title: Glycoalkaloid responses of potato to Colorado potato beetle defoliation.
abstract: Two experiments were conducted to measure the glycoalkaloid concentrations of potato tubers in response to Colorado potato beetle and manual defoliation. For plants defoliated by Colorado potato beetles, there was a significantly greater production of glycoalkaloids than in control plants and manually defoliated plants for both skin and inner tissue of tubers in experiment 1. In experiment 1, there was a 58.1% and 48.3% increase in glycoalkaloids in skin and inner tissue of tubers, respectively, from plants defoliated at high levels by Colorado potato beetles compared to control plants. In experiment 2, although a significant difference in glycoalkaloid concentration was not observed among the treatments, the skin and inner tissue of tubers from plants defoliated at high levels by Colorado potato beetles increased glycoalkaloid concentration by 23.4% and 14.5%, respectively, compared to tubers from control plants. In experiment 1, the concentration of tuber extract required to reduce Chinese hamster ovary (CHO) cellular proliferation by 50% was 10-fold less for the skin versus the inner tissue, indicating that skin tissue was more toxic under the in vitro conditions of this assay.
authors.affiliation: Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717-3120, USA.
authors.forename: Courtney L
authors.initials: CL
authors.lastname: Pariera Dinkins
authors.forename: Robert K D
authors.initials: RK
authors.lastname: Peterson
authors.forename: James E
authors.initials: JE
authors.lastname: Gibson
authors.forename: Qing
authors.initials: Q
authors.lastname: Hu
authors.forename: David K
authors.initials: DK
authors.lastname: Weaver
mesh_terms: D000470:Alkaloids / Q000009:adverse effects / Q000378:metabolism* / Q000633:toxicity; D000818:Animals; D016466:CHO Cells; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D002851:Chromatography, High Pressure Liquid; D001517:Coleoptera; D006224:Cricetinae; D003412:Cricetulus; D005612:Freeze Drying; D010936:Plant Extracts / Q000494:pharmacology; D018515:Plant Leaves / Q000502:physiology; D018517:Plant Roots / Q000737:chemistry; D012015:Reference Standards; D012306:Risk; D012449:Safety; D011198:Solanum tuberosum / Q000009:adverse effects / Q000378:metabolism*
chemical_list: D000470:Alkaloids; D010936:Plant Extracts