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Construction of a yeast artificial chromosome library of tomato and identification of cloned segments linked to two disease resistance loci

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Summary

We have constructed a yeast artificial chromosome (YAC) library of tomato for chromosome walking that contains the equivalent of three haploid genomes (22 000 clones). The source of high molecular weight DNA was leaf protoplasts from the tomato cultivars VFNT cherry and Rio Grande-PtoR, which together contain loci encoding resistance to six pathogens of tomato. Approximately 11 000 YACs have been screened with RFLP markers that cosegregate withTm-2a andPto — loci conferring resistance to tobacco mosaic virus andPseudomonas syringae pv.tomato, respectively. Five YACs were identified that hybridized to the markers and are therefore starting points for chromosome walks to these genes. A subset of the library was characterized for the presence of various repetitive sequences and YACs were identified that carried TGRI, a repeat clustered near the telomeres of most tomato chromosomes, TGRII, an interspersed repeat, and TGRIIl, a repeat that occurs primarily at centromeric sites. Evaluation of the library for organellar sequences revealed that approximately 10% of the clones contain chloroplast sequences. Many of these YAC clones appear to contain the entire 155 kb tomato chloroplast genome. The tomato cultivars used in the library construction, in addition to carrying various disease resistance genes, also contain the wild-type alleles corresponding to most recessive mutations that have been mapped by classical linkage analysis. Thus, in addition to its utility for physical mapping and genome studies, this library should be useful for chromosome walking to genes corresponding to virtually any phenotype that can be scored in a segregating population.

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Communicated by D.M. Lonsdale

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Martin, G.B., Ganal, M.W. & Tanksley, S.D. Construction of a yeast artificial chromosome library of tomato and identification of cloned segments linked to two disease resistance loci. Molec. Gen. Genet. 233, 25–32 (1992). https://doi.org/10.1007/BF00587557

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