-The objective of this work was to assess the effect of two strains of Bacillus thuringiensis var. kurstaki on sorghum rhizosphere microorganisms. The strains were HD1, that produces the bioinsecticidal protein, and 407, that is a mutant non-producer. The strains do not influence microbial population, but reduce plant growth and improve mycorrhizal colonization and free living fixing N 2 community.Index terms: bioinsecticide, sorgum, rhizosphere, biocontrol.
Efeito do Bacillus thuringiensis sobre grupos funcionais de microrganismos na rizosfera de sorgoResumo -O objetivo deste trabalho foi avaliar o efeito de duas cepas de Bacillus thuringiensis var. kurstaki sobre microrganismos na rizosfera do sorgo. As cepas foram a HD1, produtora do cristal bioinseticida, e a 407, uma mutante não-produtora. As duas cepas não influenciam a comunidade microbiana, mas reduzem o crescimento da planta. A colonização micorrízica e a população de fixadores de N 2 de vida livre aumentaram.Termos para indexação: bioinseticida, sorgo, rizosfera, controle biológico.
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