Pena, Rodica

[["dc.bibliographiccitation.firstpage","879"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Functional Plant Biology"],["dc.bibliographiccitation.lastpage","889"],["dc.bibliographiccitation.volume","37"],["dc.contributor.author","Winkler, Jana B."],["dc.contributor.author","Dannenmann, Michael"],["dc.contributor.author","Simon, Judy"],["dc.contributor.author","Pena, Rodica"],["dc.contributor.author","Offermann, Christine"],["dc.contributor.author","Sternad, Wolfgang"],["dc.contributor.author","Clemenz, Christian"],["dc.contributor.author","Naumann, Pascale Sarah"],["dc.contributor.author","Gasche, Rainer"],["dc.contributor.author","Kögel-Knabner, Ingrid"],["dc.contributor.author","Gessler, Arthur"],["dc.contributor.author","Rennenberg, Heinz"],["dc.contributor.author","Polle, Andrea"],["dc.date.accessioned","2017-09-07T11:50:45Z"],["dc.date.available","2017-09-07T11:50:45Z"],["dc.date.issued","2010"],["dc.description.abstract","The goal of this work was to increase the understanding of factors regulating nitrogen (N) competition between roots and soil microbes. For this purpose, root assimilate supply was diminished or abolished in beech (Fagus sylvatica L.) seedlings by girdling, drought stress or a combination of both factors. This was revealed by 13C tracer abundance in root tips after 13CO2 pulse labelling of the shoots. Analysis of different root tip fractions revealed that only 6% were ectomycorrhizal. Carbon (C) allocation to ectomycorrhizal and vital non-mycorrhizal root tips was ~26% higher than to distorted root tips. Drought resulted in ~30% increased ammonium (NH4+) and amino acid concentrations in roots and ~65% increased soil NH4+ concentrations, probably because of lower consumption of NH4+ by free-living microorganisms. Root uptake of glutamine of 13 nmol g–1 fresh mass h–1 decreased 2-fold with drought, although the number of vital root tips did not decrease. Carbon content in biomass of free-living microbes increased with glucose application regardless of drought, resulting in significant depletion in soil nitrate (NO3–), root NH4+ and amino acid concentrations. Our results suggest that the root–soil system of young beech trees was C-limited, and this prevented amino acid metabolism in roots and microbial NO3– consumption in the soil, thereby exerting feedback inhibition on uptake of inorganic N by roots. We suggest that rhizodeposition is a key link in regulating the plant–microbial N balance."],["dc.identifier.doi","10.1071/fp09309"],["dc.identifier.gro","3147814"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5143"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","1445-4408"],["dc.title","Carbon and nitrogen balance in beech roots under competitive pressure of soil-borne microorganisms induced by girdling, drought and glucose application"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","657"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Plant and Soil"],["dc.bibliographiccitation.lastpage","668"],["dc.bibliographiccitation.volume","369"],["dc.contributor.author","Guo, Chanjuan"],["dc.contributor.author","Simon, Judy"],["dc.contributor.author","Gasche, Rainer"],["dc.contributor.author","Naumann, Pascale Sarah"],["dc.contributor.author","Bimüller, Carolin"],["dc.contributor.author","Pena, Rodica"],["dc.contributor.author","Polle, Andrea"],["dc.contributor.author","Kögel-Knabner, Ingrid"],["dc.contributor.author","Zeller, Bernd"],["dc.contributor.author","Rennenberg, Heinz"],["dc.contributor.author","Dannenmann, Michael"],["dc.date.accessioned","2017-09-07T11:49:20Z"],["dc.date.available","2017-09-07T11:49:20Z"],["dc.date.issued","2013"],["dc.description.abstract","Aims Our aims were to characterize the fate of leaf-litter-derived nitrogen in the plant-soil-microbe system of a temperate beech forest of Southern Germany and to identify its importance for N nutrition of beech seedlings. Methods 15N-labelled leaf litter was traced in situ into abiotic and biotic N pools in mineral soil as well as into beech seedlings and mycorrhizal root tips over three growing seasons. Results There was a rapid transfer of 15N into the mineral soil already 21 days after tracer application with soil microbial biomass initially representing the dominant litter-N sink. However, 15N recovery in non-extractable soil N pools strongly increased over time and subsequently became the dominant 15N sink. Recovery in plant biomass accounted for only 0.025 % of 15N excess after 876 days. After three growing seasons, 15N excess recovery was characterized by the following sequence: non-extractable soil N >> extractable soil N including microbial biomass >> plant biomass > ectomycorrhizal root tips. Conclusions After quick vertical dislocation and cycling through microbial N pools, there was a rapid stabilization of leaf-litter-derived N in non-extractable N pools of the mineral soil. Very low 15N recovery in beech seedlings suggests a high importance of other N sources such as root litter for N nutrition of beech understorey."],["dc.identifier.doi","10.1007/s11104-013-1603-6"],["dc.identifier.gro","3147263"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/4889"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","0032-079X"],["dc.title","Minor contribution of leaf litter to N nutrition of beech (Fagus sylvatica) seedlings in a mountainous beech forest of Southern Germany"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1622"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Soil Biology and Biochemistry"],["dc.bibliographiccitation.lastpage","1631"],["dc.bibliographiccitation.volume","41"],["dc.contributor.author","Dannenmann, Michael"],["dc.contributor.author","Simon, Judy"],["dc.contributor.author","Gasche, Rainer"],["dc.contributor.author","Holst, Jutta"],["dc.contributor.author","Naumann, Pascale Sarah"],["dc.contributor.author","Kögel-Knabner, Ingrid"],["dc.contributor.author","Knicker, Heike"],["dc.contributor.author","Mayer, Helmut"],["dc.contributor.author","Schloter, Michael"],["dc.contributor.author","Pena, Rodica"],["dc.contributor.author","Polle, Andrea"],["dc.contributor.author","Rennenberg, Heinz"],["dc.contributor.author","Papen, Hans"],["dc.date.accessioned","2017-09-07T11:49:15Z"],["dc.date.available","2017-09-07T11:49:15Z"],["dc.date.issued","2009"],["dc.description.abstract","Nitrogen (N) cycling in terrestrial ecosystems is complex since it involves the closely interwoven processes of both N uptake by plants and microbial turnover of a variety of N metabolites. Major interactions between plants and microorganisms involve competition for the same N species, provision of plant nutrients by microorganisms and labile carbon (C) supply to microorganisms by plants via root exudation. Despite these close links between microbial N metabolism and plant N uptake, only a few studies have tried to overcome isolated views of plant N acquisition or microbial N fluxes. In this study we studied competitive patterns of N fluxes in a mountainous beech forest ecosystem between both plants and microorganisms by reducing rhizodeposition by tree girdling. Besides labile C and N pools in soil, we investigated total microbial biomass in soil, microbial N turnover (N mineralization, nitrification, denitrification, microbial immobilization) as well as microbial community structure using denitrifiers and mycorrhizal fungi as model organisms for important functional groups. Furthermore, plant uptake of organic and inorganic N and N metabolite profiles in roots were determined. Surprisingly plants preferred organic N over inorganic N and nitrate (NO3−) over ammonium (NH4+) in all treatments. Microbial N turnover and microbial biomass were in general negatively correlated to plant N acquisition and plant N pools, thus indicating strong competition for N between plants and free living microorganisms. The abundance of the dominant mycorrhizal fungi Cenococcum geophilum was negatively correlated to total soil microbial biomass but positively correlated to glutamine uptake by beech and amino acid concentration in fine roots indicating a significant role of this mycorrhizal fungus in the acquisition of organic N by beech. Tree girdling in general resulted in a decrease of dissolved organic carbon and total microbial biomass in soil while the abundance of C. geophilum remained unaffected, and N uptake by plants was increased. Overall, the girdling-induced decline of rhizodeposition altered the competitive balance of N partitioning in favour of beech and its most abundant mycorrhizal symbiont and at the expense of heterotrophic N turnover by free living microorganisms in soil. Similar to tree girdling, drought periods followed by intensive drying/rewetting events seemed to have favoured N acquisition by plants at the expense of free living microorganisms."],["dc.identifier.doi","10.1016/j.soilbio.2009.04.024"],["dc.identifier.gro","3147229"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/4861"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","0038-0717"],["dc.title","Tree girdling provides insight on the role of labile carbon in nitrogen partitioning between soil microorganisms and adult European beech"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Geophysical Research Abstracts"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Dannenmann, Michael"],["dc.contributor.author","Simon, Judy"],["dc.contributor.author","Gasche, Rainer"],["dc.contributor.author","Pena, Rodica"],["dc.contributor.author","Polle, Andrea"],["dc.contributor.author","Rennenberg, Heinz"],["dc.contributor.author","Papen, Hans"],["dc.date.accessioned","2018-11-26T14:44:17Z"],["dc.date.available","2018-11-26T14:44:17Z"],["dc.date.issued","2010"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/56964"],["dc.language.iso","en"],["dc.notes.status","fcwi"],["dc.relation.conference","EGU General Assembly"],["dc.relation.eventend","2010-05-07"],["dc.relation.eventlocation","Vienna, Austria"],["dc.relation.eventstart","2010-05-02"],["dc.title","Tree girdling as a tool to study plant-microbe C- and N interactions in beech rhizsophere"],["dc.type","conference_abstract"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","207"],["dc.bibliographiccitation.journal","Environmental and Experimental Botany"],["dc.bibliographiccitation.lastpage","217"],["dc.bibliographiccitation.volume","87"],["dc.contributor.author","Pena, Rodica"],["dc.contributor.author","Simon, Judy"],["dc.contributor.author","Rennenberg, Heinz"],["dc.contributor.author","Polle, Andrea"],["dc.date.accessioned","2017-09-07T11:49:33Z"],["dc.date.available","2017-09-07T11:49:33Z"],["dc.date.issued","2013"],["dc.description.abstract","The aim of this study was to investigate the influence of ectomycorrhizal fungi (EMF) on the architecture of and nitrogen (N) partitioning in young beech (Fagus sylvatica) plants in response to different light regimes and water deprivation. We hypothesized that EMF modify biomass partitioning and architecture of young beech plants by increased N uptake in comparison with non-mycorrhizal (NM) plants and that therefore, the drought responses of EM and NM plants diverge. We anticipated that full light-exposed plants were more drought tolerant due to improved water status and nutrition, whereas shade-acclimated EM plants were more drought susceptible because of decreased mycorrhizal colonization. To test these hypotheses seedlings were grown in native or sterilized forest soil. To avoid effects of soil pretreatment NM and EM plants were transplanted into sand-peat culture systems and exposed to shade, drought or the combination of both factors. Shade resulted in reduced root biomass production decreasing the root-to-shoot ratio. Mild drought stress (pre-dawn water potential [Ψpd] = −1.3 MPa) did not affect biomass partitioning. EMF colonization did not increase plant biomass, but had strong effects on root architecture: the numbers of root tips as well as the absolute and specific root lengths were increased because of formation of thin roots, especially in the diameter classes from 0.2 to 0.8 mm. In contrast to our expectation N uptake of well irrigated EM plants was not increased despite their larger potential for soil exploitation. Overall, EM plants exhibited higher amounts of carbon fixed per unit of N taken up than NM plants and shifted N partitioning towards the roots. Beneficial effects of EMFs were apparent under mild drought but the responses differed depending on the light availability: shaded EM plants showed a delay in the decrease of Ψpd; light exposed EM plants showed increased N uptake compared with NM beeches. These results indicate that EMFs are involved in mediating divergent responses of beech to drought depending on the light availability."],["dc.identifier.doi","10.1016/j.envexpbot.2012.11.005"],["dc.identifier.gro","3147331"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/4937"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","0098-8472"],["dc.title","Ectomycorrhiza affect architecture and nitrogen partitioning of beech (Fagus sylvatica L.) seedlings under shade and drought"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","89"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Plant and Soil"],["dc.bibliographiccitation.lastpage","114"],["dc.bibliographiccitation.volume","418"],["dc.contributor.author","Simon, Judy"],["dc.contributor.author","Dannenmann, Michael"],["dc.contributor.author","Pena, Rodica"],["dc.contributor.author","Gessler, Arthur"],["dc.contributor.author","Rennenberg, Heinz"],["dc.date.accessioned","2020-12-10T14:11:46Z"],["dc.date.available","2020-12-10T14:11:46Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1007/s11104-017-3293-y"],["dc.identifier.eissn","1573-5036"],["dc.identifier.issn","0032-079X"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/71201"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Nitrogen nutrition of beech forests in a changing climate: importance of plant-soil-microbe water, carbon, and nitrogen interactions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]