Prospecção de actinobactérias do semiárido com potencial biotecnológico como biofertilizantes

Abstract

The particular semi-arid region is remarkably rich in biodiversity and is home to organisms with survival characteristics in adverse situations. There is still a gap to be explored, despite not having the ability to be tested in biotechnological applications in agriculture. Among these, actinobacteria with their recognized ability to produce secondary metabolites as a highlight of biofertilizers. The objective of this study was to analyze the capacity of 36 strains of actinobacteria from the semi-arid region of Ceará with regard to the production capacity of indole acetic acid and phosphate solubilization, both important for the promotion of the plant. The isolates were analyzed for phosphate solubilization in Pikovskaya and Katznelson and Bose solid media and colori method using Ca3(PO4)2 as a source of insoluble phosphate. To measure the ability of bacteria to produce AIA, the colorimetric method was used with commercial indole acetic acid as a reference. The examples show with a lower precision compared to the tested ones, 23 were prepared in phosphate plate and 18 in PVK medium, solving values from 1.06 to 1.5 and 1.11 to 1.84 respectively. Outliers from the total of 3 solubilizer numbers as produced with the

colorimetric method with the amount of phosphorus between 1.25 and 37.18 μg.mL-1. With regard to the production of AIA 29, the trend was this variation in concentration between 0.54-6.37 µg.mL-1. The present work contributes to the investigation of actinobacteria with biotechnological potential to act as plant growth-promoting rhizobacteria. And, through this, it was concluded that actinobacteria from the semiarid region have potential for use in the formulation of biofertilizers.