Abstract

ROJAS, Marcia M.; RODRIGUEZ, Anar J.; TRUJILLO, Iván D.  and  HEYDRICH, Mayra. Relationships between nitrogen fixation and auxins production in Gluconacetobacter diazotrophicus strains from different crops. Rev. colomb. biotecnol [online]. 2009, vol.11, n.1, pp.84-93. ISSN 0123-3475.

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.

Keywords : Gluconacetobacterdiazotrophicus; auxins; nitrogen fixation.

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