Abstract
A group of biparental crosses of breeding clones and varieties (Solanum tuberosum subsp.tuberosum) from the USDA potato breeding program, Beltsville, MD, was used to establish two randomly mated populations. Random mating without selection was continued for seven generations, then cycles 1, 3, 5, and 7 were tested for yield and specific gravity.
There was a small but non-significant decrease in tuber weight per hill, and a small but non-significant increase in tuber number from cycle 1 to cycle 7. Mean tuber weight significantly (P < 0.01) decreased (12%) from cycle 1 to cycle 7. Specific gravity also significantly (P < 0.10) decreased over cycles. The variance of clones within cycles did not significantly change over cycles for any of the traits measured.
Resumen
Un grupo de cruzamientos biparentales de clones mejorados y variedades (Solanum tuberosum subsp.tuberosum) del programa de mejoramiento de papa del “USDA,” Beltsville, MD, se usaron para establecer dos poblaciones de cruzamiento al azar. Cruzamientos al azar sin seleción se continuó por 7 generaciones; de las cuales los ciclos 1, 3, 5 y 7 fueron evaluados para rendimiento y gravedad específica.
Hubo una pequeña disminución en peso de tubérculo por planta y un pequeño incremento en número de tubérculos, ambos no significativos desde el primer ciclo al sétimo. El peso promedio de tubérculo disminuyó significativamente (P 0.01) 12% del ciclo 1 al 7. La gravedad específica también disminuyó significativamente (P 0.10) durante dichos ciclos. La variación de clones dentro de los ciclos no cambió significativamente durante los ciclos para ninguno de los atributos medidos.
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Sanford, L.L. Effect of random mating on yield and specific gravity in twoSolanum tuberosum subsp.tuberosum populations. American Potato Journal 56, 597–607 (1979). https://doi.org/10.1007/BF02853991
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DOI: https://doi.org/10.1007/BF02853991