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Plant resistance ecology - the role of resistance in plant-insect mutualisms

Weber, Daniela (2019). Plant resistance ecology - the role of resistance in plant-insect mutualisms. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2019:37
ISBN 978-91-7760-392-4
eISBN 978-91-7760-393-1
[Doctoral thesis]

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Abstract

Global food security is largely dependent on the use of synthetic pesticides for pest control. This extensive reliance on pesticides, however, has promoted widespread loss of insect diversity; thereby jeopardizing the provision of insect ecosystem services like pollination and biological control. For future sustainability, agricultural practices need to shift from pesticide-dependency towards more balanced approaches such as integrated pest management IPM).

Strawberry cultivation is in particular highly pesticide dependent. To protect pollinators, pesticides could be avoided, but reduced pesticide use might promote floral damage by herbivores and lower yields. Indeed, results from this thesis show that in woodland strawberry (Fragaria vesca, L.) floral damage by strawberry leaf beetles (Galerucella spp.) had indirect effects on pollination and direct effects on yield. Pest-damaged flowers yielded smaller fruits, even when pollinated by hand, and were avoided by pollinators. Breeding crop cultivars for pest resistance is a corner stone of IPM and could provide a potential solution to prevent pollination deficits in low-pesticide cultivation.

Crop wild relatives like woodland strawberry are predicted to show high heritable variation in resistance traits useful for crop improvement. Here, wild accessions of woodland strawberry from Sweden were screened for resistance against strawberry leaf beetles. Heritable genetic variation was found for each plant resistance indicator and oviposition was avoided on resistant plant genotypes. Thus wild woodland strawberry can be deemed to offer a promising resource for restoring pest resistance in cultivated strawberry.

However, modifying plant resistance could also affect the herbivore’s natural enemies. Parasitoid performance was in fact strongly affected by herbivore diet source when tested with different wild woodland genotypes. Yet genotype resistance against the parasitoid’s host, the strawberry leaf beetle, did not predict parasitoid survival. Rather, parasitoid survival was explained by plant foliar chemistry, of which levels of carbohydrates appeared to be the most important for parasitism success. These findings underline the need to assess plant-quality effects on biocontrol in plant breeding programs for a synergistic application in
IPM.

Taken together, this work demonstrates that deeper insight into trophic interactions between crop plants, pests, and mutualists (e.g. pollinators and natural enemies) will be crucial in order to design optimal IPM strategies which suppress pests and support mutualists.

Authors/Creators:Weber, Daniela
Title:Plant resistance ecology - the role of resistance in plant-insect mutualisms
Series/Journal:Acta Universitatis Agriculturae Sueciae (1652-6880)
Year of publishing :2019
Volume:2019:37
Number:2019:37
Number of Pages:57
Papers/manuscripts:
NumberReferences
IMuola A, Weber D, Malm LE, Egan PA, Glinwood R, Parachnowitsch AL, Stenberg JA (2017) Direct and pollinator-mediated effects of herbivory on strawberry and the potential for improved resistance. Frontiers in Plant Science 8:823.
IIWeber, D., Egan, P. A., Muola, A., and Stenberg, J. A. (2019). Genetic variation in herbivore resistance within a strawberry crop wild relative (Fragaria vesca L.) (submitted)
IIIWeber, D., Egan, P. A., Muola, A., Ericson, L. E. and Stenberg, J. A. (2019). Plant resistance does not compromise parasitoid-based biocontrol of a strawberry pest. (manuscript)
Place of Publication:Alnarp
Publisher:Swedish University of Agricultural Sciences, Department of Plant Protection Biology,
ISBN for printed version:978-91-7760-392-4
ISBN for electronic version:978-91-7760-393-1
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Article category:Other scientific
Full Text Status:Public
Agris subject categories.:H Protection of plants and stored products > H10 Pests of plants
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Zoology
Keywords:biological control, crop wild relative, florivory, Fragaria vesca, Galerucella, integrated pest management, metabolomic profiling, pollination, tritrophic interactions
URN:NBN:urn:nbn:se:slu:epsilon-p-99649
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-99649
ID Code:16081
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Plant Protection Biology
Deposited By: SLUpub Connector
Deposited On:23 Apr 2019 11:45
Metadata Last Modified:23 Apr 2019 14:28

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