Abstract
The Caatinga, also known as semi-arid, is the only Brazilian biome, still little explored, that presents microorganisms and plant species highly resistant to the long periods of drought, commenced by the local climate. The phylum Actinobacteria can be considered as one of the most abundant in the Brazilian semiarid soil, Actinobacteria, or Actinomycetes, are gram-positive, filamentous bac…