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We describe the construction and screening of a large insert genomic library from the diploid potato clone HB171(13) that has been shown to express durable quantitative field resistance to  Phytophthora infestans , the causal agent of potato late blight disease. Integrated genetic mapping of the field resistance quantitative trait locus with markers developed from populations segregating for  Rpi-blb3, Rpi-abpt ,  R2 , and  R2 -like resistance, all located on linkage group IV, has positioned the field resistance QTL within the proximity of this  R  gene cluster. The library has been successfully screened with resistance gene analogues (RGA) potentially linked to the  R  gene cluster. Over 30 positive BAC clones were identified and confirmed by PCR and Southern hybridisations to harbour RGA-like sequences. In addition, BAC end sequencing of positive clones has corroborated two BAC clones with a very high level of nucleotide similarity to the RGA probes utilised.

Generation and Screening of a BAC Library from a Diploid Potato Clone to Unravel Durable Late Blight Resistance on Linkage Group IV