Efeito do algodão geneticamente modificado resistente a insetos sobre a população de bactérias do solo

Abstract

This study aimed to evaluate the influence of cultivation of two varieties of Gossypium hirsutum L., being a non-Bt and Bt varieties on the dynamics of soil bacterial population in the municipality of Dourados, Mato Grosso do Sul, Brazil. Soil samples were collected before sowing of the crop and during the plant development, which covered the period of December 2009 to May 2010, for quantitative, chemical and physical analysis; for molecular characterization was used only collection relating to the last sample, i.e. at 150 days after sowing. Soil samples were sent separately to the soil laboratory of the Faculty of Agricultural Sciences and Microbiology, Faculty of Biological and Environmental Sciences of UFGD and the biotechnology laboratory at the campus of UNESP Jaboticabal for analyzing the chemical and physical factors of soil quantification of bacterial population and molecular characterization, respectively. The results concerning quantification revealed that bacterial populations were significant different when compared during the months of evaluation, but not in relation to the type of cultivation, compared the chemical characteristics of soil planted with Bt cotton showed significant differences in some parameters such as pH showing better characteristics in the molecular characterization, however did not show significant variations.