AISLAMIENTO DE RHIZOBIUM PDF

After cereals, legumes constitute the second most important family of crops for human and animal consumption. However, in contrast to the former, legumes are capable of growing in arid soils of low fertility, due to their ability to establish symbiotic associations with soil bacteria called rhizobia. These microorganisms form special organs in the roots of legumes called nodules, where atmospheric dinitrogen N 2 is transformed into ammonium that is exported to the plant for growth. Since their discovery in legume nodules until today, knowledge of the bacteria capable of establishing symbiosis with these plants has advanced in many aspects. Especially, advances in molecular techniques for bacterial identification and access to unexplored places have confirmed that the interaction of legumes with rhizobia is older, and that N 2 -fixing bacteria are more abundant and diverse, than considered previously. Here, we attempt to relate the history of an association whose development is key in the history of mankind as we know it now.

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After cereals, legumes constitute the second most important family of crops for human and animal consumption. However, in contrast to the former, legumes are capable of growing in arid soils of low fertility, due to their ability to establish symbiotic associations with soil bacteria called rhizobia. These microorganisms form special organs in the roots of legumes called nodules, where atmospheric dinitrogen N 2 is transformed into ammonium that is exported to the plant for growth.

Since their discovery in legume nodules until today, knowledge of the bacteria capable of establishing symbiosis with these plants has advanced in many aspects.

Especially, advances in molecular techniques for bacterial identification and access to unexplored places have confirmed that the interaction of legumes with rhizobia is older, and that N 2 -fixing bacteria are more abundant and diverse, than considered previously.

Here, we attempt to relate the history of an association whose development is key in the history of mankind as we know it now. Arbor , : a Barcelona: Planeta. Desde los inicios de la agricultura en las distintas partes del mundo, las principales cosechas las constituyen los cereales y las leguminosas. Los informes de FAO Madrid: McGraw-Hill Interamericana. Milestones in Microbiology.

The Development of Microbiology. Cambridge, London: Cambridge University Press. Barcelona: Ediciones Omega. Estos descubrimientos constituyeron una poderosa herramienta para el estudio de distintos grupos microbianos y dio origen a numerosos descubrimientos que, a su vez, sentaron las bases para nuevas investigaciones.

Journal die Landwirtschaft , 33, pp. Fueron Hellriegel y Wilfarth, en Hellriegel, H. Todos las bacterias aisladas por Beijerinck en Beijerinck, M. Botanishe Zeitung , 46, pp. Ueber die Pilzsymbiose der Leguminosen.

Berichte der Deutschen Chemischen Gesellschaft , 7, pp. Landwirtschaflichen Versuchsstat , 37, pp. Nomenclature of the root-nodule bacteria of Leguminosae. Journal of Bacteriology , 17, pp. Dicho de otra manera, el nutriente fundamental para el desarrollo vegetal y el de todos los seres vivos, es transformado de una forma inerte N 2 en formas asimilables por los organismos, con lo que se mantiene el equilibrio de los ecosistemas.

Cohn Cohn, F. Untersuchungen ueber Bakterien. Beitraege zur Biologie der Planzen. En Brock, T. System der Bakterien. Handbuch der Morphologie, entwicklungsgeschichte und systematik der bakterien volume 1. Nomenclature of the Coccaceae. Journal of Infectious Diseases , 17, pp. Phylogenetic structure of the procaryotic domain: The primary kingdoms. Proceedings of the National Academy of Sciences of U.

Bacterial asociations with legumes. Transformation mechanisms of Rhizobia. Transducing phages of Rhizobium meliloti. Acta Microbiologica Polonica , 16, pp. Transfer of clover infectivity of Rhizobium trifolii to Rhizobium phaseoli as mediated by an episomic factor.

Journal of General and Applied Microbiology , 13, pp. Nuti, en Nuti, M. Large plasmids in diferent Rhizobium species. Journal of General Microbiology , , pp. Nucleotide sequence of Rhizobium meliloti nitrogenase reductase nifH gene. Nucleic Acids Research , 9, pp. En Downie, J. Identification of genes and gene products involved in the nodulation of peas by Rhizobium leguminosarum.

Molecular General Genetics , , pp. A plant flavone, luteolin, induces expression of Rhizobium meliloti nodulation genes. Science , , pp.

Host specific regulation of nodulation genes in Rhizobium mediated by a plant-signal, interacting with the nodD product. EMBO Journal , 6, pp. Rhizobium meliloti nodA and nodB genes are involved in generating compounds that stimulate mitosis of plant cells. Rhizobium meliloti host range nodH gene determines production of an alfalfa-specific extracellular signal.

Journal of Bacteriology , , pp. Subcellular localization of the nodD gene product in Rhizobium leguminosarum. A novel exopolysaccharide can function in place of the calcofluor-binding exopolysaccharide in nodulation of alfalfa by Rhizobium meliloti.

Cell , 56, pp. Symbiotic host specificity of Rhizobium meliloti is determined by a sulphated and acylated glucosamine oligosaccharide signal. Nature , , pp. Stress tolerance in Rhizobium and Bradyrhizobium, and nodulation under adverse soils conditions.

Canadian Journal of Microbiology , 38, pp. Genetic map of Rhizobium meliloti megaplasmid pRme SU47b. Molecular Microbiology , 5, pp. Broad-host-range Rhizobium species strain NGR secretes a family of carbamoylated, and fucosylated, nodulation signals that are O-acetylated or sulphated. Molecular Microbiology , 6, pp. Mutational analysis of the Rhizobium meliloti nifA promoter. Molecular basis of symbiosis between Rhizobium and legumes. Journal of Biological Chemistry , , pp.

Legumes symbioses: absence of nod genes in photosynthetic bradyrhizobia. Correlated physical and genetic map of the Bradyrhizobium japonicum genome. Physical map of the genome of Rhizobium meliloti En Yanni, Y. Natural endophytic association between Rhizobium leguminosarum bv. Plant and Soil , , pp. Rhizobia inoculation improves nutrient uptake and growth of lowland rice.

Soil Science Society American Journal , 64, pp. Rhizobium promotes non-legumes growth and quality in several production steps: towards a biofertilization of edible raw vegetables healthy for humans. Molecular systematics of rhizobia based on maximum likelihood and Bayesian phylogenies inferred from rrs, atpD, recA and nifH sequences, and their use in the classification of Sesbania microsymbionts from Venezuelan wetlands.

Systematic and Applied Microbiology , 28, pp. International Journal of Systematic and Evolutionary Microbiology , 58, pp. Symbiovars in rhizobia reflect bacterial adaptation to legumes. Systematic and Applied Microbiology , 34, pp. Recibido: ; Aceptado: Agron, P. Balassa, R. Balassa, G. Genetic transformation in Rhizobium: A review of the work of R.

Bacteriological Reviews , 27, pp. Baldwin, I. Bedmar, E. Beijerinck, M. Biswasa, J. Brock, T. Englewood Cliffs: Prentice-Hall. Buchanan, R. Charles, T.

EQUILIBRIO EN LA VIDA CRISTIANA RYRIE PDF

EP0292984A2 - Gène cloné ntrA (rpoN) de rhizobium meliloti - Google Patents

Biological fixation of nitrogen by native isolates of Rhizobium sp. De Wit. Forage legumes such as Leucaena leucocephada, besides being a rich source of protein for animal feed, its inclusion in silvopastoral systems provides fundamental components to improve soil properties. These plants have the ability to establish symbiotic association with the genus Rhizobium sp. The objective of this research was to evaluate the capacity of native isolates of Rhizobium sp. Two separate bioassays to evaluate the efficiency of the FBN of the native isolates and the commercial strain under greenhouse conditions, followed by a randomized complete block design with 7 x 2 factorial arrangement, seven treatments, two factors: native isolates and commercial strains and bacterial concentrations 10 6 and 10 8 cells. In the second bioassay with day-old seedlings, the same variables of the first bioassay were determined, with the exception of the percentage of germination.

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Isolation and characterization of rhizobia strains isolated from different legumes in the Cascajal region, Villa Clara. Pastos y Forrajes [online]. ISSN Nineteen rhizobium strains were isolated from the nodules of the legumes Canavalia ensiformis , Stylosanthes guianensis , Centrosema molle , Pueraria phaseoloides and Macroptilium atropurpureum , with the objective of obtaining effective inoculants for such crops in acid soils.

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