Abstract
Acceptable chip color and high specific gravity are important characteristics for chipping potatoes. High specific gravity in US chipping varieties traces back to B5141-6 (Lenape). In an effort to expand the germplasm base for high specific gravity, a long-day adapted diploid hybrid Solanum phureja–S. stenotomum population with high specific gravity was developed. The purposes of this study were to evaluate this population for its chipping potential and estimate heritability for chip color and specific gravity. The population consisted of four clones from each of 72 maternal half-sib families and represents the third cycle of selection for high specific gravity in this population. Clones were grown in a randomized complete block design at Presque Isle, Maine in 2004 and 2005 along with the check variety ‘Atlantic’. Five tubers from each clone per replicate were processed into chips in early December following 10°C storage both years. Individual chips were rated on a 1–10 scale, with ≤7 considered an acceptable color. The average chip scores of the diploid clones and Atlantic were 7.3 and 6.8, respectively. The average specific gravities of the diploid clones and Atlantic were 1.099 and 1.091, respectively. Four diploid clones had significantly higher specific gravity and lighter chip color than Atlantic; 93 diploid clones had significantly higher specific gravity and chip color equal to Atlantic. Broad-sense heritabilities and their 95% confidence interval for chip color and specific gravity were 0.68 (0.59–0.74) and 0.78 (0.70–0.81), respectively. Narrow-sense heritabilities for chip color and specific gravity were 0.24 ± 0.26 and 0.32 ± 0.26, respectively. About one-third of the population possesses both high specific gravity and acceptable chip color and could prove useful in expanding the tetraploid germplasm base for processing traits.
Resumen
Un color aceptable de hojuelas y gravedad específica alta son características importantes para hacer hojuelas de papa. La gravedad específica de las variedades para hojuelas en USA se remonta a B5141-6 (Lenape). En un esfuerzo para incrementar la base del germoplasma para gravedad específica, se desarrolló una población del híbrido diploide de Solanum phureja–S. stenotomum, adaptada a día largo y con gravedad específica alta. El propósito de este estudio fue evaluar el potencial de esta población para hacer hojuelas y estimar la herencia del color y la gravedad específica. La población consistió de cuatro clones de cada una de las 72 familias de medios hermanos maternos y representa el tercer ciclo de selección para gravedad específica. Los clones crecieron en un diseño de bloque completo al azar en la Isla de Presque, Maine en 2004 y 2005 junto con la variedad testigo ‘Atlantic’. Cinco tubérculos de cada clon por repetición fueron procesados en hojuelas a principios de Diciembre después de almacenamiento a 10°C en ambos años. Las hojuelas fueron individualmente clasificadas con una escala del 1 al 10, y ≤7 consideradas de un color aceptable. El promedio de puntaje de las hojuelas de clones diploides y de Atlantic fue de 7.3 y 6.8, respectivamente. El promedio de gravedad específica de los clones diploides y de Atlantic fue de 1.099 y 1.091, respectivamente. Cuatro clones diploides tuvieron significativamente más alta gravedad específica y color más claro de hojuelas que Atlantic; 93 clones diploides tuvieron significativamente mayor gravedad específica y color de hojuelas igual que Atlantic. La heredabilidad en sentido amplio y su 95% del intervalo de confianza para color de hojuelas y de gravedad específica fue de 0.68 (0.59–0.74) y 0.78 (0.70–0.81), respectivamente. La heredabilidad en sentido estrecho para color de hojuelas y gravedad específica fue de 0.24 ± 0.26 y 0.32 ± 0.26, respectivamente. Alrededor del tercio de la población posee una alta gravedad específica y color de hojuelas aceptable y puede ser útil para incrementar el germoplasma tetraploide base, para características de procesamiento.
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Abbreviations
- phu-stn :
-
S. phureja-S. stenotomum
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Acknowledgement
Thanks to Karl DeLong, Merle Bragg, Bonnie Adams, and Charles Lagasse for technical assistance. Thanks to Pokuaa Owusu-Acheaw for help with constructing the figures.
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Haynes, K.G. Heritability of Chip Color and Specific Gravity in a Long-day Adapted Solanum phureja–S. stenotomum Population. Am. J. Pot Res 85, 361–366 (2008). https://doi.org/10.1007/s12230-008-9036-0
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DOI: https://doi.org/10.1007/s12230-008-9036-0