The pathogen will survive in tubers or potentially in tomato fruit that are in a cull pile and can be a source of inoculum the next year. Sanitary practice: Properly dispose of infected tubers by burying them if possible. In addition, the approach developed in this study provides a model for identification of other genes for attractive agronomical traits. Planting resistant varieties: There are potato and tomato varieties that are resistant to late blight, however most are not. SNP and SSR markers linking to this region can be used in marker-assisted selection in future breeding programs for late blight disease, including introgression of new genetic loci from wild species. Among of them, two genes with missense mutations, Solyc06g071810.1 and Solyc06g083640.3, were considered to be potential candidates for disease resistance. Whole-genome resequencing analysis revealed that 298 genes in this region potentially had functional differences between the parental lines. Subsequent association analysis of genotypes and phenotypes of the mapping population revealed that a 6.8 Mb genome region on chromosome 6 was a candidate locus for disease resistance. Using double-digest restriction site-associated DNA sequencing (ddRAD-Seq) technology, we determined 6,514 genome-wide SNP genotypes of an F2 population derived from an interspecific cross. In the genome of a wild relative of tomato, Solanum habrochaites accession LA1777, we identified a new quantitative trait locus for resistance against blight caused by an aggressive Egyptian isolate of P. The diseases it has resistance to differ somewhat from the other hybrids: Verticillium, Fusarium (I1, I2 and I3 genes), late blight, root knot nematodes (Mi), bacterial speck (Pto), TSWV (Sw-5), as well as some early blight tolerance. Wild relatives of tomato possess useful resistance genes against this disease, and could therefore be used in breeding to improve cultivated varieties. Tomato late blight caused by Phytophthora infestans (Mont.) de Bary, also known as the Irish famine pathogen, is one of the most destructive plant diseases.
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