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| Registros recuperados : 47 | |
| Registros recuperados : 47 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Meio Ambiente. Para informações adicionais entre em contato com cnpma.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
12/11/2012 |
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Data da última atualização: |
12/11/2012 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
CERDEIRA, A. L.; CANTRELL, C. L.; DAYAN, F. E.; BYRD, J. D.; DUKE, S. O. |
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Afiliação: |
ANTONIO LUIZ CERDEIRA, CNPMA; CHARLES L. CANTRELL, CHARLES L. CANTRELL, USDA-ARS; FRANCK E. DAYAN, USDA-ARS; JOHN D. BYRD, Mississipi State UNiversity; STEPHEN O. DUKE, USDA-ARS. |
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Título: |
Tabanone, a new phytotoxic constituent of cogongrass (Imperata cylindrica). |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Weed Science, Champaign, v. 60, n. 2, p. 212-218, 2012. |
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Idioma: |
Inglês |
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Conteúdo: |
Cogongrass is a troublesome, invasive weedy species with reported allelopathic properties. The phytotoxicity of different constituents isolated from roots and aerial parts of this species was evaluated on garden lettuce and creeping bentgrass. No significant phytotoxic activity was detected in the methylene chloride, methanol, or water extracts when tested at 1.0 mg ml21. However, the total essential oil extract of cogongrass aerial parts was active. Bioactivity-guided fractionation of this extract using silica gel column chromatography led to the identification of megastigmatrienone, 4-(2-butenylidene)- 3,5,5- trimethyl-2-cyclohexen-1-one (also called tabanone), as a mixture of four stereoisomers responsible for most of the activity. Tabanone inhibited growth of frond area of lesser duckweed, root growth of garden onion, and fresh weight gain of garden lettuce with 50% inhibition values of 0.094, 3.6, and 6.5 mM, respectively. The target site of tabanone is not known, but its mode of action results in rapid loss of membrane integrity and subsequent reduction in the rate of photosynthetic electron flow. |
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Thesagro: |
Erva daninha; Óleo essencial; Toxidez. |
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Thesaurus NAL: |
Allelochemicals; Allelopathy; Essential oils; Imperata cylindrica; Phytotoxins. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 01856naa a2200265 a 4500
001 1939434
005 2012-11-12
008 2012 bl uuuu u00u1 u #d
100 1 $aCERDEIRA, A. L.
245 $aTabanone, a new phytotoxic constituent of cogongrass (Imperata cylindrica).$h[electronic resource]
260 $c2012
520 $aCogongrass is a troublesome, invasive weedy species with reported allelopathic properties. The phytotoxicity of different constituents isolated from roots and aerial parts of this species was evaluated on garden lettuce and creeping bentgrass. No significant phytotoxic activity was detected in the methylene chloride, methanol, or water extracts when tested at 1.0 mg ml21. However, the total essential oil extract of cogongrass aerial parts was active. Bioactivity-guided fractionation of this extract using silica gel column chromatography led to the identification of megastigmatrienone, 4-(2-butenylidene)- 3,5,5- trimethyl-2-cyclohexen-1-one (also called tabanone), as a mixture of four stereoisomers responsible for most of the activity. Tabanone inhibited growth of frond area of lesser duckweed, root growth of garden onion, and fresh weight gain of garden lettuce with 50% inhibition values of 0.094, 3.6, and 6.5 mM, respectively. The target site of tabanone is not known, but its mode of action results in rapid loss of membrane integrity and subsequent reduction in the rate of photosynthetic electron flow.
650 $aAllelochemicals
650 $aAllelopathy
650 $aEssential oils
650 $aImperata cylindrica
650 $aPhytotoxins
650 $aErva daninha
650 $aÓleo essencial
650 $aToxidez
700 1 $aCANTRELL, C. L.
700 1 $aDAYAN, F. E.
700 1 $aBYRD, J. D.
700 1 $aDUKE, S. O.
773 $tWeed Science, Champaign$gv. 60, n. 2, p. 212-218, 2012.
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