Abstract

SANCHEZ-YANEZ, Juan Manuel et al. Survival of Azotobacter and other microbial group in dry soil by storage. J. Selva Andina Res. Soc. [online]. 2022, vol.13, n.1, pp.3-15. ISSN 2072-9294.  https://doi.org/10.36610/j.jsars.2022.130100003.

In dry soils, the survival of the genus and species of Azotobacter is parallel to that of other native microbial groups such as actinomycetes and fungi of that environment, depending on the genetic adaptation capacity of each one, in combination with some of the physicochemical properties of the soil. soil, and environmental storage conditions. The objectives of this work were: i) to analyze the survival of Azotobacter in soil recently collected and stored for 11 and 30 years ii) to biochemically characterize Azotobacter vinelandii isolated from these soils iii) survival dynamics of actinomycetes, bacteria and fungi in soils. For which each of the soils was kept for a different period of time in sterile glass containers at room temperature, from there they were diluted to quantify each group in: nutrient agar for bacteria, casein starch agar for actinomycetes, Rose Bengal agar for fungi and Burk agar for Azotobacter. The results showed that the number of surviving Azotobacter in soil stored for 30 years was 12 x106 CFU/g, 52 x 106 CFU/g in dry soil for 11 years, and 300 x106 CFU/g in freshly collected dry soil. In the soil of 30, 11 years, a density of Azotobacter was detected, lower than the dry soil recently collected. A difference was found in the biochemical profiles of A. vinelandii from soil stored for 30 years, compared to the same genus and species in the newly collected soil. The above indicates that the physicochemical properties of the soil, the drying period was critical in the survival of Azotobacter and other groups of microorganisms native to that environment.

Keywords : Soil; storage; cysts; microbial diversity.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )