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Additive and non-additive effects of simulated leaf and inflorescence damage on survival, growth and reproduction of the perennial herb 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.
2012 (English)In: Oecologia, ISSN 0029-8549, E-ISSN 1432-1939, Vol. 169, no 4, 1033-1042 p.Article in journal (Refereed) Published
Abstract [en]

Herbivores may damage both leaves and reproductive structures, and although such combined damage may affect plant fitness non-additively, this has received little attention. We conducted a 2-year field experiment with a factorial design to examine the effects of simulated leaf (0,12.5, 25, or 50% of leaf area removed) and inflorescence damage (0 vs. 50% of inflorescences removed) on survival, growth and reproduction in the perennial herb Arabidopsis lyrata. Leaf and inflorescence damage negatively and independently reduced flower, fruit and seed production in the year of damage; leaf damage also reduced rosette size by the end of the first season and flower production in the second year. Leaf damage alone reduced the proportion of flowers forming a fruit and fruit production per plant the second year, but when combined with inflorescence damage no such effect was observed (significant leaf × inflorescence damage interaction). Damage to leaves (sources) caused a greater reduction in future reproduction than did simultaneous damage to leaves and inflorescences (sinks). This demonstrates that a full understanding of the effects of herbivore damage on plant fitness requires that consequences of damage to vegetative and reproductive structures are evaluated over more than 1 year and that non-additive effects are considered.

Place, publisher, year, edition, pages
2012. Vol. 169, no 4, 1033-1042 p.
Keyword [en]
leaf herbivory, floral herbivory, artificial damage, plant fitness, interactions
National Category
Ecology
Research subject
Biology with specialization in Ecological Botany
Identifiers
URN: urn:nbn:se:uu:diva-183432DOI: 10.1007/s00442-012-2276-1ISI: 000306494800017PubMedID: 22349755OAI: oai:DiVA.org:uu-183432DiVA: diva2:564531
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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