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Journal of Chemical Ecology

, Volume 27, Issue 9, pp 1749–1762 | Cite as

Interactions of Aphid Herbivory and Nitrogen Availability on the Total Foliar Glycoalkaloid Content of Potato Plants

  • D. A. Fragoyiannis
  • R. G. Mckinlay
  • J. P. F. D'Mello
Article

Abstract

In plant growth room (PGR) and open-air pot (OAP) experiments, potato cvs King Edward and Maris Piper were grown under two nitrogen levels or two different nitrogen release patterns. Plants were subjected to infestation by peach potato aphids Myzus persicae (Homoptera: Aphididae). Total glycoalkaloid (GA) levels were measured in the foliage of both infested and non-infested plants, before, during and after aphid infestation. In the PGR experiment, aphid infestation reduced the amounts of total GAs in both cultivars. This reduction is attributed to the sugar deficiency induced in the plants owing to the dense aphid colonization. Results from the OAP experiment showed a temporal increase of GAs produced by potato cv. King Edward plants subjected to aphid infestation. Elevated amounts of nitrogen in the nutrient solutions (PGR experiment) reduced total GAs, while no differences were observed between manure and fertilizer treated plants (OAP experiment). It is concluded that the source of available nitrogen does not affect foliar GA synthesis in potatoes, and as a consequence, does not affect its endogenous chemical defense against insect herbivory. The case for insect-induced chemical defense mechanisms as triggered by low rates of aphid infestation is discussed.

Aphid Aphididae Myzus persicae potato Solanum tuberosum glycoalkaloids solanine chaconine insect herbivory nitrogen chemical defense 

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Copyright information

© Plenum Publishing Corporation 2001

Authors and Affiliations

  • D. A. Fragoyiannis
    • 1
  • R. G. Mckinlay
    • 2
  • J. P. F. D'Mello
    • 2
  1. 1.Institute of Ecology and Resource ManagementThe University of EdinburghEdinburghUK
  2. 2.Scottish Agricultural CollegeEdinburghUK

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