Hadaček, Franz

[["dc.bibliographiccitation.artnumber","138"],["dc.bibliographiccitation.journal","Frontiers in Ecology and Evolution"],["dc.bibliographiccitation.volume","5"],["dc.contributor.author","Drage, Sigrid"],["dc.contributor.author","Mitter, Birgit"],["dc.contributor.author","Engelmeier, Doris"],["dc.contributor.author","Chobot, Vladimir"],["dc.contributor.author","Gorfer, Markus"],["dc.contributor.author","Muchugi, Alice"],["dc.contributor.author","Jamnadass, Ramni H."],["dc.contributor.author","Sessitsch, Angela"],["dc.contributor.author","Hadacek, Franz"],["dc.date.accessioned","2019-07-09T11:44:42Z"],["dc.date.available","2019-07-09T11:44:42Z"],["dc.date.issued","2017"],["dc.description.abstract","The African pepper bark tree,Warburgia ugandensis, accumulates antimicrobial drimane sesquiterpenes in all of its organs. One hypothesis states that plant defense compounds determine endophyte community structure. Another hypothesis suggests that they just facilitate the endophytic lifestyle by exerting a balanced antagonism. To explore this, a representative selection of endophytic bacterial and fungal isolates from this tree species was assayed together with six non-endophytic strains to determine their tolerance and susceptibility to the root and leaf extract fraction containing high and low drimane sesquiterpene amounts respectively. Inhibitory effects were explored by assessing both growth and growth efficiency, the latter of which relates respiratory activity to growth. The susceptibility of the tested strains showed considerable variation and the obtained patterns did not allow a clear distinction between root and leaf endophytes as well as endophytes and non-endophytes. In addition, all strains were also assayed against juglone, an antimicrobial and redox-active aromatic naphthoquinone. A comparison of differential pulse voltammograms and efficacy in variants of the deoxyribose degradation assay revealed that drimane sesquiterpenes possess anti- and pro-oxidant activities that compare to those of juglone. Leaf endophytes showed higher resistance to oxidative stress than root endophytes, quite contrary to the actual exposure. The obtained results support the notion that structural diverse plant defense compounds can contribute to a balanced antagonismagainst but not to structuring of endophyte communities. Oxidative stress seems to be involved in generating this effect albeit it cannot explain it alone."],["dc.identifier.doi","10.3389/fevo.2017.00138"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14872"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/59072"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.publisher","Frontiers Media S.A."],["dc.relation.eissn","2296-701X"],["dc.relation.issn","2296-701X"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.subject.ddc","570"],["dc.title","Antimicrobial Drimane Sesquiterpenes Contribute to Balanced Antagonism but Do Not Structure Bacterial and Fungal Endophytes in the African Pepper Bark Tree Warburgia ugandensis"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","13"],["dc.bibliographiccitation.journal","Frontiers in Microbiology"],["dc.bibliographiccitation.volume","5"],["dc.contributor.author","Drage, Sigrid"],["dc.contributor.author","Mitter, Birgit"],["dc.contributor.author","Troels, Christina"],["dc.contributor.author","Muchugi, Alice"],["dc.contributor.author","Jamnadass, Ramni H."],["dc.contributor.author","Sessitsch, Angela"],["dc.contributor.author","Hadacek, Franz"],["dc.date.accessioned","2018-11-07T09:43:49Z"],["dc.date.available","2018-11-07T09:43:49Z"],["dc.date.issued","2014"],["dc.description.abstract","Metabolite profiles (GC MS), drimane sesquiterpenes, sugars and sugar alcohols, were compared with bacterial and fungal endophyte communities (T-RFLP, DNA clones, qPCR) in leaves and roots of the pepper bark tree, Warburgia ugandensis (Canellaceae). Ten individuals each were assessed from two locations east and west of the Great Rift Valley, Kenya, Africa, which differed in humidity and vegetation, closed forest versus open savannah. Despite organ- and partially site-specific variation of drimane sesquiterpenes, no clear effects on bacterial and fungal endophyte communities could be detected. The former were dominated by gram-negative Gammaproteobacteria, Pseudomonadaceae and Enterobacteriaceae, as well as gram-positive Firmicutes; the fungal endophyte communities were more diverse but no specific groups dominated. Despite initial expectations, the endophyte community of the pepper bark tree did not differ from other trees that much."],["dc.description.sponsorship","FWF (Austrian Science Foundation) [P19852-B17]"],["dc.identifier.doi","10.3389/fmicb.2014.00013"],["dc.identifier.isi","000331788100001"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/11792"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/34264"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Frontiers Media Sa"],["dc.relation.issn","1664-302X"],["dc.rights","CC BY 3.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/3.0"],["dc.title","Antimicrobial drimane sesquiterpenes and their effect on endophyte communities in the medical tree Warburgia ugandensis"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]