Report of the Tomato Genetics Cooperative Number 58

RESEARCH REPORTS TGC REPORT 58, 2008
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Of particular interest was the relationship of this SCAR marker (P7-43DF3/R1) to the location of
the I-3 gene. Dr. David Jones (Hemming et al., 2004; Lim et al., 2006) was provided with the
sequence of the introgression from NC123S before it was available at GenBank, as his research
team had published a simplified diagram of the I-3-introgression region (see Fig. 3, Lim et al., 2006).
His response was as follows: ―The P7-43DF3/R1 SCAR marker is outside of the BAC contig covering
I-3, which Dr. David Jones and his research team at The Australian National University, Canberra has
developed, but is estimated to be less than 1 cM from I-3‖ (David Jones, pers. com.). Thus, our
evaluations of this SCAR marker with various inbreds and hybrids along with the information from Dr.
Jones indicate that this marker, P7-43DF3/R1, is linked to the I-3 introgression, and can be used as a
co-dominant SCAR marker for selection of inbreds with FOL race 3 resistance in tomato breeding
programs.
Acknowledgements: This project was funded in part by San Carlos University of Guatemala, by the
National Council for Science and Technology of Guatemala (FODECYT 54-07) grant to L. Mejía, by
the USAID-MERC (GEG—G-00-02-00003-00) grant to D. P. Maxwell, and by the College of
Agricultural and Life Sciences, University of Wisconsin-Madison. Authors express appreciation to J.
W. Scott, R. Gardner, and H. Czosnek and to the commercial companies, Harris Moran and
GenTropic Seeds, for providing germplasm.
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