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Insect feeding preferences and plant phenolic glucosides in the system Gonioctena linnaeana-Salix triandra
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2005 (English)In: Entomologia Experimentalis et Applicata, ISSN 0013-8703, E-ISSN 1570-8703, Vol. 115, no 1, 61-66 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to investigate the preference of a leaf beetle to different Salix clones, and to relate this preference to plant chemistry. The preference of Gonioctena linnaeana Schrank (Coleoptera: Chrysomelidae) was tested in cafeteria experiments using its host Salix triandra L. (Salicaeae) from three Swedish isolated populations and one Russian population from the main distribution range of the host. The leaves from the different host clones were used to analyse the content of phenolic glucosides and the amount of condensed tannins. The larvae did not show any feeding preferences for host clones from the population they originated from, but all Swedish host populations were preferred over the Russian host population. This suggests a preference for regional hosts. We analyzed whether leaf chemistry parameters may explain host plant preferences. Chemical analysis of the leaves showed that the quantities, but not the quality, of the phenolic compounds differed between populations. A Principal Component Analysis of the chemical data also highlighted a difference between the Swedish and Russian host plant populations. The two most important compounds separating Russian from Swedish clones were gallocatechin and salidroside. However, the difference in preference could also be a result of, for example, nutritional quality, water content, or leaf texture. The relative importance of these different factors should be evaluated in future experiments.

Place, publisher, year, edition, pages
Amsterdam: North-Holland Pub. Co. , 2005. Vol. 115, no 1, 61-66 p.
Keyword [en]
PCA, local and regional adaptation, herbivory, salidroside, gallocatechin, cafeteria trial, Coleoptera, Chrysomelidae, Salicaceae
URN: urn:nbn:se:umu:diva-5167DOI: 10.1111/j.1570-7458.2005.00269.xOAI: diva2:144574
Available from: 2006-05-11 Created: 2006-05-11 Last updated: 2011-03-24Bibliographically approved
In thesis
1. Spatial patterns in the interaction between Salix triandra and associated parasites
Open this publication in new window or tab >>Spatial patterns in the interaction between Salix triandra and associated parasites
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis focuses on mechanisms and processes underlying spatial patterns of resistance and virulence and on local adaptations in plant–parasite interactions. The model system used comprises the plant host Salix triandra, the pathogenic rust fungus Melampsora amygdalinae, the leaf beetle Gonioctena linnaeana, and the galler Pontania triandrae. In this work, I (1) emphasize the most important factors determining the outcome of a plant–pathogen interaction, and the types of systems in which local adaptations can be expected, (2) examine the resistance structures of different populations of S. triandra, and whether the leaf beetle G. linnaeana responds to the local conditions of the populations of S. triandra in Sweden, and (3) address whether the distribution of parasites on S. triandra can be explained by the plant content of secondary metabolites.

A review of several studies of the subject leads to the conclusion that adaptation of pathogens to their local hosts is more likely to be found in systems in which the pathogen is host-specific, non-systemic, and has a larger dispersal range and evolutionary potential than its host does. Furthermore, the scale of the study must be adjusted to that of the pathogen’s local population distribution. In addition, the temporary nature of host–pathogen interactions influences the importance of sample size, and too-small sample sizes can lower the chance of finding local adaptations, even though they may have evolved in a given system. The results of an inoculation experiment using material from physically isolated natural populations of S. triandra and M. amygdalinae confirm the importance of previous conclusions.

Spatial variation in the resistance structure of S. triandra also has effects on the insect herbivore G. linnaeana, which has responded by adapting to the local hosts. However, local differences in secondary chemistry affect different parasites in different ways, and while P. triandrae is attracted by high levels of phenolic compounds, including tannins, M. amygdalinae and G. linnaeana are more rarely found on plant individuals with high concentrations of tannins. In addition, brood deposition by adult females of G. linnaeana and the performance of larvae are positively affected by luteolin-7-glucoside and an additional unidentified flavonoid, whereas they are negatively affected by the presence of (+)-catechin and high levels of tannins.

Our results also show that plants traits that provide resistance to one type of parasite do not necessarily provide resistance to others. This indicates that different natural enemies potentially assert divergent selection pressure on S. triandra phenotypes which can be important for maintaining phenotypic variation in plant species.

Place, publisher, year, edition, pages
Umeå: Ekologi, miljö och geovetenskap, 2006. 31 p.
Gonioctena linnaeana, host-parasite interactions, leaf beetle, local adaptation, Melampsora amygdalinae, phenolics, pathogens, plant host, secondary chemistry
National Category
urn:nbn:se:umu:diva-798 (URN)91-7264-025-1 (ISBN)
External cooperation:
Public defence
2006-06-09, Stora Hörsalen, KBC, Umeå Universitet, Umeå, 10:00
Available from: 2006-05-11 Created: 2006-05-11 Last updated: 2016-08-26Bibliographically approved

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