Allelopathic effects of aconitic acid on wild poinsettia (Euphorbia heterophylla) and morningglory (Ipomoea grandifolia)

Allelopathic effects of aconitic acid on wild poinsettia (Euphorbia heterophylla) and morningglory (Ipomoea grandifolia)

Autor Voll, E. Google Scholar
Voll, C. E. Google Scholar
Victoria, R. Google Scholar
Instituição Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Universidade Federal de São Paulo (UNIFESP)
Resumo High infestations of alexandergrass (Brachiaria plantaginea) in experimental area have reduced seedbank of some weed species in soil at a greater degree compared to those obtained with the use of an efficient herbicide. Aconitic acid (AA) has been identified in those plants in high concentration. Thus, two experiments were carried out in the laboratory to determine the effects of pure AA on weed seed germination and on endophytic fungi in wild poinsettia (Euphorbia heterophylla) and morningglory (Ipomoea grandifolia) weed species. Doses of AA (0, 0.5, 1.0, and 2.0 mM) were introduced in agar-water 0.5% medium and weed seeds treated with and without external sterilization by sodium hypochloride. Four replications of fifty seeds of each species by treatment were sown in plastic boxes with cover and maintained in germination chamber for 12 days. Reduction in germination rate, root and stem growth were observed in both species, as well as reduction in root number in morningglory were also observed at 2.0 mM concentration of AA. An increase in number of seeds with presence of endophytic fungi was also observed in both species, independently of seed sterilization, mainly of a green type fungi coloration in wild poinsettia. Aconitic acid presents allelopathic activity and can stimulate endophytic fungi species growth in weed seeds.
Palavra-chave allelopathy
endophytic fungi
Idioma Inglês
Data de publicação 2005-01-01
Publicado em Journal of Environmental Science and Health Part B-pesticides Food Contaminants and Agricultural Wastes. New York: Marcel Dekker Inc, v. 40, n. 1, p. 69-75, 2005.
ISSN 0360-1234 (Sherpa/Romeo, fator de impacto)
Publicador Marcel Dekker Inc
Extensão 69-75
Fonte http://www.tandfonline.com/doi/abs/10.1081/PFC-200034226?journalCode=lesb20
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000226145900010
Endereço permanente http://repositorio.unifesp.br/handle/11600/28099

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