Atividade alelopática de substâncias químicas isoladas do Capim-Marandu e suas variações em função do pH
This work aimed to isolate, identify and determine the allelopathic activity of the chemical substances produced by Brachiaria brizantha cv. Marandu and to verify the effects of the pH in the solution on the activity of these compounds. The allelopathic activity was evaluated based on germination bi...
| Autor principal: | SANTOS, Lourivaldo da Silva |
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| Outros Autores: | SANTOS, Josiane Cristina Lucas dos, SOUZA FILHO, Antonio Pedro da Silva, CORRÊA, Marivaldo José Costa, VEIGA, Thiago Andre Moura, FERREIRA, Vivianne Cristinne Marinho Freitas, FERREIRA, Isabel Cristina Serrão, GONÇALVES, Nelson Santos, SILVA, Carlos E. da, GUILHON, Giselle Maria Skelding Pinheiro |
| Grau: | Artigo |
| Idioma: | por |
| Publicado em: |
2013
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.ufpa.br/jspui/handle/2011/3928 |
| Resumo: |
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This work aimed to isolate, identify and determine the allelopathic activity of the chemical substances produced by Brachiaria brizantha cv. Marandu and to verify the effects of the pH in the solution on the activity of these compounds. The allelopathic activity was evaluated based on germination bioassays and radicle and hypocotyl growth using the species 'malícia' (Mimosa pudica) and 'mata-pasto' (Senna obtusifolia) as receptors. The effect of pH was analyzed in a range from 3.0 to 9.0. The pentacyclic triterpenes friedelin and epifriefelinol isolated from the shoots of B. brizantha showed a low inhibitory activity against seed germination and radicle and hypocotyl growth of the two receptor plants evaluated. The pentacyclic triterpenes friedelin and epifrifelinol presented differentiated behaviors in relation to the pH variation in the solution, with stronger inhibition activity against the weed 'mata-pasto'. |