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Inheritance of tuber initiation in tuber bearingSolanum as influenced by photoperiod

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Abstract

Eight potato clones (three day-neutral (DN) Tuberosum, one dayneutral and four short-day (SD) Andigena) were used as parents. Eight genetic sets bearing P1, P2, P1⊗, P2⊗, F1, F2, BC1, and BC2 generations were developed. Two sets were DN×DN crosses, four SD×DN, and two SD×SD. Tuber initiation (TI) was evaluated in growth chambers with daylengths of 11, 13, and 15 hours. The stolons of each genotype were examined every eight days between the 38th and 86th day after planting. F1 generation means from SD×DN crosses showed complete dominance of SD reaction (late TI) over DN reaction (early TI). F1 generation means from DN × DN and SD× SD crosses showed either no dominance or a slight tendency towards the late TI parent. Within plot variances of the selfed generations suggested a variable degree of parental heterozygosity for the loci controlling TI. Andigena clones showed the greatest heterozygosity. Bell shaped frequency distributions in the segregating generations indicated that TI was under the control of several genes. It appears also that major and minor genes were involved. Broad sense heritability estimates of about 90% at 11 hours and 55% at 15 hours of daylength were computed.

Resumen

Ocho clones de papas (tres Tuberosum de dia neutro (DN) y cinco Andigena, uno de dia neutro y cuatro de dia corto (DC) fueron usados como progenitores. Se obtuvieron ocho conjuntos genéticos, cada uno formado por las generaciones P1, P2, P1⊗, P2⊗, F1, F2, BC1 y BC2. Dos conjuntos fueron formados por cruces DN×DN, cuatro por DC×DN y dos por DC×DC. La iniciación de la tuberización (IT) fue evaluada en cámaras de crecimiento bajo longitudes de dia de 11, 13 y 15 horas. Los estolónes de cada genotipo fueron examinados cada ocho dias entre los 38 y 86 dias después de la siembra. El valor promedio de la generatión F1 en los cruces DC×DN mostraron dominancia completa de la reacción de dia corto (IT tardía) sobre la reactión de dia neutro (IT precoz). El valor promedio de la generatión F1 en los cruces DN×DN y DC×DC mostraron ausencia de dominancia o una leve tendencia hacia el progenitor de IT tardía. Las variancias dentro de las unidades experimentales sugirieron un grado variable de heterocigosidad en los loci que controlan IT. Los progenitores del grupo Andigena mostraron le mayor heterocigosidad. Las distribuciones continuas en forma de campana que se observaron en las generaciones segregantes indicaron que IT esta bajo control de muchos genes. Aparentemente, en el control de este carácter están involucrados genes mayores y menores. Se obtuvieron estimados de heredabilidad (σ2/σ2p) cuyos valores flucturaron entre 90% a 11 horas y 55% a 15 horas de longitud de dia.

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Author notes

  1. F. L. Haynes (Professor, Departments of Horticultural Science Genetics)

    Present address: Associate Geneticist at the International Potato Center, Apartado 5969, Lima, Peru

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    1. H. A. Mendoza
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    2. F. L. Haynes
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    Additional information

    Paper No. 4541 of the Journal Series of the North Carolina Agricultural Experiment Station Raleigh, N.C. 27607. Portion of a thesis submitted by the senior author as a partial fulfillment for the Ph.D. degree. This work was supported in part by funds of a research contract from the International Potato Center.

    Former graduate student, Department of Genetics

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    Mendoza, H.A., Haynes, F.L. Inheritance of tuber initiation in tuber bearingSolanum as influenced by photoperiod. American Potato Journal 54, 243–252 (1977). https://doi.org/10.1007/BF02849872

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