Tränkner, Merle

[["dc.bibliographiccitation.firstpage","234"],["dc.bibliographiccitation.journal","Plant Physiology and Biochemistry"],["dc.bibliographiccitation.lastpage","243"],["dc.bibliographiccitation.volume","144"],["dc.contributor.author","Tränkner, Merle"],["dc.contributor.author","Jamali Jaghdani, Setareh"],["dc.date.accessioned","2020-12-10T15:20:52Z"],["dc.date.available","2020-12-10T15:20:52Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1016/j.plaphy.2019.09.040"],["dc.identifier.issn","0981-9428"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16919"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/72835"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.intern","Merged from goescholar"],["dc.rights","CC BY-NC-ND 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by-nc-nd/4.0"],["dc.title","Minimum magnesium concentrations for photosynthetic efficiency in wheat and sunflower seedlings"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","100040"],["dc.bibliographiccitation.journal","Plant Stress"],["dc.bibliographiccitation.volume","2"],["dc.contributor.author","Jamali Jaghdani, Setareh"],["dc.contributor.author","Jahns, Peter"],["dc.contributor.author","Tränkner, Merle"],["dc.date.accessioned","2021-11-16T14:59:07Z"],["dc.date.available","2021-11-16T14:59:07Z"],["dc.date.issued","2021"],["dc.description.abstract","Limited magnesium (Mg) supply adversely affects photosynthesis. This is particularly related to the high demand for Mg of key enzymes in the chloroplast, such as the photosystems, the ATP synthase and ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco). The accepted critical Mg concentrations for yield and dry matter (DM) are 1.5–3.5 mg Mg g−1 DM. Earlier studies on Mg deficiency indicated that carbon fixation by Rubisco is severely affected in various plant species, whereas the impact of Mg scarcity on light reactions and photoprotective mechanisms is quite variable. The latter could be related to species-specific differences in the general high light-sensitivity of photosynthetic light reactions. To test this hypothesis, we studied the impact of Mg deficiency in spinach (Spinacia oleracea) plants, which are known to be rather high light resistant. S. oleracea seeds were grown hydroponically under four Mg treatments (1 (control), 0.05, 0.025 and 0.015 mM) and the impact of Mg deficiency on CO2 assimilation, photosynthetic light reactions and photoprotection was determined. Our results show that the photosynthetic efficiency and the overall light stress response were not altered under Mg deficiency, whereas the CO2 assimilation as well as leaf and root Mg concentrations were significantly reduced."],["dc.identifier.doi","10.1016/j.stress.2021.100040"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17874"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/93057"],["dc.language.iso","en"],["dc.notes.intern","Migrated from goescholar"],["dc.relation.issn","2667-064X"],["dc.rights.access","openAccess"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject","Chlorophyll fluorescence, Crop nutrition, Mg, Photoprotection, Photosynthesis"],["dc.subject.ddc","630"],["dc.title","The impact of magnesium deficiency on photosynthesis and photoprotection in Spinacia oleracea"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Frontiers in Plant Science"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Hou, Wenfeng"],["dc.contributor.author","Tränkner, Merle"],["dc.contributor.author","Lu, Jianwei"],["dc.contributor.author","Yan, Jinyao"],["dc.contributor.author","Huang, Siyuan"],["dc.contributor.author","Ren, Tao"],["dc.contributor.author","Cong, Rihuan"],["dc.contributor.author","Li, Xiaokun"],["dc.date.accessioned","2020-12-10T18:46:49Z"],["dc.date.available","2020-12-10T18:46:49Z"],["dc.date.issued","2020"],["dc.description.abstract","Evaluation of nitrogen (N) status by leaf color is a kind of classic nutritional diagnostic method. However, the color of leaves is influenced not only by N, but also by other nutrients such as potassium (K). Two-year field trials with a factorial combination of N and K were conducted to investigate the effects of different N and K rates on soil plant analysis development (SPAD) readings and leaf N, K, magnesium (Mg), and chlorophyll concentrations. Visual inspections in leaf greenness revealed darker green leaves with increasing N rates, while paler green leaves with increasing K rates. Data showed that SPAD readings, chlorophyll, N and Mg concentrations, and the chloroplast area increased significantly with raising N rates, while declined sharply with the increase in K rates due to the antagonistic relationships between K+ and NH4 + as well as Mg2+. It was also probable that the increase in K promoted the growth of leaves and diluted their N and Mg concentrations. The paler leaf appearance resulting from the application of K may overestimate the actual demand for N in the diagnosis of rice N status. The strong antagonistic relationships between K+, NH4 +, and Mg2+ should be considered in rice production and fertilization."],["dc.identifier.doi","10.3389/fpls.2020.00165"],["dc.identifier.eissn","1664-462X"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/78557"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.publisher","Frontiers Media S.A."],["dc.relation.eissn","1664-462X"],["dc.rights","http://creativecommons.org/licenses/by/4.0/"],["dc.title","Diagnosis of Nitrogen Nutrition in Rice Leaves Influenced by Potassium Levels"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","6031"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","International Journal of Molecular Sciences"],["dc.bibliographiccitation.lastpage","6045"],["dc.bibliographiccitation.volume","15"],["dc.contributor.author","Cabeza, Ricardo A."],["dc.contributor.author","Lingner, Annika"],["dc.contributor.author","Liese, Rebecca"],["dc.contributor.author","Sulieman, Saad"],["dc.contributor.author","Senbayram, Mehmet"],["dc.contributor.author","Traenkner, Merle"],["dc.contributor.author","Dittert, Klaus"],["dc.contributor.author","Schulze, Joachim"],["dc.date.accessioned","2018-11-07T09:41:34Z"],["dc.date.available","2018-11-07T09:41:34Z"],["dc.date.issued","2014"],["dc.description.abstract","Legumes match the nodule number to the N demand of the plant. When a mutation in the regulatory mechanism deprives the plant of that ability, an excessive number of nodules are formed. These mutants show low productivity in the fields, mainly due to the high carbon burden caused through the necessity to supply numerous nodules. The objective of this study was to clarify whether through optimal conditions for growth and CO2 assimilation a higher nodule activity of a supernodulating mutant of Medicago truncatula (M. truncatula) can be induced. Several experimental approaches reveal that under the conditions of our experiments, the nitrogen fixation of the supernodulating mutant, designated as sunn (super numeric nodules), was not limited by photosynthesis. Higher specific nitrogen fixation activity could not be induced through short-or long-term increases in CO2 assimilation around shoots. Furthermore, a whole plant P depletion induced a decline in nitrogen fixation, however this decline did not occur significantly earlier in sunn plants, nor was it more intense compared to the wild-type. However, a distinctly different pattern of nitrogen fixation during the day/night cycles of the experiment indicates that the control of N-2 fixing activity of the large number of nodules is an additional problem for the productivity of supernodulating mutants."],["dc.identifier.doi","10.3390/ijms15046031"],["dc.identifier.fs","608778"],["dc.identifier.isi","000336841200057"],["dc.identifier.pmid","24727372"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/11711"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/33763"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Mdpi Ag"],["dc.relation.issn","1422-0067"],["dc.rights.access","openAccess"],["dc.subject.mesh","Carbon Dioxide"],["dc.subject.mesh","Medicago truncatula"],["dc.subject.mesh","Nitrogen"],["dc.subject.mesh","Nitrogen Fixation"],["dc.subject.mesh","Phosphorus"],["dc.subject.mesh","Photosynthesis"],["dc.subject.mesh","Plant Shoots"],["dc.subject.mesh","Root Nodules, Plant"],["dc.title","The Activity of Nodules of the Supernodulating Mutant Mt(sunn) Is not Limited by Photosynthesis under Optimal Growth Conditions"],["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"]]

[["dc.bibliographiccitation.firstpage","235"],["dc.bibliographiccitation.journal","Frontiers in Plant Science"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Nogueira Júnior, Antonio F."],["dc.contributor.author","Tränkner, Merle"],["dc.contributor.author","Ribeiro, Rafael V."],["dc.contributor.author","Tiedemann, Andreas von"],["dc.contributor.author","Amorim, Lilian"],["dc.date.accessioned","2020-04-29T12:31:18Z"],["dc.date.available","2020-04-29T12:31:18Z"],["dc.date.issued","2020"],["dc.description.abstract","Downy mildew caused by Plasmopara viticola is one of the most destructive diseases of Vitis vinifera worldwide. Grapevine breeding programs have introgressed P. viticola-resistant traits into cultivated V. vinifera genotypes and launched interspecific hybrids with resistance against downy mildew. In general, pathogen infection affects primary metabolism, reduces plant growth and development and modifies the secondary metabolism toward defense responses, which are costly in terms of carbon production and utilization. The objective of this work was to evaluate the photosynthesis impairment by inducible defenses at the leaf level in V. vinifera cultivars resistant to P. viticola. Photosynthetic limitations imposed by P. viticola in susceptible and resistant grapevine cultivars were evaluated. Histochemical localization of hydrogen peroxide and superoxide and the activity of ascorbate peroxidase were assessed. Measurements of leaf gas exchange, chlorophyll fluorescence and the response of leaf CO2 assimilation to increasing air CO2 concentrations were taken, and photosynthetic limitations determined in cultivars Solaris (resistant) and Riesling (susceptible). The net photosynthetic rates were reduced (-25%) in inoculated Solaris plants even before the appearance of cell death-like hypersensitive reactions (\"HR\"). One day after \"HR\" visualization, the net photosynthetic rate of Solaris was reduced by 57% compared with healthy plants. A similar pattern was noticed in resistant Cabernet Blanc and Phoenix plants. While the susceptible cultivars did not show any variation in leaf gas exchange before the appearance of visual symptoms, drastic reductions in net photosynthetic rate and stomatal conductance were found in diseased plants 12 days after inoculation. Decreases in the maximum Rubisco carboxylation rate and photochemical impairment were noticed in Riesling after inoculation with P. viticola, which were not found in Solaris. Damage to the photochemical reactions of photosynthesis was likely associated with the oxidative burst found in resistant cultivars within the first 24 h after inoculation. Both chlorophyll degradation and stomatal closure were also noticed in the incompatible interaction. Taken together, our data clearly revealed that the defense response against P. viticola causes a photosynthetic cost to grapevines, which is not reversible even 12 days after the pathogen infection."],["dc.identifier.doi","10.3389/fpls.2020.00235"],["dc.identifier.pmid","32265949"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17386"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/64473"],["dc.language.iso","en"],["dc.notes.intern","DeepGreen Import"],["dc.publisher","Frontiers Media S.A."],["dc.relation.eissn","1664-462X"],["dc.relation.issn","1664-462X"],["dc.rights","http://creativecommons.org/licenses/by/4.0/"],["dc.title","Photosynthetic Cost Associated With Induced Defense to Plasmopara viticola in Grapevine"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","BMC Plant Biology"],["dc.bibliographiccitation.volume","19"],["dc.contributor.author","Hou, Wenfeng"],["dc.contributor.author","Tränkner, Merle"],["dc.contributor.author","Lu, Jianwei"],["dc.contributor.author","Yan, Jinyao"],["dc.contributor.author","Huang, Siyuan"],["dc.contributor.author","Ren, Tao"],["dc.contributor.author","Cong, Rihuan"],["dc.contributor.author","Li, Xiaokun"],["dc.date.accessioned","2020-12-10T18:38:52Z"],["dc.date.available","2020-12-10T18:38:52Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1186/s12870-019-1894-8"],["dc.identifier.eissn","1471-2229"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16272"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/77460"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.intern","Merged from goescholar"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Interactive effects of nitrogen and potassium on photosynthesis and photosynthetic nitrogen allocation of rice leaves"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","409"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Plant and Soil"],["dc.bibliographiccitation.lastpage","423"],["dc.bibliographiccitation.volume","406"],["dc.contributor.author","Traenkner, Merle"],["dc.contributor.author","Jakli, Balint"],["dc.contributor.author","Tavakol, Ershad"],["dc.contributor.author","Geilfus, Christoph-Martin"],["dc.contributor.author","Cakmak, Ismail"],["dc.contributor.author","Dittert, Klaus"],["dc.contributor.author","Senbayram, Mehmet"],["dc.date.accessioned","2018-11-07T10:09:53Z"],["dc.date.available","2018-11-07T10:09:53Z"],["dc.date.issued","2016"],["dc.description.abstract","In water-scarce agro-environments a clear understanding of how plant nutrients like magnesium (Mg) affect plant traits related to water-use efficiency (WUE) is of great importance. Magnesium plays a crucial role in photosynthesis and is thus a major determinant of biomass formation. This study investigated the effect of Mg deficiency on leaf and whole plant water-use efficiency, delta C-13 composition, hydrogen peroxide (H2O2) production and the activity of key enzymes involved in ROS scavenging in barley. Barley (Hordeum vulgare) was grown in hydroponic culture under three different levels of Mg supply (0.01, 0.1, 0.4 mM Mg). WUE was determined on the leaf-level (leaf-WUE), the biomass-level (biomass-WUE) and via carbon isotope discrimination (delta C-13). Additionally, concentrations of Mg, chlorophyll and H2O2, and the activities of three antioxidative enzymes (ascorbate peroxidase, glutathione reductase and superoxide dismutase) in youngest fully expanded leaves were analyzed. Dry matter production was significantly decreased (by 34 % compared to control) in Mg deficient barley plants. Mg deficiency also markedly reduced leaf Mg concentrations and chlorophyll concentrations, but increased H2O2 concentrations (up to 55 % compared to control) and the activity of antioxidative enzymes. Severe Mg deficiency decreased biomass-WUE by 20 %, which was not reflected regarding leaf-WUE. In line with leaf-WUE data, discrimination against C-13 (indicating time-integrated WUE) was significantly reduced under Mg deficiency. Mg deficiency increased oxidative stress indicating impairment in carbon gain and decreased biomass-WUE. Our study suggests that biomass-WUE was not primarily affected by photosynthesis-related processes, but might be dependent on effects of Mg on night-time transpiration, respiration or root exudation."],["dc.identifier.doi","10.1007/s11104-016-2886-1"],["dc.identifier.isi","000381991600028"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/13304"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/39741"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1573-5036"],["dc.relation.issn","0032-079X"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Magnesium deficiency decreases biomass water-use efficiency and increases leaf water-use efficiency and oxidative stress in barley plants"],["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"]]

[["dc.bibliographiccitation.firstpage","100102"],["dc.bibliographiccitation.journal","Plant Stress"],["dc.bibliographiccitation.volume","5"],["dc.contributor.author","Wilmer, Lisanne"],["dc.contributor.author","Tränkner, Merle"],["dc.contributor.author","Pawelzik, Elke"],["dc.contributor.author","Naumann, Marcel"],["dc.date.accessioned","2022-08-02T14:24:20Z"],["dc.date.available","2022-08-02T14:24:20Z"],["dc.date.issued","2022"],["dc.description.abstract","Potassium (K) plays a crucial role in reducing the severity of drought stress. Potatoes are considered drought\r\nsensitive crops due to their shallow root system. In this study, potato cultivars ‘Milva’ and ‘Agria’ grown under -K\r\n(75 μM) and +K (1000 μM) supply in a hydroponic system were examined under greenhouse conditions. Half of\r\nthe plants for each cultivar and K supply were treated for two weeks with polyethylene glycol (PEG) to induce\r\nosmotic stress at 67 days after planting (dap). For recovery, plants grew two more weeks without PEG. Plant\r\nheight, biomass, and water consumption were measured weekly. Leaflets were analysed before, during, and after\r\nPEG addition to subsequently determine parameters, for example, total free amino acids and metabolites.\r\nAdditionally, the K allocation in plant parts was determined. K supply and PEG positively affected biomass\r\nproduction, and the production of side shoots was enhanced with -K and PEG. The water consumption increased\r\nwith PEG addition in Milva, which was not observed in Agria. K and sugars accumulated in side shoots, showing\r\ncultivar and treatments specific reactions. Individual amino acids, including isoleucine, leucine, valine, and\r\nalanine, accumulated under low K supply and PEG-induced osmotic stress, and functional characterization could\r\nprovide information on the response to drought stress. However, K remained an important variable, providing\r\nfunctions of other osmolytes to maintain plant metabolism. The results revealed morphophysiological and\r\nbiochemical indications for adaption mechanisms against osmotic stress and may help to identify drought stress tolerant cultivars."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2022"],["dc.identifier.doi","10.1016/j.stress.2022.100102"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/112596"],["dc.language.iso","en"],["dc.relation.issn","2667-064X"],["dc.relation.orgunit","Abteilung Qualität pflanzlicher Erzeugnisse"],["dc.rights","CC BY-NC-ND 4.0"],["dc.title","Sufficient potassium supply enhances tolerance of potato plants to PEG-induced osmotic stress"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]