Abstract
Exploitation of variability displayed by wild Solanum species for breeding the cultivated potato (S. tuberosum) requires phenotypic and genotypic characterization of germplasm resources. In the present work, a collection of 15 wild Solanum species was investigated for resistance to pathotype Ro2 of the nematode Globodera rostochiensis. Most of the genotypes reduced reproduction of the nematode, compared to the control variety Spunta, a highly resistant genotype being an accession of S. tuberosum spp. andigena. The genetic variability of the Gro1 gene cluster, which confers resistance to some pathotypes of G. rostochiensis, was then studied in the Solanum species used in this study. For this purpose, SCAR markers for eight paralogues of Gro1 gene were developed. No species showed the same pattern of the resistant control genotype. Moreover, wide-genome variability was also assessed by using AFLP markers, which allowed species-specific markers to be identified for each genotype analyzed.
Highlights
The genus Solanum contains more than 2000 species, distributed in very different habitats
Exploitation of variability displayed by wild Solanum species for breeding the cultivated potato (S. tuberosum) requires phenotypic and genotypic characterization of germplasm resources
A collection of 15 wild Solanum species was investigated for resistance to pathotype Ro2 of the nematode Globodera rostochiensis
Summary
The genus Solanum contains more than 2000 species, distributed in very different habitats. More than 200 tuber-bearing species exist that could be important for improving the cultivated potato, Solanum tuberosum L. Wild species are known to be important sources of plant pathogen resistance genes, as well as of many other interesting traits [1] This has been underlined in subsection Potatoe of the Solanum genus, which includes several tuber-bearing wild species already used to improve the cultivated potato [2], for resistance against the variety of pathogens that negatively affect potato production [3]. Molecular fingerprinting of various potato wild species [6,7] and assisted-selection (MAS) [8] allow a better genetic resources managment and a more efficient gene transfer among Solanum species
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