American Potato Journal

, Volume 72, Issue 5, pp 261–271 | Cite as

Glycoalkaloid content in tubers of hybrid and backcross populations from aSolanum tuberosumx s. chacoense cross

  • L. L. Sanford
  • K. L. Deahl
  • S. L. Sinden
  • R. S. Kobayashi


The glycoalkaloid contents of tubers were measured in hybrid and back-cross populations derived from a cross ofSolarium chacoense Bitter (PI 472810, 2n=2x=24) withSolanum tuberosum L. (2n=4x=48). In tubers sampled from near the median size in each population and parent, the mean total glycoalkaloid (TGA) contents of theS. chacoense andS. tuberosum parent genotypes, and the F2 and F4 hybrid genotypes were 245, 4, 39, and 35 mg/ 100 g fresh weight (fw), respectively. Backcrossing the F2 genotypes toS. tuberosum reduced the mean TGA content to 15 mg/100 g fw. A second backcross further reduced the content to 9 mg/100 g fw. However, some genotypes in both backcross populations (25% and 10%) had TGA contents above the generally accepted upper limit of 20 mg/100 g fw. Tuber size was significantly smaller in theS. chacoense parent and the hybrid populations compared with the size in theS. tuberosum parent and backcross populations. In a second sampling of tubers from each population, intentionally selected to equalize tuber size among populations, the mean tuber size for populations was reduced by 79%. The mean population TGA content increased by 44%. However, the differences and rankings among parent, hybrid, and backcross populations were the same for both tuber samplings.

Additional Keywords

Potato solanine chaconine leafhopper 


Se midieron los contenidos de glicoalcaloides en tubérculos de poblaciones de híbridos y retrocruzamientos obtenidos de un cruzamientos deSolarium chacoense Bitter (PI 472810, 2n=2x=24) withSolanum tuberosum L. (2n=4x=48). En las muestras de tubérculos de tamaño aproximadamente mediano de cada población y progenitor, los contenidos totales promedio de glicoalcaloides (TGA) de los genotipos progenitores deS. chacoense y S. tuberosumy de los genotipos híbridos F2 y F4 fueron 245, 4, 39, y 35 mg/100 g de peso fresco (fw), respectivamente. El retrocruzamiento de los genotipos F2 aS. tuberosum redujo el contenido promedio de TGA a 15 mg/100 g fw. Un segundo retrocruzamiento redujo nuevamente el contenido a 9 mg/ 100 g fw. Sin embargo, algunos genotipos en ambas poblaciones de retrocruzamiento (25% y 10%) tuvieron contenidos de TGA por encima del limite máximo de 20 mg/100 g fw generalmente aceptado. El tamaño de los tubérculos fue significativamente menor en el progenitorS. chacoense y en la poblaciones híbridas en comparación con el tamaño en el progenitor 5.tuberosum y en las poblaciones de retrocruzamiento. En una segunda muestra de tubérculos de cada población, intencionalmente seleccionada para igualar el tamaño de los tubérculos entre las poblaciones, el tamaño promedio de los tubérculos para las poblaciones se redujo aproximadamente en 79%. El promedio del contenido de TGA por población se incrementó alrededor de 44%. Sin embargo, las diferencias y clasificaciones entre progenitores, híbridos y poblaciones de retrocruzamiento fueron las mismas para ambas muestras de tubérculos.


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Copyright information

© Springer 1995

Authors and Affiliations

  • L. L. Sanford
    • 1
  • K. L. Deahl
    • 1
  • S. L. Sinden
    • 1
  • R. S. Kobayashi
    • 1
  1. 1.Agricultural Research Service, Plant Science Institute, Vegetable LaboratoryU.S. Department of AgricultureBeltsville

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