins RRS1-R and RPS4 together recognize two bacterial effectors, AvrRps4 from Pseudomonas syringae and PopP2 from Ralstonia solanacearum. However, AvrRps4, but not PopP2, is recognized in rrs1/rps4 mutants. We reveal an R gene pair that resembles and is linked to RRS1/RPS4, designated as RRS1B/RPS4B, which confers recognition of AvrRps4 but not PopP2. Like RRS1/RPS4, RRS1B/RPS4B proteins associate and activate defence genes upon AvrRps4 recognition. Inappropriate combinations (RRS1/RPS4B or RRS1B/RPS4) are non-functional and this specificity is not TIR domain dependent. Distinct putative orthologues of both pairs are maintained in the genomes of Arabidopsis thaliana relatives and are likely derived from a common ancestor pair. Our results provide novel insights into paired R gene function and evolution.
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