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

Hideki Takahashi, Jennifer Miller, Yukine Nozaki, Sukamto, Megumi Takeda, Jyoti Shah, Shu Hase, Masato Ikegami, Yoshio Ehara, S. P. Dinesh-Kumar

Research output: Contribution to journalArticlepeer-review

165 Citations (Scopus)

Abstract

The dominant locus, RCY1, in the Arabidopsis thaliana ecotype C24 confers resistance to the yellow strain of cucumber mosaic virus (CMV-Y). The RCY1 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 RCY1 gene encodes a 104-kDa CC-NBS-LRR-type protein. The RCY1 gene from C24, when expressed in the susceptible ecotype Wassilewskija (Ws), restricted the systemic spread of virus. RCY1 is allelic to the resistance genes RPP8 from the ecotype Landsberg erecta and HRT from the ecotype Dijon-17, which confer resistance to Peronospora parasitica biotype Emco5 and turnip crinkle virus (TCV), respectively. Examination of RCY1 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 RCY1 nahG etr1 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 RPP8, HRT, and RCY1 have evolved independently.

Original languageEnglish
Pages (from-to)655-667
Number of pages13
JournalPlant Journal
Volume32
Issue number5
DOIs
Publication statusPublished - 2002 Dec

Keywords

  • CC-NBS-LRR protein
  • Cucumber mosaic virus
  • Salicylic acid
  • Signal transduction
  • Virus resistance

ASJC Scopus subject areas

  • Genetics
  • Plant Science
  • Cell Biology

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