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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: |
20/09/2012 |
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Data da última atualização: |
20/09/2012 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
QUEIROZ, S. C. do N. de; CANTRELL, C. L.; DUKE, S. O.; WEDGE, D. E.; NANDULA, V. K.; MORAES, R. M.; CERDEIRA, A. L. |
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Afiliação: |
SONIA CLAUDIA DO N DE QUEIROZ, CNPMA; CHARLES L. CANTRELL, USDA-ARS; STEPHEN O. DUKE, USDA-ARS; DAVID E. EDGE, USDA-ARS; VIJAY K. NANDULA, USDA-ARS; RITA MARIA MORAES, UNIVERSITY OF MISSISSIPI; ANTONIO LUIZ CERDEIRA, CNPMA. |
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Título: |
Bioassay-directed isolation and identification of phytotoxic and fungitoxic acetylenes from Conyza canadensis. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Journal of Agricultural and Food Chemistry, Washington, DC, v. 60, n. 23, p. 5893-5898, 2012. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Conyza canadensis (L.) Cronquist syn. (horseweed) is a problematic and invasive weed with reported allelopathic properties. To identify the phytotoxic constituents of the aerial parts, a systematic bioactivity-guided fractionation of the dichloromethane extract was performed. Three active enyne derivatives, (2Z,8Z)-matricaria acid methyl ester, (4Z,8Z)-matricaria lactone, and (4Z)-lachnophyllum lactone, were identified. The lactones inhibited growth of the monocot Agrostis stolonifera (bentgrass) and the dicot Lactuca sativa (lettuce) at 1 mg mL−1, while the (2Z,8Z)-matricaria acid methyl ester was less active. In a dose−response screening of the lactones for growth inhibitory activity against Lemna paucicostata, (4Z)-lachnophyllum lactone was the most active with an IC50 of 104 μM, while the (4Z,8Z)-matricaria lactone was less active (IC50 of 220 μM). In a fungal direct bioautography assay, the two lactones at 10 and 100 μg/spot inhibited growth of the plant pathogenic fungi Colletotrichum acutatum, Colletotrichum fragariae, and Colletotrichum gloeosporioides. In a dose−response screening of the lactones against six different plant pathogenic fungi, (4Z,8Z)-matricaria lactone was more active than the commercial fungicide azoxystrobin on Col. acutatum, Col. fragariae, and Col. gloeosporioides at 30 μM and about as active as the commercial fungicide captan against Col. gloeosporioides, while (4Z)-lachnophyllum lactone was less active. MenosAbstract: Conyza canadensis (L.) Cronquist syn. (horseweed) is a problematic and invasive weed with reported allelopathic properties. To identify the phytotoxic constituents of the aerial parts, a systematic bioactivity-guided fractionation of the dichloromethane extract was performed. Three active enyne derivatives, (2Z,8Z)-matricaria acid methyl ester, (4Z,8Z)-matricaria lactone, and (4Z)-lachnophyllum lactone, were identified. The lactones inhibited growth of the monocot Agrostis stolonifera (bentgrass) and the dicot Lactuca sativa (lettuce) at 1 mg mL−1, while the (2Z,8Z)-matricaria acid methyl ester was less active. In a dose−response screening of the lactones for growth inhibitory activity against Lemna paucicostata, (4Z)-lachnophyllum lactone was the most active with an IC50 of 104 μM, while the (4Z,8Z)-matricaria lactone was less active (IC50 of 220 μM). In a fungal direct bioautography assay, the two lactones at 10 and 100 μg/spot inhibited growth of the plant pathogenic fungi Colletotrichum acutatum, Colletotrichum fragariae, and Colletotrichum gloeosporioides. In a dose−response screening of the lactones against six different plant pathogenic fungi, (4Z,8Z)-matricaria lactone was more active than the commercial fungicide azoxystrobin on Col. acutatum, Col. fragariae, and Col. gloeosporioides at 30 μM and about as active as the commercial fungicide captan against Col. gloeosporioides, while (4Z)-lachnophyllum lactone was less a... Mostrar Tudo |
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Palavras-Chave: |
Acetylenes; Horseweed. |
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Thesagro: |
Alelopatia; Erva daninha; Fungicida; Herbicida; Toxidez. |
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Thesaurus NAL: |
Alkynes; Allelopathy; Antifungal properties; Conyza canadensis; Fungicides; Herbicides; Phytotoxicity. |
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Categoria do assunto: |
H Saúde e Patologia |
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Marc: |
LEADER 02540naa a2200361 a 4500
001 1934251
005 2012-09-20
008 2012 bl uuuu u00u1 u #d
100 1 $aQUEIROZ, S. C. do N. de
245 $aBioassay-directed isolation and identification of phytotoxic and fungitoxic acetylenes from Conyza canadensis.$h[electronic resource]
260 $c2012
520 $aAbstract: Conyza canadensis (L.) Cronquist syn. (horseweed) is a problematic and invasive weed with reported allelopathic properties. To identify the phytotoxic constituents of the aerial parts, a systematic bioactivity-guided fractionation of the dichloromethane extract was performed. Three active enyne derivatives, (2Z,8Z)-matricaria acid methyl ester, (4Z,8Z)-matricaria lactone, and (4Z)-lachnophyllum lactone, were identified. The lactones inhibited growth of the monocot Agrostis stolonifera (bentgrass) and the dicot Lactuca sativa (lettuce) at 1 mg mL−1, while the (2Z,8Z)-matricaria acid methyl ester was less active. In a dose−response screening of the lactones for growth inhibitory activity against Lemna paucicostata, (4Z)-lachnophyllum lactone was the most active with an IC50 of 104 μM, while the (4Z,8Z)-matricaria lactone was less active (IC50 of 220 μM). In a fungal direct bioautography assay, the two lactones at 10 and 100 μg/spot inhibited growth of the plant pathogenic fungi Colletotrichum acutatum, Colletotrichum fragariae, and Colletotrichum gloeosporioides. In a dose−response screening of the lactones against six different plant pathogenic fungi, (4Z,8Z)-matricaria lactone was more active than the commercial fungicide azoxystrobin on Col. acutatum, Col. fragariae, and Col. gloeosporioides at 30 μM and about as active as the commercial fungicide captan against Col. gloeosporioides, while (4Z)-lachnophyllum lactone was less active.
650 $aAlkynes
650 $aAllelopathy
650 $aAntifungal properties
650 $aConyza canadensis
650 $aFungicides
650 $aHerbicides
650 $aPhytotoxicity
650 $aAlelopatia
650 $aErva daninha
650 $aFungicida
650 $aHerbicida
650 $aToxidez
653 $aAcetylenes
653 $aHorseweed
700 1 $aCANTRELL, C. L.
700 1 $aDUKE, S. O.
700 1 $aWEDGE, D. E.
700 1 $aNANDULA, V. K.
700 1 $aMORAES, R. M.
700 1 $aCERDEIRA, A. L.
773 $tJournal of Agricultural and Food Chemistry, Washington, DC$gv. 60, n. 23, p. 5893-5898, 2012.
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