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Persistence over time, overlapping distribution and molecular indications of interspecific hybridization in wild potato populations of Northwest Argentina

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Abstract

Solanum gourlayi and Solanum spegazzinii, wild potatoes endemic to Argentina, possess desirable traits for breeding. In periodical regenerations of accessions, variability was detected for morphology and breeding barriers. The persistence of these populations in nature was evaluated after more than 20 years. Both species were observed in all visited sites, along with other wild and cultivated potatoes. Chromosome numbers coincided with the originally reported, except for one population of Solanum gourlayi, with diploid and tetraploid cytotypes. The accompanying flora and environmental conditions revealed important alterations as the result of road construction, excessive stocking rates and overgrazing. Principal coordinate and cluster analyses and an AMOVA using AFLP data of three original accessions and the corresponding new accessions revealed high molecular variability and extensive overlapping. Plant grouping of accessions occurred at a distance of 0.58 for S. gourlayi, 0.62 for S. spegazzinii and 0.67 for both species. The role of natural hybridization and sexual polyploidization in the evolution of sympatric populations of wild potatoes is discussed.

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Notes

  1. Abbreviation proposed by Simmonds (1963).

  2. Collectors: A. M. Clausen, L. E. Erazzú

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Acknowledgments

This research was financially supported by the Instituto Nacional de Tecnología Agropecuaria (INTA), National Project No. 744, and the Universidad Nacional de Mar del Plata (UNMdP).

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Authors and Affiliations

  1. Estación Experimental Agropecuaria (EEA) Famaillá, Instituto Nacional de Tecnología Agropecuaria (INTA), C.C. 9, 4132, Famaillá, Tucumán, Argentina

    Luis E. Erazzú

  2. Estación Experimental Agropecuaria (EEA) Balcarce, Instituto Nacional de Tecnología Agropecuaria (INTA), C.C. 256, 7620, Balcarce, Buenos Aires, Argentina

    Elsa L. Camadro & Andrea M. Clausen

  3. Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata (UNMdP), Mar del Plata, Buenos Aires, Argentina

    Elsa L. Camadro

  4. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina

    Elsa L. Camadro

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  1. Luis E. Erazzú
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  2. Elsa L. Camadro
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  3. Andrea M. Clausen
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Correspondence to Elsa L. Camadro.

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This paper is a part of first author’s Doctoral thesis.

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Erazzú, L.E., Camadro, E.L. & Clausen, A.M. Persistence over time, overlapping distribution and molecular indications of interspecific hybridization in wild potato populations of Northwest Argentina. Euphytica 168, 249–262 (2009). https://doi.org/10.1007/s10681-009-9938-z

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