Cry1ac Toxin
Mostrando 1-12 de 47 artigos, teses e dissertações.
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1. Biologia comparada e comportamento de Tetranychus urticae Koch (Acari: Tetranychidae) e Phytoseiulus macropilis (Banks) (Acari: Phytoseiidae) em algodoeiro bollgardTM e Isolinha não-Transgênica
The two spotted spider mite, Tetranychus urticae Koch, is a nontarget herbivore of Bt-cotton, but acquires and accumulates higher levels of Cry toxin than that expressed by transgenic plants. This work investigated the development and reproduction of T. urticae and of the predator Phytoseiulus macropilis Banks, during three successive generations looking for
Neotropical Entomology. Publicado em: 2010-06
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2. Variability and genetic structure of Alabama argillacea (Hüeb.) (Lepidoptera: Noctuidae) populations in Brazil: Basis for managing resistance to Cry1Ac toxin in genetically modified cotton / Variabilidade e estrutura genética de populações de Alabama argillacea (Hüeb.) (Lepidoptera: Noctuidae) no Brasil: subsídios para o manejo da resistência à toxina Cry1Ac em algodão geneticamente modificado
Algodão geneticamente modificado que expressa a toxina Cry1Ac de Bacillus thuringiensis Berliner tem sido plantado no Brasil desde 2006. Entre as pragas-alvo da tecnologia, Alabama argillacea (Hüeb.) é uma espécie monófoga e apresenta alto potencial de risco de evolução da resistência. Para a implantação de um programa de manejo da resistência de
Publicado em: 2010
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3. Effects of genetically modified cotton (Bollgard®) on non-target organisms / Efeitos do algodoeiro geneticamente modificado (Bollgard®) em organismos não-alvo
The effects of the genetically modified cotton (Bollgard®) expressing Bacillus thuringiensis (Bt) Cry1Ac toxin on non-target arthropods was evaluated under laboratory and field studies. Evaluations of arthropod abundance on Bollgard® cotton (Delta Pine 90) and on its isoline (Acala 90) were carried out during three consecutive field seasons. The first stud
Publicado em: 2010
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4. Morphologic and ultrastructural analysis of midgut of Alabama argillacea (Hubner) (Lepidoptera : Noctuidae) front to the toxin Cry1Ac / Análise morfológica e ultra-estrutural do mesêntero de Alabama argillacea (Hubner) (Lepidoptera : Noctuidae) frente à toxina Cry1Ac
Alabama argillacea (Hübner) (Lepidoptera: Noctuidae) é a principal praga desfolhadora da cultura do algodão, provocando perdas entre 21 e 35%. Plantas transgênicas que expressam proteínas tóxicas de genes da bactéria Bacillus thuringiensis (Berliner) (Bt) foram recentemente liberadas no Brasil. O algodão Bt AcalaDTL-90B, que expressa a proteína Cry1
Publicado em: 2009
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5. Adaptabilidade de híbridos entre Gossypium barbadense E G. hirsutum N contendo o gene cry1Ac
Hybrids among transgenic plants and related species are expected to occur if they are sympatric and when there are not crossing barriers; as is the case, in Brazil, of cry1Ac transgenic cotton and Gossypium barbadense. This species has been maintained as dooryard plants, and should be preserved as a genetic resource. Hybrids were evaluated about traits relat
Publicado em: 2009
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6. INTERACTION BETWEEN THE COTTON BOLLGARDTM, THE TWOSPOTED SPIDER MITE, Tetranychus urticae KOCH (ACARI: TETRANYCHIDAE) AND ITS PREDATORY MITE Phytoseiulus macropilis (BANKS) (ACARI: PHYTOSEIIDAE). / INTERAÇÃO ENTRE O ALGODOEIRO BOLLGARDTM, O ÁCARO RAJADO, Tetranychus urticae KOCH (ACARI: TETRANYCHIDAE) E O PREDADOR Phytoseiulus macropilis (BANKS) (ACARI: PHYTOSEIIDAE)
Cotton plants have been genetically transoformed with genes from the bacterium Bacillus thuringiensis Berliner (Bt) which confers the plant resistance against certain lepidopoteran pest species. The Bt-cotton carries genes that express the toxin Cry1Ac. This creates new interactions in the agroecossystems encouraging researches to answer the questions about
Publicado em: 2008
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7. Characterization of the mucosal and systemic immune response induced by Cry1Ac protein from Bacillus thuringiensis HD 73 in mice
The present paper describes important features of the immune response induced by the Cry1Ac protein from Bacillus thuringiensis in mice. The kinetics of induction of serum and mucosal antibodies showed an immediate production of anti-Cry1Ac IgM and IgG antibodies in serum after the first immunization with the protoxin by either the intraperitoneal or intraga
Brazilian Journal of Medical and Biological Research. Publicado em: 2000-02
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8. Control of Resistant Pink Bollworm (Pectinophora gossypiella) by Transgenic Cotton That Produces Bacillus thuringiensis Toxin Cry2Ab
Crops genetically engineered to produce Bacillus thuringiensis toxins for insect control can reduce use of conventional insecticides, but insect resistance could limit the success of this technology. The first generation of transgenic cotton with B. thuringiensis produces a single toxin, Cry1Ac, that is highly effective against susceptible larvae of pink bol
American Society for Microbiology.
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9. Altered binding of the Cry1Ac toxin to larval membranes but not to the toxin-binding protein in Plodia interpunctella selected for resistance to different Bacillus thuringiensis isolates.
Immunoblotting and cytochemical procedures were used to determine whether toxin binding was altered in strains of the Indianmeal moth, Plodia interpunctella, selected for resistance to various strains of Bacillus thuringiensis. Each of these B. thuringiensis subspecies produces a mixture of protoxins, primarily Cry1 types, and the greatest insect resistance
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10. Role of Proteolysis in Determining Potency of Bacillus thuringiensis Cry1Ac δ-Endotoxin
Bacillus thuringiensis protein δ-endotoxins are toxic to a variety of different insect species. Larvicidal potency depends on the completion of a number of steps in the mode of action of the toxin. Here, we investigated the role of proteolytic processing in determining the potency of the B. thuringiensis Cry1Ac δ-endotoxin towards Pieris brassicae (family:
American Society for Microbiology.
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11. Dual Resistance to Bacillus thuringiensis Cry1Ac and Cry2Aa Toxins in Heliothis virescens Suggests Multiple Mechanisms of Resistance
One strategy for delaying evolution of resistance to Bacillus thuringiensis crystal (Cry) endotoxins is the production of multiple Cry toxins in each transgenic plant (gene stacking). This strategy relies upon the assumption that simultaneous evolution of resistance to toxins that have different modes of action will be difficult for insect pests. In B. thuri
American Society for Microbiology.
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12. Importance of Cry1 δ-Endotoxin Domain II Loops for Binding Specificity in Heliothis virescens (L.)
We constructed a model for Bacillus thuringiensis Cry1 toxin binding to midgut membrane vesicles from Heliothis virescens. Brush border membrane vesicle binding assays were performed with five Cry1 toxins that share homologies in domain II loops. Cry1Ab, Cry1Ac, Cry1Ja, and Cry1Fa competed with 125I-Cry1Aa, evidence that each toxin binds to the Cry1Aa bindin
American Society for Microbiology.