1/4/2024 0 Comments Late blight two![]() ![]() Further genotyping of 20K SNP array confirmed the classification of SSRs and could uncover the genetic relationships of Solanum germplasms. ![]() The genetic differentiation (Fst) ranged from 0.0937 to 0.1764, and the nucleotide diversity (π) was 0.2269 across populations with the range from 0.1942 to 0.2489. Analysis of molecular variance showed 10.08% genetic variation existed among populations. ![]() There was no obvious clustering by country of origin, ploidy level, EBN (endosperm balance number) value, or nuclear clade. Structure analysis discriminated the 189 potato genotypes into five populations based on taxonomic classification and genetic origin with some deviations. A total of 173 alleles were detected with an average of 5.77 alleles per locus. To improve the available gene pool for future potato breeding programs, the population was genotyped using 30 simple sequence repeat (SSR) markers covering the entire potato genome. Ten elite resources with broad-spectrum resistance and 127 with isolate-specific resistance against P. In this study, a diverse population of 189 genotypes with potential late blight resistance, consisting of 20 wild species and cultivated Solanum tuberosum Andigenum group and Chilotanum group, was screened for the presence of late blight resistance by performing challenge inoculation with four Phytophthora infestans isolates including one 13_A2 isolate, CN152. Cultivation of resistant varieties is the most effective and environmentally friendly way to control potato late blight disease, and identification of germplasms with late blight resistance and clarification their genetic relationship would promote the development of the resistant varieties. Late blight, caused by the oomycete Phytophthora infestans, is the most devastating disease in potato-producing regions of the world.
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