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Specialist Leaf Beetles Enrich Diversity of Endophytic Fungi in Aspen Leaves, and Mask Intra-specific Host Specificity
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC). Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. (Benedicte Albrectsen)ORCID-id: 0000-0001-8007-2685
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik.
(engelsk)Manuskript (preprint) (Annet vitenskapelig)
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-126705OAI: oai:DiVA.org:umu-126705DiVA, id: diva2:1034879
Tilgjengelig fra: 2016-10-13 Laget: 2016-10-13 Sist oppdatert: 2018-06-09
Inngår i avhandling
1. Phenolics, Nitrogen, and Biotic Interactions: A Study of Phenylpropanoid Metabolites and Gene Expression in the Leaves of Populus tremula.
Åpne denne publikasjonen i ny fane eller vindu >>Phenolics, Nitrogen, and Biotic Interactions: A Study of Phenylpropanoid Metabolites and Gene Expression in the Leaves of Populus tremula.
2016 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

European aspen (Populus tremula) is a fast growing tree species, rich in phenolic compounds. Defense theories suggest that soil nitrogen greatly influence plant allocation togrowth and defense; however, the allocation priorities are not well understood. Further,although foliar phenolic compounds are considered defensive, specialist organisms may positively associate with and alter them. There are two classes of phenolics in aspen,condensed tannins (CTs) and salicinoids. They are likely to shape the interactions of themany organisms, for example, herbivorous insects and endophytic fungi and three-way interactions among host genotype, specialist herbivores and endophytic fungi could be greatly altered by aspen geno- and chemotypes’ responses to soil nitrogen.

Firstly, I focused on the allocation of carbon to growth and defense in aspen genotypes with varied tannin content in response to nutrient addition. Nitrogen promoted plant growth and suppressed foliar CT levels. At the molecular level expression of genes of the phenylpropanoid pathway (PPP) decreased under low additions of N (equivalent to 15kg/ha), whereas genes at the beginning and at the end of the pathway increased in response to high levels of N (~150 kg/ha). Aspens high in CTs displayed consistently stronger PPP gene expressions compared to CT-low aspens, and correlations between PPP genes and phenolic products varied with tannin content, as an effect of leaf age, in response to N enrichment, and individually with genotype. More negative correlations (indicative of allocation trade-offs) between PPP gene expressions and phenolic products were found in aspen genets with low tannin levels compared to aspens with inherently high tannin levels.

Secondly, I studied the connection between foliar phenolic compounds and endophytic fungi in the presence and absence of a specialist herbivorous beetle (Chrysomela tremula) and as an effect of soil nitrogen addition. Richness and abundance of fungal endophytes associated with aspen genotypes and phenolic profile, however this specificity disappeared in the presence of the leaf beetles. Herbivory both enhanced endophyte richness andabundance in the leaves and it also increased in response to nitrogen addition.

sted, utgiver, år, opplag, sider
Umeå: Umeå University, 2016. s. 31
Emneord
Populus tremula, condensed tannins, salicinoids, phenolics, genetic variation, soil nitrogen fertilization, herbivory
HSV kategori
Forskningsprogram
biologi
Identifikatorer
urn:nbn:se:umu:diva-126699 (URN)978-91-7601-590-2 (ISBN)
Disputas
2016-11-04, KB3B1, KBC-huset, Umeå University, Umeå, 10:00 (engelsk)
Opponent
Veileder
Forskningsfinansiär
Swedish Foundation for Strategic Research , RBb08-0003
Tilgjengelig fra: 2016-10-14 Laget: 2016-10-13 Sist oppdatert: 2018-06-09bibliografisk kontrollert

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