Abstract
Inbreeding depression occurs in haploid (2n = 2X = 24) potatoes (Solarium tuberosum L.) extracted from tetraploid (2n = 4X = 48) potatoes. This depression has been postulated to occur due to the loss of intralocus interactions, the loss of favorable epistatic combinations in normal meiosis, inbreeding depression, or the exposure of deleterious genes. The inbreeding coefficient of haploids extracted from tetraploids is derived in this paper. This inbreeding coefficient is a function of the inbreeding levels in the parents, the coefficient of coancestry of the parents, and the coefficient of double reduction. When the coefficient of double reduction is greater than zero, the inbreeding coefficient of the haploid is greater than the inbreeding coefficient of the tetraploid from which it was extracted. The implications of these results on breeding strategies employing haploids is discussed.
Compendio
Ocurre una depresion del retrocruzamiento en papas (Solanum tuberosum L.) haploides (2n = 2x = 24) extraídas de papas tetraploides (2n = 4x = 48). Se ha asumido que esta depresión ocurre debido a la pérdida de interacciones de intralocus, a la pérdida de combinaciones epistáticas favorables en meiosis normales, a la depresión del retrocruzamiento, o a la exposición de genes perniciosos. En este documento, se obtiene el coeficiente del retrocruzamiento de haploides extraídos de tetraploides. Este coeficiente de retrocruzamiento es una función de los niveles de retrocruzamiento en los padres, el coeficiente de la coascendencia de los mismos, y el coeficiente de doble reducción. Cuando el coeficiente de doble reducción es mayor que cero, el coeficiente de retrocruzamiento del haploide es mayor que el coeficiente de retrocruzamiento del tetraploide del que fue extraído. Se discute las implicancias de estos resultados sobre las estrategias de mejoramiento que emplean haploides.
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Haynes, K.G. Some aspects of inbreeding in haploids of tetraploidSolanum tuberosum L.. American Potato Journal 70, 339–344 (1993). https://doi.org/10.1007/BF02851427
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DOI: https://doi.org/10.1007/BF02851427