Abstract
The highly heterozygous and tetraploid nature of potato (Solanum tuberosum L. ssp.tuberosum) has hampered discovery of its wild ancestral species. Chloroplast DNA is a very reliable indicator to trace maternal ancestry of crops. Most of the common potato (grown worldwide) has unique, T-type chloroplast DNA derived from Chilean cultivated potato (both areS. tuberosum ssp.tuberosum). Analyzing seven different chloroplast DNA markers, I found all the T-type accessions of cultivated potatoes shared the same chloroplast DNA haplotype only with some accessions ofS. tarijense Hawkes and its derived hybrids. Thus, I conclude that some populations ofS. tarijense acted as the maternal ancestor of potato.
Resumen
La alta heterozigosis y naturaleza tetraploide de a papa (Solanum tuberosum L. ssp.tuberosum) ha dificultado el descubrimiento de su ascendiente silvestre ancestral. El DNA de cloroplastos es un indicador muy confiable para buscar el origen del ancestro materno de los cultivos. La mayoría de papas comunes (cultivadas mundialmente) tienen un singular ADN de cloroplastos tipo T derivado de la papa chilena cultivada (S. tubero-sum ssp.tuberosum). Al analizar siete marcadores diferentes de ADN de cloroplastos se encontró que todas las accesiones tipo T de papas cultivadas compartían el mismo haplotipo de ADN de cloroplasto solamente con algunas accesiones deS. tarijense Hawkes y sus hibridos derivados. Así, se concluye que algunas poblaciones deS. tarijense actuaron como ancestros maternos de la papa.
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Hosaka, K. T-type chloroplast DNA inSolarium tuberosum L. ssp.tuberosum was conferred from some populations ofS. tarijense Hawkes. Am. J. Pot Res 80, 21–32 (2003). https://doi.org/10.1007/BF02854553
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DOI: https://doi.org/10.1007/BF02854553