Interactions of aphid herbivory and nitrogen availability on the total foliar glycoalkaloid content of potato plants

Citation
Da. Fragoyiannis et al., Interactions of aphid herbivory and nitrogen availability on the total foliar glycoalkaloid content of potato plants, J CHEM ECOL, 27(9), 2001, pp. 1749-1762
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF CHEMICAL ECOLOGY
ISSN journal
0098-0331 → ACNP
Volume
27
Issue
9
Year of publication
2001
Pages
1749 - 1762
Database
ISI
SICI code
0098-0331(200109)27:9<1749:IOAHAN>2.0.ZU;2-J
Abstract
In plant growth room (PGR) and open-air pot (OAP) experiments. potato cvs K ing Edward and Maris Piper were grown under two nitrogen levels or two diff erent nitrogen release patterns, Plants were subjected to infestation by pe ach potato aphids Myzus persicae (Homoptera: Aphididae). Total glycoalkaloi d (GA) levels were measured in the foliage of both infested and non-infeste d plants, before, during and after aphid infestation. In the PGR experiment , aphid infestation reduced the amounts of total GAs in both cultivars. Thi s reduction is attributed to the sugar deficiency induced in the plants owi ng to the dense aphid colonization. Results from the OAP experiment showed a temporal increase of GAs produced by potato cv. King Edward plants subjec ted to aphid infestation. Elevated amounts of nitrogen in the nutrient solu tions (PGR experiment) reduced total GAs, while no differences were observe d between manure and fertilizer treated plants (OAP experiment). It is conc luded that the source of available nitrogen does not affect foliar GA synth esis in potatoes, and as a consequence, does not affect its endogenous chem ical defense against insect herbivory. The case for insect-induced chemical defense mechanisms as triggered by low rates of aphid infestation is discu ssed.