Journal
MOLECULAR PLANT-MICROBE INTERACTIONS
Volume 18, Issue 7, Pages 722-729Publisher
AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/MPMI-18-0722
Keywords
BAC library; bulked segregant analysis; chromosome walking; synteny
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Late blight, caused by Phytophthora infestans, is one of the most devastating diseases in cultivated potato. Breeding of new potato cultivars with high levels of resistance to P infestans is considered the most durable strategy for future potato cultivation. In this study, we report the identiflcation of a new late-blight resistance (R) locus from the wild potato species Solanum bulbocastanum. Using several different approaches, a high-resolution genetic map of the new locus was generated, delimiting Rpi-blb3 to a 0.93 cM interval on chromosome 4. One amplification fragment length polymorphism marker was identified that cosegregated in 1,396 progeny plants of an intraspecific mapping population with Rpi-blb3. For comparative genomics purposes, markers linked to Rpi-blb3 were tested in mapping populations used to map the three other late-blight R loci Rpi-abpt, R2, and R2-like also to chromosome 4. Marker order and allelic conservation suggest that Rpi-blb3, Rpi-abpt, R2, and R2-like reside in the same R gene cluster on chromosome 4 and likely belong to the same gene family. Our findings provide novel insights in the evolution of R gene clusters conferring late-blight resistance in Solanum spp.
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