Molecular Breeding

, Volume 20, Issue 3, pp 271–284 | Cite as

Ty-3, a begomovirus resistance locus near the Tomato yellow leaf curl virus resistance locus Ty-1 on chromosome 6 of tomato

  • Yuanfu Ji
  • David J. Schuster
  • Jay W. ScottEmail author
Original Paper


Resistance to begomoviruses including bipartite Tomato mottle virus (ToMoV) and monopartite Tomato yellow leaf curl virus (TYLCV) has been introgressed to cultivated tomato (Solanum lycopersicum) from S. chilense accessions LA1932, LA2779, and LA1938. Previous research demonstrated that three regions on chromosome 6 were associated with the resistance, two of which were required for a line to provide a high level of resistance. In the present study, we identified a large S. chilense introgression spanning markers from C2_At2g39690 to T0834 in LA2779-derived advanced breeding lines resistant to both TYLCV and ToMoV. A begomovirus resistance locus, Ty-3, was mapped to the marker interval between cLEG-31-P16 and T1079 on the long arm of chromosome 6. In addition to the Ty-3 locus, the large introgression also spans the Ty-1 region near the Mi gene, suggesting the possible coexistence and linkage of resistance alleles at both Ty-1 and Ty-3 loci in these lines. In contrast, LA1932-derived advanced breeding lines possess a much shorter introgression from cLEG-31-P16 to C2_At5g41480, which also carries a begomovirus resistance locus that is probably allelic at the Ty-3 locus. The PCR-based markers tightly linked to the Ty-3 locus as well as the markers near the Ty-1 region have been used in our breeding program for efficient selection of begomovirus resistance in the past three growing seasons and will be useful resources for tomato breeders around the world.


Disease resistance Lycopersicon esculentum Solanum chilense Tomato mottle virus Tomato yellow leaf curl virus 



The authors are grateful to Jose Diaz, Cathy Provenzano, and Rosa Ayala for technical assistance and maintaining plants; to Christopher T. Martin and Douglas P. Maxwell for sharing their sequence data and creative insights relevant to the current research; and to crew members in David J. Schuster’s lab for assistance in virus inoculation. Craig K. Chandler and Zhanao Deng provided constructive comments on the manuscript. This research was supported in part by grants from Unilever Bestfoods Ltd. and the Florida Tomato Committee.


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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.Gulf Coast Research and Education CenterUniversity of FloridaWimaumaUSA

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