Hadaček, Franz

[["dc.bibliographiccitation.firstpage","763"],["dc.bibliographiccitation.issue","11-12"],["dc.bibliographiccitation.journal","Journal of Phytopathology"],["dc.bibliographiccitation.lastpage","773"],["dc.bibliographiccitation.volume","161"],["dc.contributor.author","Hage-Ahmed, Karin"],["dc.contributor.author","Moyses, Anna"],["dc.contributor.author","Voglgruber, Andreas"],["dc.contributor.author","Hadacek, Franz"],["dc.contributor.author","Steinkellner, Siegrid"],["dc.date.accessioned","2018-11-07T09:16:46Z"],["dc.date.available","2018-11-07T09:16:46Z"],["dc.date.issued","2013"],["dc.description.abstract","Arbuscular mycorrhizal fungi (AMF) can control soilborne diseases such as Fusarium oxysporum f.sp. lycopersici (Fol). Root exudates play an important role in plant-microbe interactions in the rhizosphere, especially, in the initial phase of these interactions. In this work, we focus on (i) elucidating dynamics in root exudation of Solanum lycopersicum L. in an intercropping system due to AMF and/or Fol; (ii) its effect on Fol development in vitro; and (iii) the testing of the root exudate compounds identified in the chromatographic analyses in terms of effects on fungal growth in in vitro assays. GC-MS analyses revealed an AMF-dependent increase in sugars and decrease in organic acids, mainly glucose and malate. In the HPLC analyses, an increase in chlorogenic acid was evident in the combined treatment of AMF and Fol, which is to our knowledge the first report about an increase in chlorogenic acid in root exudates of AM plants challenged with Fol compared with plants inoculated with AMF only, clearly indicating changes in root exudation due to AMF and Fol. Root exudates of AMF tomato plants stimulate the germination rate of Fol, whereas the co-inoculation of AMF and Fol leads to a reduction in spore germination. In the in vitro assays, citrate and chlorogenic acid could be identified as possible candidates for the reduction in Fol germination rate in the root exudates of the AMF+Fol treatment because they proved inhibition at concentrations naturally occurring in the rhizosphere."],["dc.description.sponsorship","Austrian Science Fund (FWF) [P20923-B17]"],["dc.identifier.doi","10.1111/jph.12130"],["dc.identifier.isi","000330107700002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28010"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1439-0434"],["dc.relation.issn","0931-1785"],["dc.title","Alterations in Root Exudation of Intercropped Tomato Mediated by the Arbuscular Mycorrhizal Fungus Glomus mosseae and the Soilborne Pathogen Fusarium oxysporum f. sp lycopersici"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","151"],["dc.bibliographiccitation.journal","Environmental and Experimental Botany"],["dc.bibliographiccitation.lastpage","160"],["dc.bibliographiccitation.volume","109"],["dc.contributor.author","Tewari, Rajesh Kumar"],["dc.contributor.author","Bachmann, Gert"],["dc.contributor.author","Hadacek, Franz"],["dc.date.accessioned","2018-11-07T10:04:18Z"],["dc.date.available","2018-11-07T10:04:18Z"],["dc.date.issued","2015"],["dc.description.abstract","The alkaloid 8-hydroxyquinoline (HQ) was pointed out as potential phytosiderophore that is taken up unspecifically by iron acquisition strategy I and II plants. HQ in root exudate of the knapweed Centaurea diffusa even was considered as a factor contributing to the invasive success of this species. This study compares the iron supply efficiencies of the Fe-HQ complex and Fe-EDTA in hydroponic cultures of rapeseed (Brassica napus) as a plant model system to explore the proposed function. Iron (FeCl3) was supplied in 2 and 10 mu M concentrations in a 1:1 ratio with the ligand (HQ). After 20 days, Fe content, lipid peroxidation, superoxide anion, hydrogen peroxide, and ascorbic acid concentrations, various enzyme activities associated with antioxidant defences and programmed cell death (PCD), and nuclear condensation were determined. Iron supply in the form of a Fe-HQ complex clearly was less efficient. These plants developed chlorosis and showed symptoms of non-autolytic PCD similar to those that had been subjected to Fe deprivation. Reactive oxygen species (ROS) concentration levels and enzyme activities (superoxide dismutase, catalase, alkaline protease, caspase-3-like and deoxyribonuclease) resembled more those observed in plants which suffered from Fe deprivation, than those of Fe-sufficient Fe-EDTA supplied plants. The results do not support the putative phytosiderophore function alleged to HQ in the studied concentration range (2-10 mu M) but instead corroborate the one hypothesis explaining HQ toxicity: Fe in complex with HQ is not released efficiently enough from the complex to be available for metalloenzymes that require it as a co-factor. (C) 2014 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.envexpbot.2014.07.016"],["dc.identifier.isi","000345478000018"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38665"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","1873-7307"],["dc.relation.issn","0098-8472"],["dc.title","Iron in complex with the alleged phytosiderophore 8-hydroxyquinoline induces functional iron deficiency and non-autolytic programmed cell death in rapeseed plants"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","103"],["dc.bibliographiccitation.journal","Journal of Organometallic Chemistry"],["dc.bibliographiccitation.lastpage","110"],["dc.bibliographiccitation.volume","782"],["dc.contributor.author","Chobot, Vladimir"],["dc.contributor.author","Hadacek, Franz"],["dc.contributor.author","Weckwerth, Wolfram"],["dc.contributor.author","Kubicova, Lenka"],["dc.date.accessioned","2018-11-07T09:58:30Z"],["dc.date.available","2018-11-07T09:58:30Z"],["dc.date.issued","2015"],["dc.description.abstract","Anthranilic acid (ANA) and 3-hydroxyanthranilic acid (3-HANA) are kynurenine pathway intermediates of the tryptophan metabolism. A hitherto unemployed method combination, differential pulse voltammetry, mass spectrometry (nano-ESI MS), deoxyribose degradation and iron(II) autoxidation assays has been employed for studying of their redox chemistry and their interactions with iron(II) and iron(III) ions. Both acids inhibited the Fenton reaction by iron chelation and ROS scavenging in the deoxyribose degradation assay. In the iron(II) autoxidation assay, anthranilic acid showed antioxidant effects, whereas 3-hydroxyanthranilic acid exhibited apparent pro-oxidant activity. The differential pulse voltammograms of free metabolites and their iron(II) coordination complexes reflected these properties. Nano-ESI MS confirmed ANA and 3-HANA as efficient iron(II) chelators, both of which form coordination complexes of ligand:iron(II) ratio 1:1, 2:1, and 3:1. In addition, nano-ESI MS analyses of the oxidation effects by hydroxyl radical attack identified 3-HANA as strikingly more susceptible than ANA. 3-HANA susceptibility to oxidation may explain its decreased concentrations in the reaction mixture. The presented observations can add to explaining why 3-HANA levels decrease in patients with some neurological and other diseases which can often associated with elevated concentrations of ROS. (C) 2015 The Authors. Published by Elsevier B.V."],["dc.description.sponsorship","Austrian Science Fund (FWF) [P24630-B21]"],["dc.identifier.doi","10.1016/j.jorganchem.2015.01.005"],["dc.identifier.isi","000351637900016"],["dc.identifier.pmid","25892823"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37375"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Sa"],["dc.publisher.place","Lausanne"],["dc.relation.conference","7th International Symposium on Bioorganometallic Chemistry"],["dc.relation.eventlocation","Vienna, AUSTRIA"],["dc.relation.issn","1872-8561"],["dc.relation.issn","0022-328X"],["dc.title","Iron chelation and redox chemistry of anthranilic acid and 3-hydroxyanthranilic acid: A comparison of two structurally related kynurenine pathway metabolites to obtain improved insights into their potential role in neurological disease development"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Heredity"],["dc.bibliographiccitation.lastpage","14"],["dc.bibliographiccitation.volume","125"],["dc.contributor.author","Hörandl, Elvira"],["dc.contributor.author","Hadacek, Franz"],["dc.date.accessioned","2020-12-10T18:09:44Z"],["dc.date.available","2020-12-10T18:09:44Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1038/s41437-020-0317-9"],["dc.identifier.eissn","1365-2540"],["dc.identifier.issn","0018-067X"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/73741"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Oxygen, life forms, and the evolution of sexes in multicellular eukaryotes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]