Efeito da queimada sobre a atividade de enzimas hidrolíticas de actinobactérias de região semiárida do Ceará

Abstract

The soil ensures the provision of several ecosystem services, having a rich biodiversity of microorganisms that interact in order to ensure its formation. Among these microorganisms, actinobacteria are known for their wide production of secondary metabolites with ecological and biotechnological potential. The emergence of forest fires or fires caused by anthropic activities can result in negative effects on the soil microbial community leading to its degradation. In order to train firefighters and evaluate the effects of forest fires on the Caatinga ecosystem the National Center for Prevention and Control of Forest Fires (Prevfogo) held together with the specialized brigade combat of forest fires (Brif / Caatinga) a fire simulation in the semi-arid region of the municipality of Quixeramobim (Ceará). Soil samples were collected in order to evaluate the effect of high temperature on the actinobacteria community before and after the burning. It was carried out the cultural characterization and hydrolytic enzymes activity essay using amylase, cellulase and xylanase on 20 strains of actinobacteria. All strains showed amylolytic activity, 14 strains showed cellulolytic activity and 10 strains showed xylanolytic activity. It can be inferred, by statistical analysis, the decrease of the amylolytic activity in the period after the burning and increase of the cellulolytic and xylanolytic activities after the burning. By grouping the data of the enzymatic indices it was possible to observe the enzymatic potential of the strains in the period after the burning.