Prevalence of R Genes for Resistance to Potato Viruses in Uganda Germplasm
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Prevalence of R Genes for Resistance to Potato Viruses in Uganda Germplasm Arinaitwe Abel Byarugaba 1,2,3 & Settumba B. Mukasa 1 & Alex Barekye 2 & Patrick R. Rubaihayo 1 Received: 25 March 2020 / Accepted: 4 September 2020/ # European Association for Potato Research 2020
Abstract The most important potato viruses in Uganda are Potato virus Y (PVY), Potato leafroll virus (PLRV), Potato virus X (PVX), Potato virus S (PVS), Potato virus A (PVA) and Potato virus M (PVM). Utilization of R genes in breeding for resistance to viruses has not been explored in Uganda due to limited information on the prevalence of R genes in the available genotypes. This study aimed at identifying potato genotypes with R genes for resistance to potato viruses important in Uganda. The study screened 71 potato accessions from the National Potato Breeding Programme at Kachwekano Zonal Agricultural Research and Development Institute for the presence of resistance genes to viruses using diagnostic molecular markers. The results indicated that 21 out of 71 genotypes had resistance markers, of which nine genotypes, NKRN59.58, Derby, Markies, Sifra, 395017.229, Nakpot 5, 20108.5, Royal and 393220.54, had Ryadg gene for PVY resistance and two genotypes, Kimuri and 319919.3, had Rysto gene for resistance to PVY and PVA. Nine genotypes, 395011.2, Markies, Nakpot 5, 20108.5, Sifra, 20157.6, Royal, 2015.8 and Ambition, had the Nbtbr gene for resistance to PVX. In addition, 14 genotypes, 395011.2, Markies, Nakpot 5, Sarpouna, 393220.54, 391046.14, Sarpomira, 395077.12, Sifra, 20157.6, Royal, Ambition, Kimuri and Caruso, had the Nsadg gene conferring resistance to PVS. Four genotypes, Markies, Sifra, Nakpot 5 and Royal, had the Ryadg, Nbtbr and Nsadg genes for combined resistance to PVY, PVX and PVS. The resistant genotypes could be used as parents to introgress resistance genes into susceptible cultivars. Keywords Allele-specific markers . Molecular markers . Potato viruses . R genes . Virus-
resistant genotypes
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11540-02009477-7) contains supplementary material, which is available to authorized users.
* Arinaitwe Abel Byarugaba [email protected] Extended author information available on the last page of the article
Potato Research
Introduction There are over forty plant viruses worldwide known to infect potato (Zhang et al. 2017). Yield losses due to these viruses range from 10 to 100% (Rao and Reddy 2020). The most important viruses affecting potato in Uganda are Potato virus Y (PVY), Potato leafroll virus (PLRV), Potato virus X (PVX), Potato virus S (PVS), Potato virus A (PVA) and Potato virus M (PVM) (Priegnitz et al. 2019). Most of these viruses are spread through the use of infected seed tubers, by mechanical contact and by aphid vectors in persistent and non-persistent ways (Mackenzie et al. 2016). In Uganda, very little attention has been given to the development and release of cultivars with effective and durable forms of resistance to viru
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