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A two-year field study with transgenic Bacillus thuringiensis maize: effects on soil microorganisms
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Orientador(es)
Resumo(s)
We evaluated the changes of some soil microbiological characteristics due to the use of
transgenic maize expressing Bacillus thuringiensis (Bt) toxin. A two-year field experiment was
conducted (2003 and 2004). Two lines of transgenic Bt maize that express the Cry1Ab protein
(event 176 and MON 810) and their near-isogenic non-Bt lines were used. Rhizosphere and
non-rhizosphere soils were collected and measurements were performed during the maize
cultural cycle and immediately at pre-harvest. Key soil microbiological parameters
measured included the numbers of culturable aerobic bacteria, including actinomycetes,
and fungi, the activity of dehydrogenase and nitrogenase enzymes and ATP content.
There were clear seasonal effects in the microbial parameters as evidenced by the
consistent changes in sampling dates across the two years. Differences in the measured
variables were also observed between rhizosphere and non-rhizosphere soils. However,
under our field conditions, the presence of Bt maize did not cause, in a general way, changes
in the microbial populations of the soil or in the activity of the microbial community
Descrição
Palavras-chave
Bt maize culturable soil microbiota dehydrogenase activity nitrogenase activity ATP content
Contexto Educativo
Citação
"Science of the Total Environment". ISSN 0048-9697. 405 (2008) 351-357