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.
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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.
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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.