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Tolerance to apical and leaf damage of Raphanus raphanistrum in different competitive regimes
Södertörn University, School of Natural Sciences, Technology and Environmental Studies. Swedish Environm Protect Agcy.
Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Environmental Science.ORCID iD: 0000-0002-0260-3978
2015 (English)In: Ecology and Evolution, ISSN 2045-7758, E-ISSN 2045-7758, Vol. 5, no 22, 5193-5202 p.Article in journal (Refereed) Published
Abstract [en]

Tolerance to herbivory is an adaptation that promotes regrowth and maintains fitness in plants after herbivore damage. Here, we hypothesized that the effect of competition on tolerance can be different for different genotypes within a species and we tested how tolerance is affected by competitive regime and damage type. We inflicted apical or leaf damage in siblings of 29 families of an annual plant Raphanus raphanistrum (Brassicaceae) grown at high or low competition. There was a negative correlation of family tolerance levels between competition treatments: plant families with high tolerance to apical damage in the low competition treatment had low tolerance to apical damage in the high competition treatment and vice versa. We found no costs of tolerance, in terms of a trade-off between tolerance to apical and leaf damage or between tolerance and competitive ability, or an allocation cost in terms of reduced fitness of highly tolerant families in the undamaged state. High tolerance bound to a specific competitive regime may entail a cost in terms of low tolerance if competitive regime changes. This could act as a factor maintaining genetic variation for tolerance.

Place, publisher, year, edition, pages
2015. Vol. 5, no 22, 5193-5202 p.
Keyword [en]
Cost of tolerance; crucifers; herbivory; plant competition; trade-off
National Category
Environmental Sciences
Research subject
Environmental Studies; Baltic and East European studies
Identifiers
URN: urn:nbn:se:sh:diva-16092DOI: 10.1002/ece3.1759ISI: 000365761200004OAI: oai:DiVA.org:sh-16092DiVA: diva2:517001
Funder
Swedish Research CouncilThe Foundation for Baltic and East European Studies
Note

Som manuskript i avhandling. As manuscript in dissertation.

Available from: 2008-09-04 Created: 2012-04-20 Last updated: 2016-09-29Bibliographically approved
In thesis
1. Ecology and evolution of tolerance in two cruciferous species
Open this publication in new window or tab >>Ecology and evolution of tolerance in two cruciferous species
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Tolerance to herbivory is the ability of plants to maintain fitness in spite of damage. The goal of this thesis is to investigate the genetic variation and expression of tolerance within species, determine whether and in what conditions tolerance has negative side-effects, and how tolerance is affected by different ecological factors. Tolerance is investigated with special focus on the effects of different damage types, competitive regimes, history of herbivory, and polyploidization in plants. Studies are conducted as a literature review and three experiments on two cruciferous species Raphanus raphanistrum and Cardamine pratensis.

In the tolerance experiments, plants are subjected to artificial damage solely, or in a combination with natural damage. A literature review was conducted in order to investigate the effects of damage method. We found that traits related to tolerance, such as growth and fitness were not as sensitive in regard to damage method as measures of induced chemical traits, or measures of secondary herbivory.

Genetic variation of tolerance was demonstrated within populations of R. raphanistrum and between subspecies of C. pratensis. In R. raphanistrum, traits involved in floral display and male fitness were positively associated with plant tolerance to herbivore damage. A potential cost of tolerance was demonstrated as a negative correlation between levels of tolerance in high and low competitive regimes. I found no evidence of other proposed costs of tolerance in terms of highly tolerant plants suffering of reduced fitness in the absence of herbivores or trade-offs in terms of a negative association between tolerance to apical and leaf damage, or between tolerance and competitive ability. In C. pratensis, higher ploidy level in plants involved higher levels of tolerance measured as clonal reproduction. Furthermore, populations exposed to higher levels of herbivory had better tolerance than populations exposed to lower levels of herbivory. In this thesis, I demonstrate evidence of different components for the evolution of tolerance in plants: genotypic variation, selective factors in terms of costs and ploidization, and selective agents in terms of changing environment or herbivore pressure.

Place, publisher, year, edition, pages
Stockholm: Botaniska institutionen, 2008. 34 p.
Series
Södertörn Doctoral Dissertations, ISSN 1652-7399 ; 29
Keyword
herbivory, tolerance, methodology, Raphanus raphanistrum, Cardamine pratensis, folivory, apex removal, plant competition, ploidy levels, herbivore pressure
National Category
Other Biological Topics
Research subject
Plant Ecology
Identifiers
urn:nbn:se:sh:diva-16090 (URN)978-91-7155-717-9 (ISBN)
Public defence
2008-09-26, föreläsningssalen, Botanicum, Lilla Frescativägen 5, 13:00
Opponent
Supervisors
Available from: 2012-04-20 Created: 2012-04-20 Last updated: 2012-04-20Bibliographically approved

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