relación de la fijación de nitrógeno y la producción de auxinas en cepas de gluconacetobacter diazotrophicus procedentes de diferentes cultivos
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ID: 140492
2009
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Abstract
Se determinó la capacidad de fijar nitrógeno mediante la actividad reductora de acetileno para 8 cepas de G. diazotrophicus aisladas de diferentes ecosistemas empleando el medio LGI-P. Además, se determinó la producción de auxinas a través del método de Salkowski y se analizó la influencia del aminoácido triptófano y del AIA en la actividad de la nitrogenasa. El triptófano, al igual que otros aminoácidos y las diferentes concentraciones de AIA, inhiben en distinta medida la actividad de la enzima solo parcialmente. Se demostró que las condiciones de nitrofijación no afectan la producción de AIA en esta bacteria. Esta relación entre ambas capacidades fisiológicas beneficiosas para los cultivos agrícolas pudiera tener gran importancia ya que pueden desarrollarse paralelamente, y potenciar la acción beneficiosa hacia la planta, basada en la dinitrofijación y la producción de auxinas estimuladoras del crecimiento vegetal. The capacity to fix nitrogen of 8 strains of G. diazotrophicus from different ecosystems was determined by acetylene reduction assay using LGIP medium. Moreover, auxins production was determined by Salkowski’s method and the influence of triptophan and indoleacetic acid (IAA) in the nitrogenase activity were analyzed. The triptophan as other aminoacids and different concentrations of IAA, inhibit at different levels the nitrogen fixation only partially. There were demonstrated that the nitrogen fixation conditions do not affect the auxins production of this bacteria. This relationship between both crop beneficial physiological capacities should be a great importance since they may be parallely developed, and enhance the beneficial action to the plant, based on dinitrogen fixation and stimulating plant growth auxins production.
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rojas2009revistarelacin
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| Authors | ;Marcia M. Rojas;Anar J. Rodríguez;Iván D. Trujillo;Mayra Heydrich |
| Journal | gigascience |
| Year | 2009 |
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| Keywords | Keywords not found |
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