Prevalence of R Genes for Resistance to Potato Viruses in Uganda Germplasm
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Date
2021
Journal Title
Journal ISSN
Volume Title
Publisher
Potato Research
Abstract
The most important potato viruses in Uganda are Potato virus Y (PVY), Potato leaf roll
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.
Description
Keywords
Allele-specific markers, Molecular markers, Potato viruses, R genes, Virus resistant genotypes
Citation
Byarugaba, AA, Mukasa, SB, Barekye, A., & Rubaihayo, PR (2021). Prevalence of R Genes for Resistance to Potato Viruses in Uganda Germplasm. Potato Research , 64 (2), 267-276. https://doi.org/10.1007/s11540-020-09477-7