<i>RCY1</i>, an <i>Arabidopsis thaliana RPP8/HRT</i> family resistance gene, conferring resistance to cucumber mosaic virus requires salicylic acid, ethylene and a novel signal transduction mechanism

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<jats:title>Summary</jats:title><jats:p>The dominant locus, <jats:italic>RCY1</jats:italic>, in the <jats:italic>Arabidopsis thaliana</jats:italic> ecotype C24 confers resistance to the yellow strain of cucumber mosaic virus (CMV‐Y). The <jats:italic>RCY1</jats:italic> locus was mapped to a 150‐kb region on chromosome 5. Sequence comparison of this region from C24 and a CMV‐Y‐susceptible C24 mutant predicts that the <jats:italic>RCY1</jats:italic> gene encodes a 104‐kDa CC‐NBS‐LRR‐type protein. The <jats:italic>RCY1</jats:italic> gene from C24, when expressed in the susceptible ecotype Wassilewskija (Ws), restricted the systemic spread of virus. <jats:italic>RCY1</jats:italic> is allelic to the resistance genes <jats:italic>RPP8</jats:italic> from the ecotype Landsberg erecta and <jats:italic>HRT</jats:italic> from the ecotype Dijon‐17, which confer resistance to <jats:italic>Peronospora parasitica</jats:italic> biotype <jats:italic>Emco5</jats:italic> and turnip crinkle virus (TCV), respectively. Examination of <jats:italic>RCY1</jats:italic> plants defective in salicylic acid (SA), jasmonic acid (JA) and ethylene signaling revealed a requirement for SA and ethylene signaling in mounting a resistance response to CMV‐Y. The <jats:italic>RCY1 nahG etr1</jats:italic> double mutants exhibited an intermediate level of susceptibility to CMV‐Y, compared to the resistant ecotype C24 and the susceptible ecotypes Columbia and Nossen. This suggests that in addition to SA and ethylene, a novel signaling mechanism is associated with the induction of resistance in CMV‐Y‐infected C24 plants. Moreover, our results suggest that the signaling pathways downstream of the <jats:italic>RPP8</jats:italic>, <jats:italic>HRT</jats:italic>, and <jats:italic>RCY1</jats:italic> have evolved independently.</jats:p>

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