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dc.contributor.advisor Jousset, Alexandre Dr.
dc.contributor.author Latz, Ellen
dc.date.accessioned 2015-09-01T09:43:18Z
dc.date.available 2015-09-01T09:43:18Z
dc.date.issued 2015-09-01
dc.identifier.uri http://hdl.handle.net/11858/00-1735-0000-0022-608E-7
dc.language.iso eng de
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject.ddc 570 de
dc.title Unravelling mechanisms linking plant diversity to plant-disease suppression de
dc.type doctoralThesis de
dc.contributor.referee Scheu, Stefan Prof. Dr.
dc.date.examination 2015-06-05
dc.description.abstracteng The use of microbes for biological control of plant diseases represents an environmentally friendly and promising approach. Plant diversity is known to increase numerous ecosystem functions and also increases the resistance of soils to pathogens by increasing the abundance of essential microbes. However, to effectively antagonize soil-borne pathogens, bacteria not only need to produce antibiotics in sufficient amounts, but also need to successfully compete for nutrients and niches on the root surface, and escape predation. However, the extent to which each of those parameters impacts rhizosphere microbial functioning is not fully understood. This thesis aimed at a mechanistic understanding of the effect of plant diversity and plant community structure on the abundance and activity of soil bacteria responsible for soil-borne plant disease suppression. First, I analyzed whether plant diversity per se or plant functional group affiliation, plant identity or interaction effects are the main drivers of biocontrol bacteria and their activity in producing antifungal compounds. Second, I investigated abiotic factors and protozoan predation as mediators of plant community composition effects on plant-disease suppression. Results of this thesis proved biocontrol bacteria in addition to abiotic soil parameters to be important determinants of pathogen suppression. The results underline the role of plant diversity in driving soil disease suppression, but further indicate that plant diversity (and functional group) effects are mediated by specific plant identity and plant-plant interaction effects. Moreover, the results underline the assumption that plant community composition, soil abiotic properties and microbial communities being antagonistic to soil pathogens are linked and interactively shape the suppressive potential of soils. Results of this thesis represent an important step in unravelling the complexity of mechanisms linking plant community composition to plant disease suppression. Choosing specific plant communities may enable to manipulate rhizosphere environmental conditions, thereby fostering microbial establishment in the rhizosphere and increase the disease suppressive potential of soils. de
dc.contributor.coReferee Brose, Ulrich Prof. Dr.
dc.subject.eng Biological control de
dc.subject.eng Pseudomonas fluorescens de
dc.subject.eng Structural Equation Modelling de
dc.subject.eng Soil-borne pathogen de
dc.subject.eng Rhizoctonia solani de
dc.subject.eng Grassland de
dc.subject.eng Soil suppressiveness de
dc.subject.eng BEF de
dc.subject.eng phlA de
dc.subject.eng prnA de
dc.subject.eng hcnA de
dc.subject.eng Actinomyces de
dc.subject.eng Bacillus de
dc.subject.eng Biodiversity de
dc.subject.eng Plant diversity de
dc.subject.eng Ecosystem functioning de
dc.subject.eng Biocontrol de
dc.identifier.urn urn:nbn:de:gbv:7-11858/00-1735-0000-0022-608E-7-9
dc.affiliation.institute Biologische Fakultät für Biologie und Psychologie de
dc.subject.gokfull Biologie (PPN619462639) de
dc.identifier.ppn 834273802

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