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Segregation of leptine glycoalkaloids and resistance to Colorado potato beetle (Leptinotarsa decemlineata (Say)) in F2Solanum tuberosum (4x) ×S. chacoense (4x) potato progenies

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Abstract

Solanum chacoense Bitter is resistant to the Colorado potato beetle (CPB),Leptinotarsa decemlineata (Say). Resistance has been associated with the presence of a rare class of glycoalkaloids, the leptines. In this study, seven tetraploid, F2S. tuberosum xS. chacoense families were evaluated for foliar production of leptines I and II, leptinines I and II, and α-solanine and α-chaconine; and screened for resistance to CPB in the laboratory and field. Resistance was correlated with the concentrations of glycoalkaloids on a family and an individual basis. Leptine concentrations ranged from undetectable to a high of 18.0 mg/g dry weight. All of the progeny produced solanine and chaconine. Family 9623 had the highest mean leptine concentration and the lowest mean leaf disk feeding and CPB defoliation levels. Family 9616 had the lowest mean glycoalkaloid concentration and ranked as one of the most susceptible families. Regression analyses of solanine + chaconine, leptine I and II, and leptinine I and II foliar concentrations versus leaf disk consumption and field defoliation revealed that only increased foliar levels of leptines resulted in decreased CPB feeding. The regression models for leptines versus leaf disk consumption and field defoliation were highly significant, accounting for 17% and 26% of the variation in consumption and defoliation, respectively. To the best of our knowledge, this is the first work reporting the impact of leptine and leptinine concentrations on CPB feeding in tetraploid,S. tuberosum xS. chacoense potato hybrids. Results are discussed within the context of breeding for resistance to CPB.

Resumen

Solanum chacoense Bitter es resistente al escarabajo de la papa (CPB),Leptinotarsa decemlineata (Say). La resistencia ha sido asociada con la presencia de una clase rara de glicoalcaloides, los leptinos. En este estudio, siete familias tetraploides, F2S. tubero-sum x S. chacoense fueron evaluadas por la producción foliar de leptinos I y II, leptininos I y II, y α-solanina y ochaconina, y revisadas por su resistencia al escarabajo de la papa en el laboratorio y el campo. La resistencia fue correlacionada con las concentraciones de glicoalcaloides sobre una base familiar e individual. Concentraciones de leptinos se extendieron de no percibidas hasta un máximo de 18.0 mg/g peso seco. Toda la progenie producía solanina y chaconina. La familia 9623 tenía el promedio de concentración más alto de leptinos, y el promedio más bajo tanto para el consumo de discos de hoja, como en los niveles de defoliación por el escarabajo de la papa. La familia 9616 demostro el promedio de concentración más bajo de glicoalcaloides, y se mostró como una de las familias mas susceptibles. Los análisis de regresión de solanina + chaconina, y las concentraciones foliares de leptino I y II, y leptinino I y II contra el consumo de discos de hoja y la defoliación en campo, revelaron que solo los niveles foliares aumentados de leptinos resultaron en una alimentación reducida de parte del escarabajo de la papa. Los modelos de regresión para leptinos contra el consumo de discos de hoja, y la defoliación en el campo, fueron sumamente signifcantes, y explicaron el 17% y el 26% de la variación en el consumo y la defoliación, respectivamente. Que sepamos, este es el primer trabajo que informa del impacto de concentraciones de leptinos y leptininos sobre el consumo que realiza el escarabajo de la papa de los híbridos de papa tetraploides 5.tuberosum x S. chacoense. Los resultados se evalúan dentro del contexto de la crianza para la resistencia al escarabajo de la papa.

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Correspondence to G. Craig Yencho.

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Yencho, G.C., Kowalski, S.P., Kennedy, G.G. et al. Segregation of leptine glycoalkaloids and resistance to Colorado potato beetle (Leptinotarsa decemlineata (Say)) in F2Solanum tuberosum (4x) ×S. chacoense (4x) potato progenies. Am. J. Pot Res 77, 167–178 (2000). https://doi.org/10.1007/BF02853941

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