Extractable soil lipids and microbial activity as affected by Bt and non Bt maize grown on a silty clay loam soil.
J Environ Sci Health B
; 38(2): 211-9, 2003 Mar.
Article
en En
| MEDLINE
| ID: mdl-12617558
Pyrolysis-gas (Py-GC) chromatography was used to characterize extractable lipids from Bt and non-Bt maize shoots and soils collected at time of harvesting. Py-GC-MS (mass spectrometry) showed that the concentrations of total alkenes identified in non-Bt shoots and soils were 47.9 and 21.3% higher than in Bt maize shoots and soils, respectively. N-alkanes identified were of similar orders of magnitude in Bt and non-Bt maize shoots, but were 28.6% higher in Bt than in non-Bt soils. Bt maize shoots contained 29.7% more n-fatty acids than non-Bt maize shoots, whereas the concentrations of n-fatty acids in Bt soils were twice as high as those in non-Bt soils. Concentrations of unsaturated fatty acids in Bt maize shoots were 22.1% higher than those in non-Bt maize shoots, while concentrations of unsaturated fatty acids were 22.5% higher in non-Bt than in Bt soils. The cumulative CO2-C evolved from soils under Bt and non-Bt crops was 30.5% lower under Bt as compared to non-Bt crops, whereas when maize shoots were added to Bt and non-Bt soils, the decrease in CO2-C evolved were 16.5 and 23.6%, respectively. Our data showed that the cultivation of Bt maize significantly increased the saturated to unsaturated lipid ratios in soils which appeared to negatively affect microbial activity.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Suelo
/
Plantas Modificadas Genéticamente
/
Zea mays
/
Ácidos Grasos Insaturados
Idioma:
En
Revista:
J Environ Sci Health B
Año:
2003
Tipo del documento:
Article
País de afiliación:
Canadá
Pais de publicación:
Reino Unido