Novel effector recognition capacity engineered into a paired NLR complex
Wang, S.; Huang, W.; Duxbury, Z.; Hogenhout, S. A.; Jones, J. D.
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The Arabidopsis RRS1-R Resistance gene confers recognition of the bacterial acetyltransferase PopP2 and another bacterial effector, AvrRps4. The RRS1-S allele recognizes AvrRps4 but not PopP2. RRS1- R/RRS1-S heterozygotes cannot recognize PopP2. RRS1-R and RRS1-S also suppress the constitutive RPS4-dependent autoactivity of RRS1-Rslh1. Phytoplasmas cause important plant diseases, and their effectors can cause degradation of specific host proteins. We tested whether attaching a pathogen effector-dependent degron to RRS1-R, enabling its degradation by phytoplasma effector SAP05, could derepress RRS1-Rslh1 autoactivity, resulting in SAP05-dependent resistance. In transient assays in tobacco, RRS1-R-derived constructs can confer a hypersensitive response (HR) to SAP05. However, phytoplasma infection assays in transgenic Arabidopsis resulted in delayed disease symptoms but not full resistance. We provide a proof-of-concept strategy utilizing the recessiveness of a plant immune receptor gene to engineer recognition of a pathogen effector that promotes degradation of a specific host protein.
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