Evaluation of extreme resistance genes of Potato virus X (Rx1 and Rx2) in different potato genotypes
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Potato (Solanum tuberosum L.) is considered as one of the most important staple foods in the world. Classical breeding for resistance to pests, pathogens and viruses involves the identification of resistance sources, which are often found in different wild potato species. Potato virus X (PVX) attacks potato worldwide, causing considerable amount of yield losses, reaching 20% of productivity depending upon the virus strain. To decrease its impact, there’s serious interest to develop new varieties carrying the Rx1 and/or Rx2 genes which originally came from the wild species Solanum tuberosum ssp. andigena and Solanum acaule, respectively; these genes are able to provide extreme resistance to PVX which could be facilitated with molecular marker-assisted selection. In this study, twenty-five potato genotypes, belong to Potato Research Center, were tested to detect the presence of Rx1 and Rx2 extreme resistance genes of PVX by using 5Rx1 and 106Rx2 specific markers, respectively, to enhance breeding efficiency for the purpose of developing new varieties. The results showed that three genotypes carried the 5Rx1 marker. On the other hand, the results with the 106Rx2 marker showed that thirteen individuals (52%) of the genotypes carried the 106Rx2 marker. Sixteen genotypes (64%) are resistant to PVX and have a great potential for gene introgression, while the other nine genotypes were not carriers of the markers. Genotypes those are carrying the markers were strongly recommending to be used by breeders to develop new PVX extreme resistance potato varieties.
KeywordsPotato virus X (PVX) Extreme resistance Rx1 and Rx2 genes Potato genotypes
This work was funded by the Government of Hungary and FAO together. Authors are grateful for generosity help of Hungarian Government and the FAO to accomplish the study; they also thank the Society of University of Pannonia, Georgikon Faculty for hosting.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interests, and they did not receive any fund for this research.
Human and animal rights
This research did not contain any studies on human and/or animal participants performed by any of the authors.
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