Root-knot nematodes (RKNs, spp.) can cause severe yield losses in tomatoes. The gene in tomato confers resistance to the species , and , which are prevalent in tomato growing areas. However, this resistance breaks down at high soil temperatures (>28°C). Therefore, it is imperative that new resistance sources are identified and incorporated into commercial breeding programmes. We identified a tomato line, MT12, that does not have but provides resistance to at 32°C soil temperature. An F mapping population was generated by crossing the resistant line with a susceptible line, MT17; the segregation ratio showed that the resistance is conferred by a single dominant gene, designated (). The gene was mapped using 111 Kompetitive Allele Specific PCR (KASP) markers and characterized. Linkage analysis showed that is located on chromosome 6 and flanking markers placed the locus within a 270 kb interval. These newly developed markers can help pyramiding -genes and generating new tomato varieties resistant to RKNs at high soil temperatures.
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| http://dx.doi.org/10.3389/fpls.2023.1267399 | DOI Listing |
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