Abstract
Potato virus Y (PVY) impacts potato production worldwide by reducing potato yield, tuber quality, and successful certification of seed. Extreme resistance to PVY is conferred by three genes (Ryadg, Rysto, and Rychc) which have been introgressed from wild species into cultivated varieties. Both Rysto and Ryadg are used in many breeding programs worldwide, but Rychc is found in only a limited number of varieties and previously had been absent in varieties and germplasm representative of the russet market class that is widely grown in North America. Five russet breeding clones were identified as having the molecular marker associated with Rychc. Confirmation of the presence of Rychc was established following field and greenhouse screening of the clones for resistance to PVY with no infection by the virus being observed. These clones also have been characterized as having resistance to late blight and cold-induced sweetening of tubers and all are male-fertile as well. The unique assemblage of resistances in this russet germplasm will be of value to the potato breeding community in the development of russet potato varieties, especially with respect to Rychc which previously has not been reported as being present in this potato market class.
Resumen
El virus Y de la papa (PVY) impacta la producción de papa en todo el mundo al reducir el rendimiento de la papa, la calidad del tubérculo y la certificación exitosa de la semilla. La resistencia extrema al PVY es conferida por tres genes (Ry adg, Ry sto y Ry chc) que han sido incorporados de especies silvestres a variedades cultivadas. Tanto Ry sto como Ry adg se utilizan en muchos programas de mejoramiento en el mundo, pero Ry chc se encuentra solo en un número limitado de variedades y anteriormente había estado ausente en variedades y germoplasma representativos de la clase de mercado tipo russet que se cultiva ampliamente en América del Norte. Se identificaron cinco clones avanzados de tipo russet que tenían el marcador molecular asociado con Ry chc. Se estableció la confirmación de la presencia de Ry chc después de la evaluación de campo e invernadero de los clones para detectar resistencia a PVY sin que se observara infección por el virus. Estos clones también se han caracterizado por tener resistencia al tizón tardío y al endulzamiento de los tubérculos inducido por el frío y todos machos fertiles también. El ensamblaje único de resistencias en este germoplasma tipo russet será de valor para la comunidad de mejoramiento de papa en el desarrollo de variedades de papa tipo russet, especialmente con respecto a Ry chc que anteriormente no se ha reportado previamente como presente en esta clase de papa en el mercado.
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16 November 2021
A Correction to this paper has been published: https://doi.org/10.1007/s12230-021-09854-z
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Funding
This work was partially funded by USDA-NIFA Specialty Crop Research Initiative award no. 2014-51181-22373 and by USDA-NIFA Specialty Crop Research Initiative award no. 2020-51181-32136.
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Elison, G.L., Novy, R.G. & Whitworth, J.L. Russet Potato Breeding Clones with Extreme Resistance to Potato Virus Y Conferred by Rychc as well as Resistance to Late Blight and Cold-Induced Sweetening. Am. J. Potato Res. 98, 411–419 (2021). https://doi.org/10.1007/s12230-021-09852-1
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DOI: https://doi.org/10.1007/s12230-021-09852-1