Effects of the cultivation of genetically modified Bt crops on nontarget soil organisms - Microbial Ecology in Sustainable Agroecosystems - page 162

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

Bacterial community
structure

Phospholipid
fatty acid
analysis (PLFA)
Community-level
physiological
profiles (CLPP)

Growth
chamber

Soil with two different
Bt maize lines (Events
Bt 11 and TC1507)
and non- Bt maize
isolines

Cry1Ab
Cry1F

No difference in
bacterial community
structure in bulk soil
based on PLFA
profiles
Small effect on
rhizosphere
community structure
using CLPP but
differences primarily
based on soil type

Blackwood
and Buyer
(2004)

Total aerobic culturable
bacteria, the number
of anaerobic
fermentative bacteria,
denitrifying bacteria,
hydrogen-producing
acetogenic bacteria,
and methanogenic
bacteria; enzyme
activity

Culturing
technique

Laboratory Flooded soils amended

with Bt (KMD) and
non- Bt (Xiushui 11)
rice straw

Cry1Ab No toxic effects of

amendment with Bt
rice straw on soil
bacteria

Wu et al.
(2004b)

(continued)