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Trichome production and variation in young plant resistance to the specialist insect herbivore Plutella xylostella among natural populations of Arabidopsis lyrata
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Plant Ecology and Evolution.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Plant Ecology and Evolution.
2013 (English)In: Entomologia Experimentalis et Applicata, ISSN 0013-8703, E-ISSN 1570-7458, Vol. 149, no 2, 166-176 p.Article in journal (Refereed) Published
Abstract [en]

The strength of plant-herbivore interactions varies spatially and through plant ontogeny, which may result in variable selection on plant defenses against herbivory both among populations and among different life-history stages. The perennial herb Arabidopsis lyrata occurs in a trichome-producing and a glabrous morph, and previous work has shown that glabrous plants tend to receive more damage than trichome-producing plants. In this study, we quantified oviposition preference and larval feeding by P. xylostella on very young A. lyrata (5-6 weeks old), originating from twelve natural populations, six from Sweden and six from Norway. Six of the populations (three from each region) were polymorphic for trichome production and allowed a comparison of resistance against P. xylostella between the glabrous and the trichome-producing morph at a stage when trichome density is low in trichome-producing plants. There was considerable variation among populations in the number of eggs received and the proportion of leaf area consumed, but not between regions (Sweden and Norway) or trichome morphs. Rosette size explained a significant portion of the variation in oviposition and larval feeding. The results demonstrate that among-population variation in resistance to insect herbivory can also be detected among very young individuals of the perennial herb A. lyrata. They further suggest that trichome densities are too low at this developmental stage to contribute to resistance, and that the observed among-population variation in resistance is related to differences in other plant traits.

Place, publisher, year, edition, pages
2013. Vol. 149, no 2, 166-176 p.
Keyword [en]
oviposition, larval feeding, ontogeny, plant defense, trichome density
National Category
Ecology
Research subject
Biology with specialization in Ecological Botany
Identifiers
URN: urn:nbn:se:uu:diva-183429DOI: 10.1111/eea.12120ISI: 000325356200008OAI: oai:DiVA.org:uu-183429DiVA: diva2:564529
Available from: 2012-11-01 Created: 2012-10-25 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Plant-Herbivore Interactions and Evolutionary Potential of Natural Arabidopsis lyrata Populations
Open this publication in new window or tab >>Plant-Herbivore Interactions and Evolutionary Potential of Natural Arabidopsis lyrata Populations
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, I combined field, greenhouse and common-garden experiments to examine the ecological and evolutionary consequences of plant-herbivore interactions and the genetic architecture of fitness-related traits in the insect-pollinated, self-incompatible, perennial herb Arabidopsis lyrata. More specifically, I examined (1) whether damage to leaves and inflorescences affects plant fitness non-additively, (2) whether trichome production is associated with a cost in terms of reduced tolerance to leaf and inflorescence damage, (3) whether young plant resistance to a specialist insect herbivore varies among populations, and (4) whether the evolution of flowering time, floral display and rosette size is constrained by lack of genetic variation or by genetic correlations among traits.

A two-year field experiment in a Swedish population showed that damage to rosette leaves and to inflorescences can affect both current and future plant performance of A. lyrata, and that effects on some fitness components are non-additive. A two-year field experiment in another Swedish population indicated that trichome-producing plants are not less tolerant than glabrous plants to leaf and inflorescence damage. In a greenhouse experiment, acceptability of young plants (5-6 weeks old) to ovipositing females and damage received by Plutella xylostella larvae varied considerably among twelve A. lyrata populations. Both oviposition and leaf damage were positively correlated with rosette size, but trichome density in the trichome-producing morph was apparently too low at this developmental stage to influence resistance to P. xylostella. In a common-garden experiment, flowering time, floral display and rosette size varied among four Scandinavian A. lyrata populations, and displayed significant additive genetic variation in some populations. Yet, strong genetic correlations between flowering start and number of flowers, and between petal length and petal width suggest that these traits may not evolve independently.

Taken together, the results indicate the need to consider possible long-term and non-additive effects of herbivore damage to different plant parts, that there is no trade-off between trichome production and tolerance to herbivory, that the importance of morphological defenses against herbivory may change through plant ontogeny, and that considerable genetic variation for traits such as flowering time and floral display can be maintained in natural plant populations.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2012. 47 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 996
Keyword
plant defenses, leaf herbivory, floral herbivory, ontogeny, G-matrix, trade-offs
National Category
Ecology Evolutionary Biology
Research subject
Biology with specialization in Ecological Botany; Biology with specialization in Evolutionary Genetics
Identifiers
urn:nbn:se:uu:diva-183433 (URN)978-91-554-8535-1 (ISBN)
Public defence
2012-12-15, Lindahlsalen, Norbyvägen 18A, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2012-11-23 Created: 2012-10-25 Last updated: 2013-02-11Bibliographically approved

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Puentes, AdrianaÅgren, Jon

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