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The United States Potato Genebank Holding of cv. Desiree is a Somatic Mutant of cv. Urgenta

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Genome-wide markers enable routine confirmation of whether varieties are true-to-type, and when they are not, to infer their identity. The objective of this study was to determine the basis of a previously described chromosome translocation, tr8-7, which was apparently polymorphic among holdings of the tetraploid potato (Solanum tuberosum L.) cultivar Desiree. Through analysis of publicly available genotype data from North American and European tetraploid potato germplasm, we resolved a longstanding mistaken identity of the United States Potato Genebank holding of Desiree, which is actually a somatic mutant of its maternal parent, cv. Urgenta. Comparison of multiple holdings revealed that tr8-7 was a somatic mutation that occurred at least 25 years ago and was maintained in isolated lineages. Holdings from other institutions lacked tr8-7 and were confirmed as Desiree by trio analyses, suggesting that the mixup affected the United States Potato Genebank and institutions that received Desiree from there. In the face of inevitable mutations and human error, we recommend validation of potato germplasm collections with pedigree and genomic information. To that effect, we provide molecular markers to distinguish the varieties investigated in this study.


Los marcadores de todo el genoma permiten la confirmación rutinaria de si las variedades son fieles al tipo, y cuando no lo son, inferir su identidad. El objetivo de este estudio fue determinar la base de una translocación cromosómica previamente descrita, tr8-7, que aparentemente era polimórfica entre las particularidades de la variedad tetraploide de papa (Solanum tuberosum L.) Desiree. A través del análisis de datos de genotipos disponibles públicamente del germoplasma tetraploide de papa de América del Norte y Europa, resolvimos una identidad errónea de largo tiempo de las particularidades de Desiree del Banco de Germoplasma de la Papa de los Estados Unidos, que en realidad es un mutante somático de su progenitor materno, cv. Urgenta. La comparación de múltiples particularidades reveló que tr8-7 era una mutación somática que ocurrió hace al menos 25 años y se mantuvo en linajes aislados. Las particularidades de otras instituciones carecían de tr8-7 y fueron confirmadas como Desiree por análisis triples, lo que sugiere que la confusión afectó al Banco de Germoplasma de la Papa de los Estados Unidos y a las instituciones que recibieron Desiree de allí. Ante las mutaciones inevitables y el error humano, nosotros recomendamos la validación de las colecciones de germoplasma de papa con pedigrí e información genómica. Para ello, proporcionamos marcadores moleculares para distinguir las variedades investigadas en este estudio.

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Financial support for this research was provided by National Science Foundation Plant Genome Integrative Organismal Systems (IOS) Grant 1956429 (Variants and Recombinants without Meiosis) to L.C.

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Amundson, K.R., Henry, I.M. & Comai, L. The United States Potato Genebank Holding of cv. Desiree is a Somatic Mutant of cv. Urgenta. Am. J. Potato Res. 100, 27–38 (2023).

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