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Mapping of a novel, major late blight resistance locus in the diploid (1 EBN ) Mexican Solanum pinnatisectum Dunal on chromosome VII
Author(s) -
Nachtigall Marion,
König Janine,
Thieme Ramona
Publication year - 2018
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/pbr.12580
Subject(s) - biology , phytophthora infestans , locus (genetics) , blight , oomycete , genetics , population , marker assisted selection , gene mapping , genetic marker , gene , ploidy , genetic linkage , doubled haploidy , quantitative trait locus , intraspecific competition , botany , chromosome , demography , sociology , ecology
Abstract Late blight caused by the oomycete Phytophthora infestans (Mont.) de Bary ( Pi ) is the most important foliar disease of potato worldwide. An intraspecific hybrid between individuals of a resistant and a susceptible S. pinnatisectum accession was backcrossed to the susceptible parent to generate a segregating population for late blight resistance consisting of 84 plants. In detached‐leaflet assays, reaction to late blight segregated in a 1r:1s manner in BC 1 progeny indicating the presence of a single dominant resistance gene. A genetic map was constructed based on 1,583 DA rT/ SSR markers which were allocated to 12 linkage groups, covering 1,793.5 cM with an average marker distance of 1.1 cM . The late blight resistance locus derived from S. pinnatisectum was mapped on chromosome VII . In comparison with the previously reported resistance genes Rpi1 and Rpi2 , the new target resistance locus most likely is located on the opposite arm of chromosome VII . Results of this study will serve as a basis for future fine mapping of the late blight resistance locus and the development of locus‐specific markers for marker‐assisted selection.