Tränkner, Merle

[["dc.bibliographiccitation.firstpage","20"],["dc.bibliographiccitation.journal","Journal of Plant Physiology"],["dc.bibliographiccitation.lastpage","30"],["dc.bibliographiccitation.volume","209"],["dc.contributor.author","Jakli, Balint"],["dc.contributor.author","Tavakol, Ershad"],["dc.contributor.author","Traenkner, Merle"],["dc.contributor.author","Senbayrama, Mehmet"],["dc.contributor.author","Dittert, Klaus"],["dc.date.accessioned","2018-11-07T10:27:55Z"],["dc.date.available","2018-11-07T10:27:55Z"],["dc.date.issued","2017"],["dc.description.abstract","Potassium (K) is crucial for crop growth and is strongly related to stress tolerance and water-use efficiency (WUE). A major physiological effect of K deficiency is the inhibition of net CO2 assimilation (AN) during photosynthesis. Whether this reduction originates from limitations either to photochemical energy conversion or biochemical CO2 fixation or from a limitation to CO2 diffusion through stomata and the leaf mesophyll is debated. In this study, limitations to photosynthetic carbon gain of sunflower (Helianthus annuus L.) under K deficiency and PEG-induced water deficit were quantified and their implications on plant-and leaf-scale WUE (WUEp, WUEL) were evaluated. Results show that neither maximum quantum use efficiency (F-v/F-m) nor in-vivo RubisCo activity were directly affected by K deficiency and that the observed impairment of A(N) was primarily due to decreased CO2 mesophyll conductance (g(m)). K deficiency additionally impaired leaf area development which, together with reduced A(N), resulted in inhibition of plant growth and a reduction of WUEp. Contrastingly, WUEL was not affected by K supply which indicated no inhibition of stomatal control. PEG-stress further impeded A(N) by stomatal closure and resulted in enhanced WUEL and high oxidative stress. It can be concluded from this study that reduction of g(m) is a major response of leaves to K deficiency, possibly due to changes in leaf anatomy, which negatively affects A(N) and contributes to the typical symptoms like oxidative stress, growth inhibition and reduced WUEp. (C) 2016 Elsevier GmbH. All rights reserved."],["dc.description.sponsorship","K+S KALI GmbH, Kassel, Germany"],["dc.identifier.doi","10.1016/j.jplph.2016.11.010"],["dc.identifier.isi","000395687400003"],["dc.identifier.pmid","28012363"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/43319"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Elsevier Gmbh, Urban & Fischer Verlag"],["dc.relation.issn","1618-1328"],["dc.relation.issn","0176-1617"],["dc.title","Quantitative limitations to photosynthesis in K deficient sunflower and their implications on water-use efficiency"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["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","682"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Journal of Plant Nutrition and Soil Science"],["dc.bibliographiccitation.lastpage","692"],["dc.bibliographiccitation.volume","178"],["dc.contributor.author","Senbayram, Mehmet"],["dc.contributor.author","Traenkner, Merle"],["dc.contributor.author","Dittert, Klaus"],["dc.contributor.author","Brueck, Holger"],["dc.date.accessioned","2018-11-07T09:53:55Z"],["dc.date.available","2018-11-07T09:53:55Z"],["dc.date.issued","2015"],["dc.description.abstract","The increasing probability of seasonal droughts and freshwater scarcity emphasizes the importance of crop traits such as water-use efficiency (WUE) and its relation to nutrient management. In an earlier study using soil substrate in a pot experiment, we reported significant positive effects of N supply on biomass WUE of tobacco. However, there was a debate that the latter may be due to indirect effects of N supply (hidden drought), most likely because plants supplied with adequate N generally have greater biomass and hence faster depletion of soil water in the root zone. In pot and in field situation, therefore, it is difficult to relate any variation in leaf or biomass WUE to the direct effect of N supply. In this context, the aim of the current study was to re-examine to what extent N fertilization directly affects biomass WUE and related parameters under non-limiting water supply in hydroponics. About 2 weeks after the transfer of tobacco seedlings into nutrient solution containing 2 mM N, plants were treated with high-N or low-N in the form of NH4NO3. A marked decrease in CO2 assimilation with low-N supply compared to high-N supply was measured already 5 d after onset of treatments (DAO). In contrast, three different experiments clearly showed that stomatal conductance (g(s)) remained almost constant until 5 DAO resulting in significantly lower leaf WUE under low-N compared to high-N. Leaf WUE decreased gradually (up to 42% lower leaf WUE) at later stages. Surprisingly, biomass WUE and whole-plant C-13 values were not affected by N supply at any harvest date, which is in contrast to our earlier report where we observed clearly positive effects of N supply on biomass WUE of the same tobacco variety in a pot experiment with soil substrate. Night-time respiration and transpiration rates (measured by gas exchange and thermal imaging) were significantly higher with high-N supply than with low-N supply. The data show that 48.6% and 9.8% of the beneficiary effect of N on daytime leaf WUE were lost when nocturnal stomatal conductance and night-time respiration of the same leaves were taken into consideration. Thus, we conclude that earlier reports showing positive effects of N supply on biomass WUE and C-13 values in soil or field experiments may be due to indirect effect of N supply (e.g., hidden/mild drought)."],["dc.identifier.doi","10.1002/jpln.201400608"],["dc.identifier.isi","000359062700016"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/36429"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-v C H Verlag Gmbh"],["dc.relation.issn","1522-2624"],["dc.relation.issn","1436-8730"],["dc.title","Daytime leaf water use efficiency does not explain the relationship between plant N status and biomass water-use efficiency of tobacco under non-limiting water supply"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["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","733"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Journal of Plant Nutrition and Soil Science"],["dc.bibliographiccitation.lastpage","745"],["dc.bibliographiccitation.volume","179"],["dc.contributor.author","Jakli, Balint"],["dc.contributor.author","Traenkner, Merle"],["dc.contributor.author","Senbayram, Mehmet"],["dc.contributor.author","Dittert, Klaus"],["dc.date.accessioned","2018-11-07T10:05:23Z"],["dc.date.available","2018-11-07T10:05:23Z"],["dc.date.issued","2016"],["dc.description.abstract","Enhancing crop water-use efficiency (WUE) is a major research objective in water-scarce agroecosystems. Potassium (K) enhances WUE and plays a crucial role in mitigating plant stress. Here, effects of K supply and PEG-induced water deficit on WUE of spring wheat (Triticum aestivum L. var. Sonett), grown in nutrient solution, were studied. Plants were treated with three levels of K supply (0.1, 1, 4 mM K+) and two levels of PEG (0, 25%). WUE was determined at leaf level (WUE L), at whole-plant level (WUEP), and via carbon isotope ratio (delta C-13). Effects of assimilation and stomatal conductance on WUE L were evaluated and compared with effects of biomass production and whole-plant transpiration (E-P) on WUEP. Adequate K supply enhanced WUEP up to 30% and by additional 20% under PEG stress, but had no effect on WUEL. E-P was lower with adequate K supply, but this effect may be attributed to canopy microclimate. Shoot delta C-13 responded linearly to time-integrated WUEL in adequately supplied plants, but not in K-deficient plants, indicating negative effects of K deficiency on mesophyll CO2 diffusion. It is concluded that leaf-scale evaluations of WUE are not reliable in predicting whole-plant WUE of crops such as spring wheat suffering K deficiency."],["dc.description.sponsorship","K+S KALI GmbH, Kassel, Germany"],["dc.identifier.doi","10.1002/jpln.201600340"],["dc.identifier.isi","000389031900006"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38883"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-v C H Verlag Gmbh"],["dc.relation.issn","1522-2624"],["dc.relation.issn","1436-8730"],["dc.title","Adequate supply of potassium improves plant water-use efficiency but not leaf water-use efficiency of spring wheat"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]