Abstract
DNA fingerprinting is a valuable tool for plant cultivar discrimination and identification. Simple Sequence Repeat (SSR) markers represent an excellent option for obtaining DNA fingerprints of potatoes in an easy, fast, and reliable fashion. The highly polymorphic and co-dominant nature of SSRs gives them good discrimination power to declare the distinctiveness of new potato clones for Plant Variety Protection (PVP) and to properly identify existing cultivars. They are also useful for confirming origin and avoiding duplications and mixtures in breeding, foundation and certification programs, and also during growing and marketing stages. A total of 54 (50 tetraploid and 4 diploid) potato clones, including new cultivars released by the Pacific Northwest Tri-State Potato Variety Development Program and a set of common commercial cultivars, were analyzed using 25 SSR markers. Marketing classes (French fry processing, fresh market, and chip processing) were clearly separated using those markers. We have empirically selected a subset of six SSRs that differentiate all the potato varieties and clones present in the study. This subset of six SSR markers could be used for practical DNA fingerprinting. In order to declare distinctiveness, we recommend that common reference varieties always be genotyped together with the newly tested potato clones and that focus be placed on the relative allelic differences between the new clones and the reference varieties.
Resumen
La huella genética es una valiosa herramienta para identificar y diferenciar cultivares vegetales. Los marcadores basados en repeticiones de secuencias simples (SSR) son una excelente opción para obtener huellas genéticas en papas de una manera fácil, rápida y eficaz. La naturaleza co-dominante y el alto polimorfismo de los marcadores SSR permiten tener un alto poder discriminatorio para declarar la singularidad de los nuevos clones de papa para la Protección de Variedades Vegetales (PVP) e identificación de cultivares existentes. Son también útiles para confirmar el origen de los cultivares y evitar así duplicidades y mezclas en los programas de mejoramiento, fundación y certificación así como en las etapas posteriores de cultivo y comercialización. Un total de 54 clones de papa (cincuenta tetraploides y cuatro diploides), incluyendo los cultivares más recientes desarrollados por el Programa Tri-estatal de Desarrollo de Variedades de Papa de la Región del Pacífico Noroccidental y un conjunto de cultivares comerciales de uso común, fueron analizados usando 25 marcadores SSR. Usando estos marcadores, los cultivares fueron claramente diferenciados según su uso final (procesamiento para papas fritas, papa tipo chip y uso en fresco). Empíricamente se seleccionó un grupo de seis marcadores SSR que diferencian los 54 clones y variedades presentes en este estudio. Este subconjunto de seis marcadores podría usarse en la práctica para determinar la huella genética. Para declarar la singularidad de variedades y clones recomendamos incluir variedades conocidas de referencia en el proceso de genotipado junto con los clones nuevos que van a evaluarse con especial énfasis en las diferencias relativas de los alelos presentes entre las variedades de referencia y los nuevos clones.
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Acknowledgments
The USDA-NIFA (United States Department of Agriculture National - Institute of Food and Agriculture) special potato grant ‘Potato Variety Development and Improvement in the Northwest’ provided financial support for this research. We thank the United States Potato Genebank, the Oregon and Idaho Potato Foundation Programs, Drs. Herman J. van Eck, Merideth Bonierbale and Julio Kalazich for providing potato clones for this study and Brigid Meints for editing and Dr. Jeff Leonard for reviewing the manuscript. Thanks are extended to graduate and undergraduate students from the Oregon Potato Breeding and Genetics Program for technical assistance.
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Description of the 54 potato varieties and clones used in the present study (DOCX 24 kb)
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Karaagac, E., Yilma, S., Cuesta-Marcos, A. et al. Molecular Analysis of Potatoes from the Pacific Northwest Tri-State Variety Development Program and Selection of Markers for Practical DNA Fingerprinting Applications. Am. J. Potato Res. 91, 195–203 (2014). https://doi.org/10.1007/s12230-013-9338-8
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DOI: https://doi.org/10.1007/s12230-013-9338-8