Genetical studies on resistance to potato viruses X and Y

Cockerham, G.

doi:10.1038/hdy.1970.35

Cited by 292 publications

(185 citation statements)

References 12 publications

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“…Resistance to PVA was also detected in all plants tested of the H98A, H98B and H98D families. Similarly, Rx genes protect potato plants very efficiently against different strains of PVX (Cockerham 1970). Only isolates of PVX strain group 4 are known to overcome Rx (Moreira et al 1980;Tozzini et al 1994;Querci et al 1995) due to a specific mutation in the viral coat protein (Kavanagh et al 1992), and such isolates have been found only twice outside South America (Ross 1986).…”

Section: Discussionmentioning

confidence: 99%

Marker-assisted combination of major genes for pathogen resistance in potato

et al. 2006

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Closely linked PCR-based markers facilitate the tracing and combining of resistance factors that have been introgressed previously into cultivated potato from different sources. Crosses were performed to combine the Ry adg gene for extreme resistance to Potato virus Y (PVY) with the Gro1 gene for resistance to the root cyst nematode Globodera rostochiensis and the Rx1 gene for extreme resistance to Potato virus X (PVX), or with resistance to potato wart (Synchytrium endobioticum). Marker-assisted selection (MAS) using four PCR-based diagnostic assays was applied to 110 F1 hybrids resulting from four 2· by 4· cross-combinations. Thirty tetraploid plants having the appropriate marker combinations were selected and tested for presence of the corresponding resistance traits. All plants tested showed the expected resistant phenotype. Unexpectedly, the plants segregated for additional resistance to pathotypes 1, 2 and 6 of S. endobioticum, which was subsequently shown to be inherited from the PVY resistant parents of the crosses. The selected plants can be used as sources of multiple resistance traits in pedigree breeding and are available from a potato germplasm bank.

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Section: Discussionmentioning

confidence: 99%

Marker-assisted combination of major genes for pathogen resistance in potato

et al. 2006

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“…PVY N does not induce an HR response in potatoes (i.e., Ny tbr or Nc tbr are not induced), whereas PVY N induces vein necrosis in tobacco (Cockerham 1970;Jones 1990;Karasev and Gray 2013;Rowley et al 2015;Singh et al 2008, and reviewed in Funke et al 2017). Similar to PVY N , PVY N-Wi does not induce an HR response in potato and causes vein necrosis in tobacco (Cockerham 1970;Jones 1990;Karasev and Gray 2013;Rowley et al 2015;Singh et al 2008; and reviewed in Funke et al 2017). PVY N-Wi infection of potato plants may be asymptomatic or result in transient mild mosaic patterning on foliage (Karasev and Gray 2013).…”

Section: Introductionmentioning

confidence: 99%

Potato Cultivar and Seed Type Affect the Development of Systemic Potato virus Y (PVYN-Wi) Infection

et al. 2018

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Potato virus Y (PVY) infection is one of the greatest challenges to seed potato production in the United States. To determine how cultivar and seed type affect the development of systemic PVY infection, Russet Burbank and Russet Norkotah Colorado 3 cultivars were grown from two types of pre-nuclear seed (i.e., plantlets and minitubers) and Generation 3 (G3) tubers and challenged with PVY strain Wilga (PVY N-Wi ). Systemic PVY infection was measured by assaying spread of virus from the inoculation site to upper non-inoculated leaves. The Burbank cultivar had a lower incidence of systemic PVY infection compared to the incidence of systemic PVY that developed in the Colorado 3 cultivar. Furthermore, Burbank plants grown from G3 tubers had a lower incidence of systemic PVY infection, as compared to Burbank plants grown from plantlets. Together our results indicate that both cultivar and seed type affect the development of systemic PVY N-Wi infections post-inoculation. ResumenLa infección por virus Y (PVY) es uno de los mayores retos en la producción de semilla de papa en los Estados Unidos. Para determinar cómo afecta la variedad y el tipo de semilla al desarrollo de la infección sistémica de PVY, se cultivaron las variedades Russet Burbank y Russet Norkotah Colorado 3 de dos tipos de semilla pre-nuclear (p. e., plántulas y minitubérculos) y de tubérculos de la Generación 3 (G3), y se inocularon con PVY variante Wilga (PVYN-Wi). La infección sistémica de PVY se midió mediante la detección de la dispersión del virus desde el sitio de inoculación hacia las hojas superiores no inoculadas. La variedad Burbank tuvo la incidencia más baja de infección sistémica de PVYen comparación con la incidencia de PVY sistémico que se desarrolló en la variedad Colorado 3. Aún más, las plantas de Burbank originadas de los tubérculos de G3 tuvieron la incidencia más baja de infección sistémica de PVY, en comparación con las plantas de Burbank originadas de plántulas. Juntos, nuestros resultados indican que tanto la variedad como el tipo de semilla afectan el desarrollo de infecciones sistémicas de PVYN-Wi después de la inoculación.

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“…These genes were identified in Solanum tuberusum ssp. andigena (Ry adg ), on chromosome XI; in S. stoloniferum (Ry sto ), on chromosome XI; and in S. chacoense (Ry chc ), on chromosome IX (Cockerham 1970, Valkonen et al 1994, Tiwari et al 2012). …”

Section: Introductionmentioning

confidence: 99%