Plant-Herbivore Interactions and Evolutionary Potential of Natural Arabidopsis lyrata Populations

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Plant-Herbivore Interactions and Evolutionary Potential of Natural Arabidopsis lyrata Populations

Puentes, Adriana, 1982- (author): Uppsala universitet,Växtekologi och evolution

Ågren, Jon, Professor (thesis advisor): Uppsala universitet,Växtekologi och evolution

Hagenblad, Jenny, Dr. (thesis advisor): Institutionen för fysik, kemi och biologi, Linköping Universitet

Leimu Brown, Roosa, Dr. (opponent): Department of Plant Sciences, University of Oxford

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(creator_code:org_t)

ISBN 9789155485351
Uppsala : Acta Universitatis Upsaliensis, 2012
English 47 s.
Series: Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 ; 996

Related links:: https://uu.diva-port... (primary) (Raw object); show more...; https://urn.kb.se/re...; show less...

Doctoral thesis (other academic/artistic)

Abstract Subject headings

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.

Subject headings

NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
NATURVETENSKAP -- Biologi -- Evolutionsbiologi (hsv//swe)
NATURAL SCIENCES -- Biological Sciences -- Evolutionary Biology (hsv//eng)

Keyword

plant defenses
leaf herbivory
floral herbivory
ontogeny
G-matrix
trade-offs
Biology with specialization in Ecological Botany
Biologi med inriktning mot ekologisk botanik
Biology with specialization in Evolutionary Genetics
Biologi med inriktning mot evolutionär genetik

Publication and Content Type

vet (subject category)
dok (subject category)

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