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Trichome production and spatiotemporal variation in herbivory in the perennial herb Arabidopsis lyrata
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Ecological Botany.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Ecological Botany.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Ecological Botany.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Ecological Botany.
2007 (English)In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 116, no 1, 134-142 p.Article in journal (Refereed) Published
Abstract [en]

Allocation theory suggests that the optimal level of resistance against herbivores should vary with the risk of herbivory if allocation to resistance is costly. The perennial herb Arabidopsis lyrata has a genetically based polymorphism for- trichome production and occurs in a glabrous and a trichome-producing form. Leaf trichomes (hairs) can protect plants against insect herbivores, and may increase tolerance to drought and UV-radiation. To examine the functional significance of trichome production, we documented the frequency of glabrous plants and damage by insect herbivores in 30 A. lyrata populations in Sweden and Norway. The proportion of glabrous plants ranged from 0.10 to 0.71 (median = 0.44) in polymorphic populations; 7 of 12 populations in Norway and 14 of 18 populations in Sweden were monomorphic glabrous, i.e. with fewer than 5% trichome-producing plants. The mean proportion of the leaf area removed by herbivores varied substantially among populations and years. With few exceptions, glabrous plants were more damaged than trichome-producing plants in polymorphic populations. The intensity of herbivory quantified as the mean damage to glabrous plants tended to be higher in polymorphic populations than in populations monomorphic for the glabrous morph and was higher in Sweden than in Norway. In Norway, both the magnitude of herbivore damage and the frequency of trichome-producing plants tended to decrease with increasing altitude. The results indicate that leaf trichomes contribute to resistance against herbivorous insects in A. lyrata, and suggest that herbivore-mediated selection contributes to the maintenance of the polymorphism in trichome production.

Place, publisher, year, edition, pages
2007. Vol. 116, no 1, 134-142 p.
Keyword [en]
Spermatophyta, Angiospermae, Dicotyledones, Cruciferae, Arabidopsis, Herbivorous, Time variation, Spatial variation, Trichome
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-94036DOI: 10.1111/j.2006.0030-1299.15022.xISI: 000243413600013OAI: oai:DiVA.org:uu-94036DiVA: diva2:167729
Available from: 2006-03-03 Created: 2006-03-03 Last updated: 2017-12-14
In thesis
1. Ecology and Evolution of Resistance to Herbivory: Trichome Production in Arabidopsis lyrata
Open this publication in new window or tab >>Ecology and Evolution of Resistance to Herbivory: Trichome Production in Arabidopsis lyrata
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, I examine variation in occurrence and performance of glabrous and trichome-producing plants of the perennial herb Arabidopsis lyrata. I combine field studies and genetic analysis to (1) examine the function of trichomes as a resistance character in natural populations, (2) compare the magnitude of population differentiation in trichome-production and at putatively neutral marker loci, (3) examine the molecular genetic basis of trichome-production, and (4) quantify the effects of herbivore removal on population growth and relative performance of glabrous and trichome-producing plants.

In a survey of 30 populations of A. lyrata in Norway and Sweden, I documented spatiotemporal variation in damage from insect herbivores. With few exceptions, glabrous plants were more damaged by herbivorous insects than trichome-producing plants in polymorphic populations. Damage levels varied substantially among populations and among years. The intensity of herbivory quantified as mean leaf removal to glabrous plants was higher in polymorphic populations than in monomorphic glabrous populations.

Within the Swedish range, populations were more strongly differentiated at the locus coding for glabrousness than at eight putatively neutral isozyme loci. This is consistent with the hypothesis that trichome production is subject to divergent selection.

A study of the genetic basis of trichome production showed that glabrousness was associated with mutations in an orthologue to GLABROUS1, a regulatory gene known to cause glabrousness in A. thaliana. Comparative data indicate that the genetic basis of glabrousness varies among populations.

Experimental removal of insect herbivores in a natural A. lyrata population increased population growth rate and the relative fitness of the glabrous morph. The results suggest that insect herbivory may influence both population dynamics and selection on trichome production in A. lyrata.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. 32 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 148
Keyword
Biology, Plant-animal interactions, herbivory, trichomes, plant resistance, plant defense, divergent selection, local adaptation, GLABROUS1, evolution, matrix population models, LTRE, Biologi
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-6359 (URN)91-554-6467-X (ISBN)
Public defence
2006-03-25, Föreläsningssalen, Avdelningen för växtekologi, Villavägen 14, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2006-03-03 Created: 2006-03-03 Last updated: 2011-02-17Bibliographically approved

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Løe, GeirToräng, PerÅgren, Jon

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