Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"root nodules"”.
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Carbon partitioning in nitrogen-fixing root nodules
Stickstoff-fixierende Wurzelnknöllchen repräsentieren starke Kohlenstoff- sinks". Die Zucker- verteilung wurde in verschiedenen symbiotischen Systemen untersucht, nämlich in einer Leguminose, Medicago truncatula, und zweier Aktinorhizapflanzen, Casuarina glauca und Datisca glomerata. Die …
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Seasonal and site relationships to acetylene reduction by actinorhizal black alder and Russian olive root nodules
Acetylene-reduction activities (ARA) by root nodules of 4- to 8-year-old black alder (Alnus glutinosa (L.) Gaertn.) on an upland Alfisol and alder and Russian olive (Elaeagnus angustifolia L.) on a bottomland Mollisol increased exponentially with soil temperature. Soil moisture content, pH and …
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Evaluation of Nitrogenase Genes as Markers in Soil Microbial Community Studies
… bacteria of the genus Frankia that form root-nodules in symbiosis with certain woody plants. The diversity of nodule-forming frankiae was assessed in soils from 5 continents, and in natural populations in root nodules of alder trees growing on 3 different mountain tops in central and …
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Dissecting the NCR Peptide Landscape in the R108 Ecotype in Medicago Truncatula and the Search for the NF21325 Symbiotic Mutant
… utilize Symbiotic Nitrogen Fixation (SNF) within root nodules to convert atmospheric nitrogen into bioavailable ammonium. In Medicago truncatula, nearly 700 Nodule-specific Cysteine-Rich (NCR) peptides regulate this process. This study investigates the R108 mutant line NF21325, featuring a Tnt1 …
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Physiological effects of moisture stress, moisture stress conditioning, and leaf area manipulations on black alder seedlings (Alnus glutinosa (L.) Gaertn.)
… and the nitrogenase activity of the seedlings' root nodules. Endophyte strain was found to be nonsignificant in response to moisture deficit and moisture-stress conditioning (MSC). Using regression analysis MSC significantly decreased the impact of low water potentials on photosynthesis and …
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Optimizing soybean water use and nitrogen fixation to improve productivity under climate change
… posed to researchers and potential effects on root nodules. The first goal of this investigation was to develop an alternative method for non-invasively measuring nitrogen fixation that minimizes the above difficulties. A system was designed that enabled us to quantify N2 fixation as a function …
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Modulation of soybean and maize antioxidant activities by Caffeic acid and nitric oxide under salt stress
… This study investigates changes in H₂O₂ content, root lipid peroxidation, root cell death and antioxidant enzymatic activity in maize roots in response to exogenously applied nitric oxide (NO) and salt stress. This part of the study is based on the partially understood interaction between NO and …
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Physiological response of Rhizobium leguminosarum during bacteroid development
… symbioses, free-living rhizobia colonise root nodules and develop into N2 fixing specialists known as bacteroids. During bacteroid development, rhizobia must adapt to the nodule environment, consisting of reactive oxygen species, low oxygen, antimicrobial secondary metabolites, low pH and …
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The role of CLE peptides during nodulation
Legumes develop root nodules as a result of a symbiotic interaction with soil borne bacteria, called rhizobia. Inside the nodules the bacteria find the ideal niche to fix atmospheric nitrogen for the plant in return for energy sources. Nodule formation is a complex developmental process that …
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Molecular signalling in Lupinus albus-Rhizobium lupini symbiosis
… and Lupinus albus results in the formation of root nodules where nitrogen fixation takes place. In these associations, molecular signals such as flavonoids (or non-flavonoid type), nod gene-inducers, and bacterial lipochitooligosaccharides (LCOs) are known to act as modulators of …
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Systematics, Specificity, and Ecology of New Zealand Rhizobia
… bacteria that live in symbiosis with legumes in root nodules. Rhizobia fix Nitrogen from the atmosphere and provide this nutrient to the plant. The objectives of this research were to: 1) Determine the identity of the rhizobial species nodulating the native legumes of New Zealand: Sophora …
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Investigating key regulators of nitrogen demand signalling and symbiotic nitrogen fixation in Medicago truncatula
… N-fixing bacteria resulting in the formation of root nodules, where symbiotic N-fixation (SNF) occurs. The formation of nodules is an energy expensive process. Hence, nodulation in legumes is strictly regulated by the host through a peptide-receptor mediated systemic negative feedback loop known …
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A Study of the Genetics of Root Nodulation in Pigeonpea (Cajanus cajan) Using Indigenous Rhizobia
… atmospheric nitrogen (N) symbiotically in the root nodules thus elimination of the need for expensive chemical nitrogenous fertilizers. The determination of host plant x microsymbiont combinations that produce optimum crop productivity is important in the pigeonpea value chain. In addition, the …
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Evolution and Function of Receptor-like Kinases in Arbuscular Mycorrhizal Symbiosis
… also result in plants producing more lateral roots, a response observed for decades. Here, molecular mechanisms of this developmental response are elucidated, where general perception of chitin-derived molecules through LysM receptors and SYMRK activate lateral organ production. This response …
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Response of alfalfa to foliar applications of long-chain fatty acids or seed treatments with Chevron XE-1019
… alfalfa (Medicago sativa, Arc) shoot or root biomass when applied to 21 and 28 day-old plants. DPA treatments also had no effect (p=0.05) on the leakage of Ca²⁺, K⁺, Mg²⁺, and PO₄³⁻ from foliar leaf discs. Foliar treatments containing either 10 mM CaCl₂ + DPA or 10 mM CaC1₂ were effective …
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Exploring the Genomic, Plant Growth Promoting, and Biocontrol Potential of a novum species 'Candidatus Pseudomonas auctus' JDE115 with its description
… bacterium isolated from soybean (Glycine max) root nodules in Virginia. Growth occurred at 0–5.0% NaCl (optimum 1%), pH 6.0–10.0 (optimum 7.0), and 10–40°C (optimum 28°C). Phylogenetic analysis based on the 16S rRNA gene and whole-genome sequencing placed JDE115 within the genus Pseudomonas, …
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