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| Registros recuperados: 19 | |
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| MATALLO, M. B.; FRANCO, D. A. S.; ALMEIDA, S. D. B.; MOURA, M. A.; CERDEIRA, A. L.; QUEIROZ, S. C. do N. de; MORAES, R. de O.; DUKE, S. O.; SILVA, D. F. P. da. |
| O ácido chiquímico é um indicador da intoxicação das plantas por glifosate. Apesar de inativado no solo, há indícios de que esse herbicida pode ser liberado pelas raízes das plantas tratadas sendo, posteriormente, absorvido por outras plantas. O objetivo desse trabalho foi verificar a exsudação do glifosate a partir de plantas de soja RR e sua posterior absorção por soja convencional, ambas cultivadas em sistema hidropônico. Os resultados mostraram que houve exsudação do glifosate e de seu metabolito ácido aminometilfosfônico (AMPA) pela soja RR na solução nutritiva e posterior absorção do herbicida, indicada pelo acúmulo do ácido chiquímico nas plantas de soja convencional. Comprova-se a exsudação e posterior absorção do glifosate, entretanto, relacionar... |
| Tipo: Separatas |
Palavras-chave: Ácido chiquímico.; Rizosfera.. |
| Ano: 2009 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/577647 |
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| CERDEIRA, A. L.; SILVA, F. M. L.; DONEGA, M. A.; CORNIANI, N.; VELINI, E. D.; CANTRELL, C. L.; DAYAN, F. E.; COELHO, M. N.; SHEA, K.; DUKE, S. O.. |
| Tipo: Separatas |
Palavras-chave: Aplotaxene; Aleloquímicos; Carduus. |
| Ano: 2014 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1004764 |
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| FRANCO, D. A. S.; ALMEIDA, S. D. B.; CERDEIRA, A. L.; DUKE, S. O.; MORAES, R. M.; LACERDA, A. L. S.; MATALLO, M. B.. |
| Resumo: Com o aumento da comercialização de culturas geneticamente modificadas (GM) resistentes ao glyphosate, é importante investigar a relação entre o uso desse herbicida e seus efeitos no crescimento e desenvolvimento de plantas de soja GM, assim como sua relação com o ácido chiquímico. Nesse sentido, foi conduzido um ensaio de campo e outro em casa de vegetação, com o objetivo de verificar a influência do glyphosate no crescimento, no desenvolvimento e na qualidade dos grãos da soja GM, bem como sua exsudação radicular e posterior absorção por plântulas de soja convencional cultivada sob condições hidropônicas. O ensaio de campo foi realizado em Eng. Coelho-SP, em 2007/08, sob delineamento de blocos ao acaso com quatro repetições, com aplicações... |
| Tipo: Separatas |
Palavras-chave: Chiquimato; Transgenia; Exsudação radicular; AMPA; Hidroponia; Glifosato; Planta transgênica; Soja; Herbicida; Exsudação; Transgenic plants; Soybeans; Glyphosate; Exudation. |
| Ano: 2012 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/936566 |
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| QUEIROZ, S. C. do N. de; CANTRELL, C. L.; DUKE, S. O.; MORAES, R. M.; CERDEIRA, A. L.; NANDULA, V.. |
| Horseweed [Conyza canadensis (L.) Cronquist, syn. Erigeron canadensis L.], Asteraceae, is a common weed with known allelopathic effects but few studies on the isolation and identification of the phytotoxic compounds have been reported [1]. C. canadensis infests orchards, vineyards, field crops such as corn, soybean and cotton, particularly in herbicide-resistant crops where conservation tillage or no-till systems are used. The objective of this study was to identify the phytotoxic compounds present by systematically performing bioassay-directed isolation and subsequent identification of the bioactive constituents according to Dayan et al. [2]. No significant phytotoxic activity against Lactuca sativa or Agrostis stolonifera was detected in methanol, or... |
| Tipo: Parte de livro |
Palavras-chave: Phytotoxic terpenoids; Horseweed.; Conyza canadensis.. |
| Ano: 2012 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/956433 |
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| CERDEIRA, A. L.; DUKE, S. O.. |
| Transgenic glyphosate-resistant crops (GRCs) have been com- mercialized and grown extensively in the western Hemisphere and, to a lesser extent, elsewhere. GRCs have generally become dominant in those countries where they have been approved for growing. Potential effects of glyphosate on soil and water are minimal, compared to the effects of the herbicides that are re- placed when GRCs are adopted. Perhaps the most important indirect effect is that GRCs crops promote the adoption of re- duced- or no-tillage agriculture, resulting in a signifcant reduc- tion in soil erosion and water contamination. Glyphosate and its degradation product, aminomethylphosphonate (AMPA), residues are not usually detected in high levels in ground or surface water in areas where... |
| Tipo: Separatas |
Palavras-chave: Resistência a herbicida; Herbicide-resistant crops; Glyphosate; Soil; Water; Environment. |
| Ano: 2010 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/872430 |
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| CERDEIRA, A. L.; GAZZIERO, D. L. P.; DUKE, S. O.. |
| Glyphosate-resistant soybeans (GRS) effects on contamination of soil, water, and air are minimal, compared to those caused by the herbicides that they replace when GRS are adopted. Transgenes encoding glyphosate resistance in soybeans are highly unlikely to be a risk to wild plant species in Brazil. GRS resulted in a significant shift to no-tillage practices, but weed resistance may reduce this trend. Probably the highest agricultural risk in adopting GRS in Brazil is related to weed resistance due to use of glyphosate. Weed species in GRS fields have shifted in Brazil to those that can more successfully withstand glyphosate or to those that avoid the time of its application. These include Chamaesyce hirta, Commelina benghalensis, Digitaria insularis,... |
| Tipo: Separatas |
Palavras-chave: Impacto ambiental; Soja; Planta Transgênica.; Soybeans; Environmental impact; Transgenic plants. |
| Ano: 2010 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/879611 |
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| VELINI, E.; ALVES, E.; GODOY, M. C.; MESCHEDE, D. K.; SOUZA, R. T. de; DUKE, S. O.. |
| BACKGROUND:Glyphosate blocks the shikimic acid pathway, inhibiting the production of aromatic amino acids and several secondary compounds derived from these amino acids. Non-target plants can be exposed to low doses of glyphosate by herbicide drift of spray droplets and contact with treated weeds. Previous studies have reported that low doses of glyphosate stimulate growth, although these data are very limited. The objective of this study was to determine the effects of low glyphosate doses on growth of a range of plant species. RESULTS:Growth of maize, conventional soybean, Eucalyptus grandis Hill ex Maiden, Pinus caribea L. and Commelia benghalensis L. was enhanced by 1.8-36 g glyphosate ha-1. Growth of glyphosate-resistant soybean was unaffected by any... |
| Tipo: Artigo de periódico |
Palavras-chave: Glifosato; Crescimento vegetativo; Agricultura; Agrotóxico; Eucalipto; Herbicida; Milho; Soja; Pinus. |
| Ano: 2008 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/543207 |
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| DUKE, S. O.; CERDEIRA, A. L.; MATALLO, M. B.. |
| To be effective, herbicides they must have strong biological activity against plants. Indirectly through their effects on plants, herbicides can influence almost any process or interaction of the plant, including its susceptibility to plant diseases. In some cases, herbicides also have direct effects on plant pathogens. In this short review, we will discuss both types of effect, and, where possible, provide the mechanism for the effect. We provide a separate section for glyphosate because of the relatively large amount of information on the effects of this very important herbicide on plant diseases and the fact that there have been many seemingly conflicting claims of the effect of glyphosate on diseases in glyphosate-resistant crops (Duke & Cerdeira,... |
| Tipo: Separatas |
Palavras-chave: Herbicida; Doença de planta. |
| Ano: 2006 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1026544 |
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| MATALLO, M. B.; ALMEIDA, S. D. B.; CERDEIRA, A. L.; FRANCO, D. A. S.; BLANCO, F. M. G.; MENEZES, P. T. C.; LUCHINI, L. C.; MOURA, M. A.; DUKE, S. O.. |
| A better method for determination of shikimate in plant tissues is needed to monitor exposure of plants to the herbicide glyphosate [N-(phosphonomethyl)glycine] and to screen the plant kingdom for high levels of this valuable phytochemical precursor to the pharmaceutical oseltamivir. A simple, rapid, and efficient method using microwave-assisted extraction (MWAE) with water as the extraction solvent was developed for the determination of shikimic acid in plant tissues. High performance liquid chromatography was used for the separation of shikimic acid, and chromatographic data were acquired using photodiode array detection. This MWAE technique was successful in recovering shikimic acid from a series of fortified plant tissues at more than 90% efficiency... |
| Tipo: Separatas |
Palavras-chave: Glifosato. |
| Ano: 2009 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/697142 |
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| MATALLO, M. B.; ALMEIDA, S. D. B.; CERDEIRA, A. L.; FRANCO, D. A. S.; LUCHINI, L. C.; MOURA, M. A. M.; DUKE, S. O.. |
| Com o objetivo de verificar o acúmulo de ácido chiquímico em plantas de laranja pêra (Citrus sinensis) num pomar comercial manejado com glifosato, um herbicida sistêmico de amplo espectro, foram coletadas amostras na Fazenda Jequitibá, tradicional no cultivo de citros, situada no Município de Santo Antônio de Posse, SP. O produtor aplicou de forma convencional Roundup® Original a 1.440 g.ha-1 de equivalente ácido (e.a.) do sal de isopropilamino de glifosato em 19/12/2006 na entrelinha de 15 plantas, deixando outras cinco como testemunha. A reaplicação de glifosato a 1.260 g.ha-1 de e.a. foi realizada em 2/4/2007. Em ambos os casos, imediatamente antes da aplicação e aos 3, 7, 10, 15, 20 e 35 dias após, foram coletadas 20 folhas de cada planta tanto da área... |
| Tipo: Artigo de periódico |
Palavras-chave: Herbicidas; Chiquimato; CLAE; Herbicida; Laranja pera; Cromatografia; Herbicides; Oranges; High performance liquid chromatography. |
| Ano: 2011 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/901527 |
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| DUKE, S. O.; CERDEIRA, A. L.; CANTRELL, C. L.; SILVA, F. M.; CORNIANI, N.; VELINI, E. D.; DONEGA, M. A.. |
| The thistles Carduus nutants L. and C. acanthoides L. have both been implicated as allelopathic species. These Eurasian native plants are invasive in the U.S. and other parts of the world, competing well with many native species. Bioassay-guided isolation of phytotoxins from shoots and roots of this plant revealed that a chemical found in the roots, aplotaxene (heptadeca-1,8,11,14-tetrane), to be the most likely candidate as an allelochemical. Contrary to the published work of others, we found that this compound to be moderately phytotoxic. It was also found in relatively large amounts in the roots of both Carduus species, and we found the compound to be exuded by the roots into the soil. |
| Tipo: Separatas |
Palavras-chave: Fitotoxidade.; Alelopatia; Erva daninha.; Carduus nutans; Carduus acanthoides; Allelochemicals. |
| Ano: 2013 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/981690 |
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| DUKE, S. O.; CERDEIRA, A. L.. |
| Transgenic bromoxynil-, glufosinate-, and glyphosate-resistant crops have been commercialized and grown extensively in the Western Hemisphere and, to a lesser extent, elsewhere. Bromoxynil-resistant crops have been removed from the market. Few new herbicide-resistant crops (HRCs) are likely to be introduced in the near future. Glyphosate-resistant cotton and soybean have become dominant in those countries where they can be grown. Previous and potential effects of glufosinate and glyphosate on contamination of soil, water, and air are minimal, compared to that caused by the herbicides that they replace when HRCs are adopted. No risks have been found with food or feed safety or nutritional value in products from currently available HRCs. Both glufosinate-... |
| Tipo: Parte de livro |
Palavras-chave: Herbicida; Impacto Ambiental.. |
| Ano: 2005 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1024725 |
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| Registros recuperados: 19 | |
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