American Potato Journal

, Volume 57, Issue 7, pp 331–343 | Cite as

Glycoalkaloids and resistance to the Colorado potato beetle inSolanum chacoense Bitter

  • S. L. Sinden
  • L. L. Sanford
  • S. F. Osman
Article

Abstract

Resistance of 20 F2Solarium chacoense Bitter clones to the Colorado potato beetle,Leptinotarsa decemlineata (Say), was measured in a field test. Levels of total glycoalkaloids (TGA) and composición of the glycoalkaloid mixtures in foliage of the clones were also determined. Clones with either commersonine or dehydrocommersonine as the major foliar glycoalkaloid were significantly more resistant (lower damage ratings, fewer larvae and adult insects) than clones with solanine and chaconine. Damage ratings were negatively correlated (r = -0.67, p = 0.01) with foliar TGA levels. The results indicate that the types of glycoalkaloids present in the foliage ofS. chacoense may be as important as the level of TGA in limiting damage and numbers of insects.

Key Words

solanine chaconine commersonine leptines Solanum tuberosum Solanum chacoense Colorado potato beetle glycoalkaloids potato 

Resumen

Resistencia de 20 clones F2 deSolarium chacoense Bitter, al “Colorado potato beetle”,Leptinotarsa decemlineata (Say), se evaluó en una prueba de campo. Asimismo, se determinó niveles de glicoalcaloides totales (TGA) y composición de mezclas de glicoalcaloides en el follaje. Clones con cualquiera de los dos commersonine o dehydrocommersonine como el mayor componente de glicoalcaloide en el follaje fueron significativamente mas resistentes (lecturas bajas de daños, pocas larvas e insectos adultos) que clones con solanine y chaconine. Las lecturas de daño mostraron correlación negativa (r = -0.67, p = 0.01) con los niveles de glicoalcaloides totales en el follaje (GA). Los resultados indicaron que los tipos de glicoalcaloides presentes en el follaje deS. chacoense puede ser tan importante como el nivel de glicoalcaloides totales en la limitación del daño y número de los insectos.

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Copyright information

© Springer 1980

Authors and Affiliations

  • S. L. Sinden
    • 1
  • L. L. Sanford
    • 1
  • S. F. Osman
    • 2
  1. 1.Vegetable Laboratory, Horticultural Science Institute, Beltsville Agricultural Research Center, Science and Education Administration, Agricultural ResearchU.S. Department of AgricultureBeltsville
  2. 2.Eastern Regional Research Center, Science and Education Administration, Agricultural ResearchU.S. Department of AgriculturePhiladelphia

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