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Showing 1 to 20 of 20 for “"Frankia"”.
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Soil colonization and drought adaptation of the actinomycete Frankia
A plant bioassay was used to enumerate infectious Frankia in soil and micro- and molecular techniques were used to identify possible mechanisms by which Frankia survive drying.
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Oxygen control of nitrogen fixation in Frankia and Coriaria arborea
… of nitrogen fixation activity in both asymbiotic Frankia and Frankia - actinorhizal plant symbioses. Daily addition of fresh medium at a low dilution rate (D=0.125 day⁻¹) allowed Frankia to be maintained in continuous culture with a stable rate of growth and nitrogenase activity for periods of …
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Investigation of a ribosomal RNA operon of Frankia sp. strain AcN14a.
With the aim of increasing our plant knowledge of Frankia, we have investigated the structure of the ribosomal RNA genes from Frankia sp. strain AcN14a. A genomic library was constructed in EMBL3 and two types of clones, each containing a different set of rRNA genes, were identified by restriction …
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Factors Influencing the Distribution, Growth and Infectivity of Casuarina-Infective Frankia
… inhibited nodulation of C. cunninghamiana by a Frankia isolate, suggesting the host may release compounds necessary to the nodulation process. In a final study, the infectivity of soils inoculated with Frankia isolate CjI82001 decreased over time, whereas infectivity of soils without inoculum …
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Étude phénotypique et génomique de la morphogénèse d'hyphes toruleux chez Frankia spp.
L’actinomycète Frankia est un pilier de la fixation d’azote pour les plantes ligneuses. En effet, il aide plus de 220 espèces de ces plantes à croître dans des conditions pauvres en nutriments, par exemple des endroits très sablonneux. Cependant, il subsiste encore beaucoup de questions sans …
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The development of tools to allow genetic and genomic analysis of Frankia
<p>Frankia, a nitrogen-fixing actinomycete, forms a symbiotic association with a variety of woody dicotyledonous plants. The lack of standard genetic tools for this important bacterium has hindered studies on the molecular biology of this symbiosis. We are interested in developing tools for the …
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Molecular mechanisms of salt and osmotic stress tolerance in Frankia strains isolated from Casuarina trees
… The nitrogen-fixing soil actinobacterium Frankia shows marked variability in its tolerance to salinity. When in a symbiotic association with actinorhizal plants, Frankia enhances the tolerance of the plants to a range of abiotic stresses, including salinity. The Casuarina-Frankia …
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Symbiotic relationships of <i>alnus glutinosa</i> with arbuscular mycorrhizal fungi and with <i>frankia</i>
… of inoculation of seedlings with AMF and <i>Frankia </i>were investigated. AMF characteristic of <i>Glomus</i>-like fungi were detected microscopically in <i>A. glutinosa</i> roots from mineral and loam but not from highly organic soils. Both <i>Glomus</i>- and <i>Gigaspora</i>-like fungi …
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Actinorhizal Plant Nodulation and Nitrogen Fixation in Natural and Experimental Systems
… study, water-retentive polymer carriers of Frankia inoculum were applied as a root dip to Alnus glutinosa and Casuarina equisetifoloia seedlings. This treatment increased nodulation 5- to 10-fold in greenhouse experiments and also of A. glutinosa in a field experiment.
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Evaluation of Nitrogenase Genes as Markers in Soil Microbial Community Studies
… involved nitrogen-fixing 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 …
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Physiological and nutritional changes in nitrogen fixing trees associated with autumnal senescence and chilling
… The dinitrogen fixing species, actinorhizal (Frankia-nodulated) autumn olive and leguminous black locust (Rhizobium-nodulated), resorbed proportionally more net phosphorus (P) than nitrogen (N) from leaves prior to autumnal leaf abscission than the non-fixing species, sycamore and leguminous …
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Rhizobial infection in nodulation
… bundles resembling nodules from the more ancient Frankia-actinorhizal symbiosis. Using kce and other infection mutants I demonstrate that this abnormal nodule architecture results from a failure of infection to reach the nodule cortex. Based on this finding, I predict that Nod factor activated …
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Biochemical Studies on Enzymatic Treatment of Pulp and Paper Mill Biosludge and Polymeric Lignin
… dye-decolorizing peroxidases (DyPs) FC2591 (from Frankia casuarinae), PF3257 (from Pseudomonas fluorescens), and PR9465 (from Pseudomonas rhizosphaerae). Using structure-based site-directed mutagenesis of FC2591, we identified active site residues essential for oxidase activity against polymeric …
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Physiological and Morphological Responses of Nitrogen-Fixing Red Alder (Alnus Rubra) and Sitka Alder (Alnus Viridis Ssp. Sinuata) to Flooding: Inter- and Intraspecific Comparisons
… tissue on nodule surfaces proximate to the Frankia vesicles in adjacent cells within the nodule. Red alder developed extensive adventitious and new secondary roots during the flood, while sitka alder formed few adventitious roots, lost much of its root and leaf biomass, and showed no …