Effects of the cultivation of genetically modified Bt crops on nontarget soil organisms - Microbial Ecology in Sustainable Agroecosystems - page 166

Table 8.3 Summary of Effects of Cultivation of Bt Crops or Amendment with Bt Proteins on Soil Bacteria (continued)
Organism/activity
tested

Bt crop plant/
experimental variable Methodology Study location Protein Effect on bacteria Source

Microbial biomass,
microbial activity

Chloroform
fumigation-
extraction
Nitrogen (N)
mineralization
potential,
short-term
nitrification rate,
and respiration
rate

Field Soil cultivated with Bt

(Event MON863) and
non- Bt maize

Cry3Bb1 No adverse effects of

Bt maize cultivation
detected in bulk or
rhizosphere soil

Devare et al.
(2007)

Microbial communities Biolog

DGGE

Microcosm
Field

Soil amended with Bt
(Merschman
M-0012 Bt ) and non- Bt
maize (Merschman
M-00110)

Not
specified

Bt residue in soil
significantly affected
the structure of
microbial
communities

Fang et al.
(2007)

Soil microbial
community structure

PLFA Greenhouse Soil with 8 paired Bt

and non- Bt maize
lines
Addition of purified Bt
protein to soil

Cry1Ab No effect of Bt maize

on microbial
community structure
No effect of
amendment with
purified Cry1Ab
protein on microbial
community structure

Griffiths,
Heckmann,
et al. (2007)

Nitrogen-fixing bacteria DNA extraction,

cloning, and
sequencing

Field Bt white spruce and

non- Bt spruce

Cry1Ab No negative effect of

Bt cultivar

Lamarche and
Hamelin
(2007)
(continued)