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| Registros recuperados: 13 | |
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| Muzaffar,Adnan; Kiani,Sarfraz; Khan,Muhammad Azmat Ullah; Rao,Abdul Qayyum; Ali,Arfan; Awan,Mudassar Fareed; Iqbal,Adnan; Nasir,Idrees Ahmad; Shahid,Ahmad Ali; Husnain,Tayyab. |
| BACKGROUND: Insects have developed resistance against Bt-transgenic plants. A multi-barrier defense system to weaken their resistance development is now necessary. One such approach is to use fusion protein genes to increase resistance in plants by introducing more Bt genes in combination. The locating the target protein at the point of insect attack will be more effective. It will not mean that the non-green parts of the plants are free of toxic proteins, but it will inflict more damage on the insects because they are at maximum activity in the green parts of plants. RESULTS: Successful cloning was achieved by the amplification of Cry2A, Cry1Ac, and a transit peptide. The appropriate polymerase chain reaction amplification and digested products confirmed... |
| Tipo: Journal article |
Palavras-chave: Chloroplast transient peptide; Cry1Ac; Cry2A; Bt; CTP; Cry genes; Endotoxins; GUS; Transgenic plants. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100014 |
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| Polanczyk,Ricardo Antonio; Zanúncio,José Cola; Alves,Sérgio Batista. |
| The soil and other substrates such as mushroom compounds are the main sources of new Bacillus thuringiensis (Bt) isolates for Integrated Pest Management programs. This study describes the relationship between chemical properties of the soil (pH, OM, P3+, K1+, Ca2+, Mg2+, H1++Al3+, B3+, Cu2+, Fe2+, Mn2+ and Zn2+) and the occurrence of Bt in Brazil. A total of 1,197 bacterial colonies were obtained, being 512 of them identified as Bt. The Bt index (iBt), which is the relation between Bt colonies and bacterial counts ranged from 0.18 to 0.86. The iBt may be expressed with the formula: iBt= -0.4 + 0.6Ca2+ + 0.07Cu2+ + 0.009Fe2+ - 0.53Mg2+ -0.12Mn2+ + 1.26Zn2+. A cluster of samples with fewer colonies and a high negative correlation (antagonism) between Mn2+... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bt; Chemical elements; Entomopathogen; Soil; Biological control. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782009000100001 |
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| Bobrowski,Vera Lucia; Fiuza,Lidia Mariana; Pasquali,Giancarlo; Bodanese-Zanettini,Maria Helena. |
| Os insetos constituem uma das principais causas de danos à produção agrícola no mundo. O controle de insetos tem sido realizado por meio de agroquímicos e, em muito menor escala, pelo emprego de inseticidas biológicos. As plantas transgênicas resistentes a insetos representam uma nova alternativa no combate aos insetos-praga das lavouras. A bactéria entomopatogênica Bacillus thuringiensis Berlinier (Bt) é a fonte dos genes de resistência nas chamadas plantas-Bt, produzidas comercialmente. No presente trabalho de revisão, são abordados os aspectos relacionados à bactéria Bt como fonte de genes de resistência a insetos-pragas, plantas geneticamente modificadas, vantagens do uso de plantas-Bt, bem como perspectivas dessa ferramenta biotecnológica. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacillus thuringiensis; Bt; Plantas transgênicas; Resistência a insetos; Insetos-praga; Delta-endotoxina. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782003000500008 |
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| Dun, Zhe; Mitchell, Paul D.. |
| Transgenic plants producing insecticidal protein derived from Bacillus thuringiensis (Bt) have been widely adopted since their commercial introduction in 1996. In 2009, 25 countries planted 134 million ha of transgenic crops. The widespread adoption of such plants has reduced use of conventional insecticides while attaining yield gains, thus providing economic, environmental and human health benefits. Because of Bt crops’ high pest control efficacy, there is concern that pests will develop resistance to Bt toxins so that Bt crops are less or no longer effective. To delay the evolution of resistance, the U.S. Environmental Protection Agency (EPA) currently requires Bt crop growers to also plant non-Bt (conventional) crops on a minimum percentage of their... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Welfare; Bt; Pest suppression; Agricultural and Food Policy; Crop Production/Industries. |
| Ano: 2011 |
URL: http://purl.umn.edu/103584 |
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| Costa,A. C. S. da; Libardi,P. L.. |
| Em Terra Roxa Estruturada Latossólica do município de Piracicaba (SP), foram instalados tensiômetros a cada 15 cm, em triplicata, a partir de 30 cm até à profundidade de 240 cm, numa área de 25 m², para medida do potencial mátrico (φm) e, indiretamente, por meio da curva de retenção de água, a umidade volumétrica (θ). O método da umidade (Libardi et al., 1980) ajustou os dados de redistribuição de água (θ vs t) com coeficientes de determinação (R²) maiores que 0,98. A hipótese de gradiente do potencial hidráulico (δφh δz-1) unitário foi verificada somente no horizonte Bw. No horizonte Bt, o gradiente do potencial hidráulico variou de 1 a 3,89 m m-1, o que determinou valores de condutividade hidráulica maiores que os obtidos pelo método de Hillel et al.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Morfologia; Estrutura; Porosidade; Condutividade hidráulica; Bt; Bw. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06831999000300021 |
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| Freitas,Josiane Garcia de; Takahashi,Tamara Akemi; Figueiredo,Lara L.; Fernandes,Paulo M.; Camargo,Luiza Figueiredo; Watanabe,Isabela Midori; Foerster,Luís Amilton; Fernandez-Triana,José; Shimbori,Eduardo Mitio. |
| ABSTRACT This is the first report of Cotesia scotti (Valerio and Whitfield) comb. nov. in Brazil, attacking larvae of the black armyworm, Spodoptera cosmioides, and the southern armyworm, S. eridania. The moth larvae were found respectively, infesting a protected cropping of organic tomato in Hidrolândia, Goiás, Brazil, and a transgenic soybean crop in São José dos Pinhais, Paraná, Brazil. Biological, molecular and morphological characters were used to confirm the identity of the specimens. Parasitoid identification presented a challenge since the species has most diagnostic characters of the genus Cotesia Cameron, but few in the poorly defined genus Parapanteles Ashmead. Based on morphological and molecular evidence, we transfer Parapanteles scotti to the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biological control; Bt; Parasitoid; Pest; Taxonomy. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262019000300238 |
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| Bertolaccini,Isabel; Bouzo,Carlos; Larsen,Nicholas; Favaro,Juan C.. |
| Los maíces dulces Bt son atacados por especies del género Euxesta Loew, antes consideradas como plagas secundarias, lo que provoca daños severos en los maíces dulces del cinturón hortícola santafesino. Se han identificado dos especies del género, E. mazorca Steykal y E. eluta Loew, que aparecen en forma simultánea y causan severas pérdidas. En los ataques, las larvas comienzan a dañar los estigmas, luego se produce el vaciado de los granos, especialmente los apicales, aunque el daño pueden extenderse a toda la espiga. La acción de estas larvas constituye además una vía de ingreso de microorganismos saprofíticos, lo que se traduce en la pérdida del producto e impide su comercialización para consumo directo. El género Dettmeria Borgmeier (Hymenoptera:... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Maíz; Bt; Plagas; Euxesta; Dettmeria. |
| Ano: 2010 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0373-56802010000100012 |
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| Registros recuperados: 13 | |
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