Molecules and Cells

, Volume 32, Issue 5, pp 421–429 | Cite as

Arabidopsis TTR1 causes LRR-dependent lethal systemic necrosis, rather than systemic acquired resistance, to Tobacco ringspot virus

  • Moon Nam
  • Serry Koh
  • Sung Uk Kim
  • Leslie L. Domier
  • Jae Heung Jeon
  • Hong Gi Kim
  • Su-Heon Lee
  • Andrew F. Bent
  • Jae Sun MoonEmail author


Most Arabidopsis ecotypes display tolerance to the Tobacco ringspot virus (TRSV), but a subset of Arabidopsis ecotypes, including Estland (Est), develop lethal systemic necrosis (LSN), which differs from the localized hypersensitive responses (HRs) or systemic acquired resistance (SAR) characteristic of incompatible reactions. Neither viral replication nor the systemic movement of TRSV was restricted in tolerant or sensitive Arabidopsis ecotypes; therefore, the LSN phenotype shown in the sensitive ecotypes might not be due to viral accumulation. In the present study, we identified the Est TTR1 gene (tolerance to Tobacco ringspot virus 1) encoding a TIR-NBS-LRR protein that controls the ecotype-dependent tolerant/sensitive phenotypes by a map-based cloning method. The tolerant Col-0 ecotype Arabidopsis transformed with the sensitive Est TTR1 allele developed an LSN phenotype upon TRSV infection, suggesting that the Est TTR1 allele is dominant over the tolerant ttr1 allele of Col-0. Multiple sequence alignments of 10 tolerant ecotypes from those of eight sensitive ecotypes showed that 10 LRR amino acid polymorphisms were consistently distributed across the TTR1/ttr1 alleles. Site-directed mutagenesis of these amino acids in the LRR region revealed that two sites, L956S and K1124Q, completely abolished the LSN phenotype. VIGS study revealed that TTR1 is dependent on SGT1, rather than EDS1. The LSN phenotype by TTR1 was shown to be transferred to Nicotiana benthamiana, demonstrating functional conservation of TTR1 across plant families, which are involved in SGT-dependent defense responses, rather than EDS1-dependent signaling pathways.


Arabidopsis lethal systemic necrosis TIR-NBS-LRR tobacco ringspot virus tolerance to tobacco ringspot virus 1 


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Copyright information

© The Korean Society for Molecular and Cellular Biology and Springer Netherlands 2011

Authors and Affiliations

  • Moon Nam
    • 1
  • Serry Koh
    • 1
  • Sung Uk Kim
    • 1
  • Leslie L. Domier
    • 2
  • Jae Heung Jeon
    • 1
  • Hong Gi Kim
    • 3
  • Su-Heon Lee
    • 4
  • Andrew F. Bent
    • 5
  • Jae Sun Moon
    • 1
    Email author
  1. 1.Green Bio-materials Research CenterKorea Research Institute of Bioscience and BiotechnologyDaejeonKorea
  2. 2.Department of Crop SciencesUSDA-ARS, Soybean/Maize Germplasm, Pathology, and Genetics Research UnitUrbanaUSA
  3. 3.Department of Agricultural BiologyChungnam National UniversityDaejeonKorea
  4. 4.Crop Protection Division, National Academy of Agricultural ScienceRural Development AdministrationSuwonKorea
  5. 5.Department of Plant PathologyUniversity of WisconsinMadisonUSA

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