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Actinobacteria constitute an important microbial group and its enzymatic activity contributes to the structuring of soil communities. In this context, the present study tested the effect of abiotic factors on the growth and amylolytic activity of 18 strains of actinobacteria known to facilitate rhizobia isolated from the soil of the Parque Nacional de Ubajara Ceará, a semiarid region of the Northeast of Brazil. The strains were evaluated for their amylolytic activity in different ranges and concentrations of pH and salinity. It was found that the strains showed enzymatic activity, except at pH ENCICLOPÉDIA BIOSFERA, Centro Científico Conhecer Goiânia, v.15 n.27; p. 2018 234 4; linear regression analysis provided a plot showing the highest enzyme production indexes at pH 7 and 2% NaCl concentration. Therefore, the enzymatic activity of these actinobacteria have demonstrated their potential in maintaining the biological processes even under conditions of physiological stress, which are typical characteristics of the soils of semiarid regions.

EFEITO DE FATORES ABIÓTICOS SOBRE A ATIVIDADE ENZIMÁTICA DE ACTINOBACTÉRIAS DE REGIÃO DO SEMIÁRIDO BRASILEIRO