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Diversity of wheat phyllosphere fungi in different agricultural production systems

with special reference to Fusarium

Karlsson, Ida (2015). Diversity of wheat phyllosphere fungi in different agricultural production systems. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2015:88
ISBN 978-91-576-8374-8
eISBN 978-91-576-8375-5
[Doctoral thesis]

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Abstract

Fusarium head blight (FHB) is a disease affecting cereals world-wide caused by Fusarium fungi. The disease is of great economic importance especially since it is associated with contamination by harmful mycotoxins produced by Fusarium spp. In recent years, several studies have reported lower mycotoxin contamination of organically produced cereals compared with those produced conventionally. An unexplored factor is differences in the microbial communities on cereal crops between the organic and conventional systems, which may exert a biocontrol effect on FHB. The aim of this thesis was to investigate the effect of different environmental and agricultural factors on Fusarium communities and fungal phyllosphere communities in wheat in different agricultural production systems.

New primers for amplifying Fusarium communities, in conjunction with 454 se-quencing, were evaluated, and Fusarium communities associated with soil and wheat kernels were successfully characterised. Comparison of fungicide-treated and untreated wheat leaves from 18 fields in Sweden in 2011 revealed that fungicide use was associ-ated with decreased evenness of fungal communities. Furthermore, organic farming was associated with increased fungal species richness on wheat leaves when pairs of 22 organically and conventionally managed fields in Sweden were compared in 2012. There was no difference in the abundance of leaf pathogens between cropping systems. Several fungal species were consistently found regardless of geographical location, year and cropping system, while fungal abundance was highly variable between fields. Both Fusarium and fungal communities were affected by agricultural intensity. How-ever, there was no difference in Fusarium community composition in wheat kernels from organically and conventionally managed fields. The method evaluated in this thesis can be used to monitor Fusarium communities in the field, which is important in order to develop strategies for limiting FHB and mycotoxin contamination. The present thesis demonstrates that fungicide use and organic farming are associated with differen-tial fungal communities in the wheat phyllosphere. This indicates that there is an oppor-tunity for the farmer to manage these communities with the aim of enhancing their biocontrol potential against plant pathogens such as Fusarium.

Authors/Creators:Karlsson, Ida
Title:Diversity of wheat phyllosphere fungi in different agricultural production systems
Subtitle:with special reference to Fusarium
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2015
Depositing date:4 September 2015
Volume:2015:88
Number of Pages:72
Papers/manuscripts:
NumberReferences
IKarlsson I., Edel-Hermann V., Gautheron N., Brandström Durling M., Kolseth A-K., Steinberg C., Persson P., Friberg H. Evaluation of genus-specific primers for studying Fusarium communities in field samples. (manuscript)
IIKarlsson I., Friberg H., Steinberg C., Persson P. (2014). Fungicide effects on fungal community composition in the wheat phyllosphere. PLoS ONE 9(11), e111786.
IIIKarlsson I., Friberg H., Steinberg C., Kolseth A-K, Persson P. Organic farming increases fungal species richness in the wheat phyllosphere. (manuscript)
IVKarlsson I., Friberg H., Steinberg C., Kolseth A-K, Persson P. Factors affecting Fusarium community composition in wheat kernels. (manuscript)
Place of Publication:Uppsala
Publisher:Department of Crop Production Ecology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8374-8
ISBN for electronic version:978-91-576-8375-5
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F08 Cropping patterns and systems
F Plant production > F40 Plant ecology
H Protection of plants and stored products > H20 Plant diseases
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Microbiology (Microbiology in the medical area to be 30109)
(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
Agrovoc terms:wheats, triticum, fungi, fusarium, blight, phyllosphere, biodiversity, alternative agriculture, fungicides, microorganisms, microbial ecology
Keywords:Fusarium head blight, phyllosphere, leaves, winter wheat, fungi, organic farming, fungicides, biodiversity, microbial communities, high-throughput sequencing
URN:NBN:urn:nbn:se:slu:epsilon-e-2894
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2894
ID Code:12536
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Crop Production Ecology
External funders:FORMAS and Knut and Alice Wallenberg Foundation
Deposited By: Ida Karlsson
Deposited On:03 Sep 2015 07:48
Metadata Last Modified:18 Dec 2015 11:04

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