Abstract
Levels of total glycoalkaloids (TGA) in foliage of 10 wild, tuberbearingSolanum (Tourn.) L. species differentially resistant to infestation by the potato leafhopper,Empoasca fabae (Harris), were determined. Levels of TGA ranged from a high of 688 mg/100 g fresh wt. in a resistant species,S. polyadenium Greenm. to a low of 13 mg/100 g fresh wt. in a susceptible species,S. bulbocastanum Dun. Foliar concentration of TGA and nymphal infestation by the potato leafhopper were highly correlated (r = −0.75, p = 0.01). The significant correlation of TGA levels and potato leafhopper resistance suggests that foliar TGA may be a significant factor in the defense of wild potato species against this pest.
Resumen
Los niveles de glicoalcaloides totales (TGA) en las hojas de 10 especies silvestres del géneroSolanum que producen tubérculos, diferencialmente resistentes a la infestación por el saltahojas de la papaEmpoasca fabae (Harris), fueron determinados. Los niveles de TGA variaron desde un nivel alto de 688 mg/100 gramos de peso fresco, en una especie resistente,S. polyadenium Greenm. a un nivel bajo de 13 mg/100 gr. de peso fresco, en una especie susceptible,S. bulbocastanum Dun. La concentración foliar de TGA y la infestación ninfal del saltahojas de la papa fueron altamente correlacionados (r = −0.75, p = 0.01). La correlación significativa de niveles de TGA y la resistencia al saltahojas de la papa sugiere que el TGA foliar podría ser un factor significativo en la defensa de las especies silvestres de papa contra esta plaga.
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A publication of the Cornell University Agricultural Experiment Station, New York State College of Agriculture and Life Sciences, a Statutory College of S.U.N.Y.
Formerly Post-doctoral Fellow
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Tingey, W.M., Mackenzie, J.D. & Gregory, P. Total foliar glycoalkaloids and resistance of wild potato species toEmpoasca fabae (Harris). American Potato Journal 55, 577–585 (1978). https://doi.org/10.1007/BF02852214
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DOI: https://doi.org/10.1007/BF02852214