|
|
|
|
|
| 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 |
| |
|
| |
|
|
| 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 |
| |
|
| |
|
|
| 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 |
| |
|
|
|
