Abstract
Changes in yielding ability were studied in a population of Andigena which had been subjected to six cycles of selection. Significant increases were detected for percent tuberization, mean yield per hill, mean tuber weight, and average rating for tuber appearance. The earliest improvement in yield was largely the result of improving percentage of tuberization. Later gains came from improving mean tuber weight as well as continued improvement in percentage of tuberization. The largest improvement was observed during the last cycle of selection.
Changes in combining ability were studied in twenty test-crosses produced by pollinating fourTuberosum females with bulked pollen from plants within each of five of the sixAndigena cycles. Appreciable gains were observed for total yield, mean tuber weight, and yield of large tubers. The most advanced hybrids outyielded a comparable group of sevenTuberosum ×Tuberosum progenies with regards to total yield, tuber number, and yield of large tubers. Mean tuber weight was similar in both groups.
The overall results suggest the potential ofAndigena in the production of inter-group hybrids. The results also indicate that the limits of improvement in theAndigena population have not yet been reached and that the combining ability with Tuberosum should continue to improve.
Resumen
Se han estudiado los cambios en la capacidad de rendimiento de una poblaci’on de Andigena sujeta a seis ciclos de selectión. Se determinaron incrementos significativos para el porcentaje de tuberización, rendimiento promedio por planta, rendimiento promedio de tubérculo y promedio de calificación para la aparencia del tubérculo. El incremento inicial en rendimiento fue mayormente el resultado de mejorar el porcentaje de tube-rización. Los incrementos posteriores fueron el resultado de mejoras en el rendimiento promedio del tubérculo al igual que mejoras contínuas en el porcentaje de tuberización. La mejora más significativa se observó durante el último ciclo de: selectión.
Se estudiaron los cambios en la habilidad combinatoria de veinte cruces de pruebas producidos por la polinización de cuatro hembrasTuberosum con una mezcla de polen proveniente de plantas dentro de cada uno de los cruces de los seis ciclos deAndigena. Se observaron apreciables ganancias para el rendimiento total, peso promedio de tubérculo y rendimiento de tubérculos grandes. Los hibridos más avanzados superaron a un grupo comparable de progenies de siete hibridosTuberosum xTuberosum con respecto al rendimiento total, número de tubérculos y rendimiento de tubérculos grandes. El rendimiento promedio de tubérculo fue similar en ambos grupos.
Los resultados totales sugieron el potencialde Andigena en la producción de hibridos inter-grupos. Estos resultados también indican que los límites de mejoramiento en las población de Andigena, todavía no han sido alcanzados y que la habilidad combinatoria conTuberosum continuará sujeta a mejoramiento.
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Paper No. 703. Department of Plant Breeding and Biometry. Cornell University, Ithaca, NY 14853. This research paper was supported in part by the International Potato Center, Lima, Peru.
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Munoz, F.J., Plaisted, R.L. Yield and combining abilities in Andigena potatoes after six cycles of recurrent phenotypic selection for adaptation to long day conditions. American Potato Journal 58, 469–479 (1981). https://doi.org/10.1007/BF02874544
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DOI: https://doi.org/10.1007/BF02874544