Exploring genetic diversity of tomato (Solanum lycopersicum L.) germplasm of genebank collection employing SSR and SCAR markers
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Α wide selection of tomato (Solanum lycopersicum L.) genotypes with diverse origin and breeding history (14 modern varieties, 71 landraces and 22 commercial hybrids) has been initially genotyped with a selection of highly informative simple sequence repeat (SSR) markers and two SCAR markers originally developed for resistance against two main fungal tomato diseases. Our data revealed a high level of genetic diversity across the selection, with an average number of alleles per locus (NA) equal to 9.6, and the average polymorphism information content (PIC) equal to 0.74. Further, the selected SSRs have been verified as highly polymorphic and able to discriminate different patterns within our collection, amplifying a total of 56 alleles. Cluster analysis indicated that the collection could be grouped into three clades, with most of landraces and modern varieties being clearly distinguished from hybrids, but also with each other. Breeding involve the selection of specific phenotypes, limiting the genetic variation of the population. Herein, a notable genetic loss due to breeding was detected in the modern tomato gene pool.
KeywordsLandraces SCAR marker Loss of diversity SSR markers Modern varieties
This project was funded in part through AgroETAK to EDG (No. 3497/146) administered by HAO—DEMETER (responsible scientist, AGD) under the “Research, Technological Development & Innovation Projects”—in the framework of the Operational Program “Human Resources Development” MIS 453350. This was in turn co-financed by the European Union Social Fund and by Greece through the National Strategic Reference Framework (ESPA, Research Funding Program 2007–2013). This work was supported by Chiang Mai University.
Compliance with ethical standards
Conflict of interest
The authors declare no conflicts of interest.
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