Combined Effect of Sublethal Exposure to Cotton Expressing the Endotoxin Protein of
Bacillus thuringiensis
and Natural Enemies on Survival of Bollworm (Lepidoptera: Noctuidae) Larvae

Mascarenhas, V. J.; Luttrell, R. G.

doi:10.1093/ee/26.4.939

Cited by 40 publications

(18 citation statements)

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“…Johnson and Gould (1992) reported that natural enemies and Bt technology work synergistically to control H. virescens in tobacco. Similarly, Mascarenhas and Luttrell (1997) reported that high densities of natural enemies in BG cotton reduced survival of bollworm. After predator populations were disrupted with broad-spectrum insecticides in BG cotton, increased numbers of lepidopteran larvae survived (Hagerty et al 2000).…”

mentioning

confidence: 95%

Predaceous Arthropods and Lepidopteran Pests on Conventional, Bollgard, and Bollgard Ii Cotton Under Untreated and Disrupted Conditions

et al. 2005

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mentioning

confidence: 95%

Predaceous Arthropods and Lepidopteran Pests on Conventional, Bollgard, and Bollgard Ii Cotton Under Untreated and Disrupted Conditions

et al. 2005

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“…Field and laboratory studies showed that transgenic plants expressing Bacillus thuringiensis Berliner (Bt) Cry proteins afford effective resistance to the larvae of a number of Lepidoptera species. For example, Bt cotton plants are protected against the cotton bollworm, Helicoverpa armigera (Hübner) (Zhao et al 1998;Shelton et al 2002;Deng et al 2003), thus reducing the requirement for multiple insecticide treatments (Mascarenhas and Luttrell 1997) and the risk of pollution from chemical insecticide applications. Cowpea Trypsin Inhibitor (CpTI), a broad-spectrum insect resistant protein, could form an enzyme-inhibitor complex in the midgut of insect when ingested, inhibiting the hydrolyzing activities of the digestive enzymes of insect (Bi et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Effects of repeated cultivation of transgenic Bt cotton on functional bacterial populations in rhizosphere soil

Liu

Zhao

et al. 2008

World J Microbiol Biotechnol

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The impact of multiple-year (0-5 years) cultivation of transgenic Bacillus thuringiensis (Bt) cotton on the functional bacterial populations in rhizosphere soil was investigated. The transgenic Bt ? CpTI cotton line SGK321 and a non-Bt cotton line Shiyuan321 were planted in four fields in which Bt cotton had been continuously cultivated for 0, 1, 3, and 5 years. Rhizosphere soil samples were collected at the seedling, squaring, flower and boll, and boll-opening stages of cotton. Numbers of bacteria involved in nitrogen-fixing, organic phosphate-dissolving, inorganic phosphate-dissolving, and potassium-dissolving were measured with cultivation-dependent approaches. The data presented here showed no consistent statistically significant differences in the numbers of different groups of functional bacteria between rhizosphere soil of Bt and non-Bt cotton in the same field, and no obvious trends in the numbers of the various group of functional bacteria with the increasing duration of Bt cotton cultivation. These studies suggest that multiple-year cultivation of transgenic Bt cotton may not affect the functional bacterial populations in rhizosphere soil.

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“…During sporulation, Bt produces crystals composed of proteins toxic to insects and other organisms, and the proteins produced by different strains of the bacterium are toxic to different species of insects, including various pests. Thus, the genes that encode these toxic proteins are important in agriculture, as the genes introduced into crop plants can render the plants resistant to its pests, thereby decreasing the need for chemical insecticides (Hoffmann et al 1992;Bolin et al 1996;Mascarenhas and Luttrell 1997;Orr and Landis 1997;Schuler et al 1999;Reed et al 2001). Many transgenic crops (e.g., corn, cotton, rice, canola, potato) are now protected against lepidopteran and coleopteran pests because they express the insecticidal toxins from Bt.…”

Section: Introductionmentioning

confidence: 99%

Cry3Bb1 protein from Bacillus thuringiensis in root exudates and biomass of transgenic corn does not persist in soil

Icoz

Stotzky

2007

Transgenic Res

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The Cry3Bb1 protein, insecticidal to the corn rootworm complex (Diabrotica spp.), of Bacillus thuringiensis (Bt) subsp. kumamotoensis was released in root exudates of transgenic Bt corn (event MON863) in sterile hydroponic culture (7.5 +/- 1.12 ng/ml after 28 days of growth) and in nonsterile soil throughout growth of the plants (2.2 +/- 0.62 ng/g after 63 days of growth). Kitchawan soil, which contains predominantly kaolinite (K) but not montmorillonite (M), was amended to 3 or 6% (vol./vol.) with K (3K and 6K soils) or M (3M and 6M soils) and with 1, 3, 5, or 10% (wt./wt.) of ground biomass of Bt corn expressing the Cry3Bb1 protein and incubated at 25 +/- 2 degrees C at the -33-kPa water tension for 60 days. Soils were analyzed for the presence of the protein every 7 to 10 days with a western blot assay (ImmunoStrip) and verified by ELISA. Persistence of the protein varied with the type and amount of clay mineral and the pH of the soils and increased as the concentration of K was increased but decreased as the concentration of M was increased. Persistence decreased when the pH of the K-amended soils was increased from ca. 5 to ca. 7 with CaCO(3): the protein was not detected after 14 and 21 days in the pH-adjusted 3K and 6K soils, respectively, whereas it was detected after 40 days in the 3K and 6K soils not adjusted to pH 7. The protein was detected for only 21 days in the 3M soil and for 14 days in the 6M soil, which were not adjusted in pH. These results indicate that the Cry3Bb1 protein does not persist or accumulate in soil and is degraded rapidly.

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Combined Effect of Sublethal Exposure to Cotton Expressing the Endotoxin Protein of Bacillus thuringiensis and Natural Enemies on Survival of Bollworm (Lepidoptera: Noctuidae) Larvae

Cited by 40 publications

References 0 publications

Predaceous Arthropods and Lepidopteran Pests on Conventional, Bollgard, and Bollgard Ii Cotton Under Untreated and Disrupted Conditions

Predaceous Arthropods and Lepidopteran Pests on Conventional, Bollgard, and Bollgard Ii Cotton Under Untreated and Disrupted Conditions

Effects of repeated cultivation of transgenic Bt cotton on functional bacterial populations in rhizosphere soil

Cry3Bb1 protein from Bacillus thuringiensis in root exudates and biomass of transgenic corn does not persist in soil

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