Acknowledgements This research was supported by the CICYT, project AGL2002-03329. M. García-Gusano is a fellow  of  the  Ministerio  de  Ciencia  y  Tecnología  of  Spain.  S.  García-Martínez  is  a  fellow  of  the Ministerio de Educación, Cultura y Deporte of Spain. We thank also TGRC and S.D Tanksley for providing seeds of Rio Grande and TA496, respectively, and to Paul Arens for providing seeds of Vision and Evita. Literature cited   Baldo, A.M., Labate, J., and L.D. Robertson. (2004). A search for molecular diversity in tomato. p. 147. In Final Abstracts Guide, Plant and Animal Genome XII, San Diego, CA. Bhattramakki, D., Dolan M., Hanafey, M., Wineland, R., Vaske, D., Register, J.C., Tingey S.V., and A.  Rafalski.  (2002).  Insertion-deletion  polymorphisms  in  3’  regions  of  maize  genes  occur frequently and can be used as highly informative genetic markers. Plant Molecular Biology (5-6):539-547. Bredemeijer, G.M., Arens, P., Wouters, D., Visser, D., and B. Vosman. (1998). The use of semi- automated  fluorescent  microsatellite  analysis  for  tomato  cultivar  identification.  Theor.  Appl. Genet. 97:584-590. Cregan, P.B., Zhu, Y., and Q. Song. (2002). SNP detection and mapping in soybean and related glycine species. Plant, Animal & Microbe Genomes X Conference. San Diego, CA.   Morales,   N.,   Roig,   E.,   Monforte,   A.J.,   Arús,   P.,   and   J.   Garcia-Mas.   2004.   Single-nucleotide polymorphisms detected in expressed sequence tags of melon (Cucumis melo L.). Genome 47(2):352-360. Rafalski,  A.  (2002).  Applications  of  single  nucleotide  polymorphisms  in  crop  genetics.  Current Opinion in Plant Biology 5:94-100. Ruiz,  J.J.,  García-Martínez,  S.,  Picó,  B.,  Gao,  M.,  and  C.F.  Quiros.  Genetic  variability  and relationship  of  closely  related  Spanish  traditional  cultivars  of  tomato  as  detected  by  SRAP and SSR markers. Journal of the American Society for Horticultural Science (in press). Yang, W., Bai, X., Eaton, C., Kamoun, S., Van der Knaap, E., and D. Francis. (2003). Discovery, mapping,  and  application  of  single  nucleotide  polymorphisms  in  Lycopersicon  esculentum. Plant & Animal Genomes XI Conference. San Diego, CA.

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