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Glycoalkaloid content in foliage of hybrid and backcross populations from aSolanum tuberosum X S. chacoense cross

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Abstract

The glycoalkaloid contents of foliage were measured in populations derived from a cross ofSolanum chacoense Bitter (PI 472810) with a composite sample of genotypes from a randomly matedSolanum tuberosum L. population. The mean total glycoalkaloid contents of the parent PI 472810 andtuberosum populations, and the F2 and F4 populations were 856, 121, 286, and 279 mg/100g fresh weight, respectively. The total glycoalkaloid content of the first backcross population, F2 xtuberosum, was 290 mg/100 g, close to the content of the F2. In a second backcross totuberosum, the mean total content was 148 mg/100 g, close to the content of the parenttuberosum population. Only the glycoalkaloids α-solanine and α-chaconine were found in PI 472810, whereas in the parenttuberosum, hybrid, and backcross populations, the glycoalkaloids α & β-solamarine also were found in a small number of genotypes. The ratios of chaconine to solanine contents were significantly (P≤.05) different in the parent PI 472810 andtuberosum populations, 2.55 and 2.12, respectively. The ratios in the F2 and F4 populations were similar to that of PI 472810, whereas the ratios in the backcross populations were closer to that of thetuberosum parent. The levels of foliage glycoalkaloids in the hybrid and backcross populations paralleled the levels of potato leafhopper,Empoasca fabae Harris, resistance measured in a previous study.

Compendio

Se midieron los contenidos de glicoalcaloides del follaje en poblaciones obtenidas de un cruzamiento de Solanum chacoense Bitter (PI 472810) con una muestra compuesta de genotipos de una población de Solanum tuberosum L. apareada al azar. Los contenidos promedio de gli coalcaloides del progenitor PI 472810, de las poblaciones tuberosum, y de las poblaciones F2 y F4 fueron, respectivamente, 856, 121, 286 y 279 mg/100g de peso fresco. El contenido total de glicoalcaloides de la primera poblacion de retrocruzamiento, F2 x tuberosum, fue 290 mg/g, cercano al contenido de la F2. En un segundo retrocruzamiento a tuberosum, el contenido total promedio fue 148 mg/g, cercano al contenido de la población progenitora tuberosum. Sólo los glicoalcaloides--solanina y--chaconina fueron encontrados en PI 472810, mientras que en las poblaciones progenitoras tuberosum, híbridas y de retrocruzamiento, los glicoalcaloides y β-solamarina fueron también encontrados en un número pequeno de genotipos. Las relaciones de los contenidos de chaconina y solanina fueron significativamente (Ps.05) diferentes en el progenitor PI 472810 y en las poblaciones tuberosum, 2.55 y 2.12, respectivamente. Las relaciones en las poblaciones F2 y F4 fueron similares a la de PI 472810, mientras que las relaciones en las poblaciones de retrocruzamiento fueron cercanas a las del progenitor tuberosum. Los niveles de glicoalcaloides foliares en las poblaciones híbridas y de retrocruzamiento fueron paralelos a los niveles de la cigarrita de la papa, Empoasca fabae Harris, resistencia que fuera medida en un estudio anterior.

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Sanford, L.L., Deahl, K.L. & Sinden, S.L. Glycoalkaloid content in foliage of hybrid and backcross populations from aSolanum tuberosum X S. chacoense cross. American Potato Journal 71, 225–235 (1994). https://doi.org/10.1007/BF02849288

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