Data/hora: 06/06/2024 03:35:14

Biblioteca(s): 	Embrapa Meio Ambiente.	
Data corrente: 	12/11/2012	
Data da última atualização: 	12/11/2012	
Autoria: 	CERDEIRA, A. L.; CANTRELL, C. L.; DAYAN, F. E.; BYRD, J. D.; DUKE, S. O.	
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.	
Título: 	Tabanone, a new phytotoxic constituent of cogongrass (Imperata cylindrica).	
Ano de publicação: 	2012	
Fonte/Imprenta: 	Weed Science, Champaign, v. 60, n. 2, p. 212-218, 2012.	
Idioma: 	Inglês	
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.	
Thesagro: 	Erva daninha; Óleo essencial; Toxidez.	
Thesaurus Nal: 	Allelochemicals; Allelopathy; Essential oils; Imperata cylindrica; Phytotoxins.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
Registro original: 	Embrapa Meio Ambiente (CNPMA)	
Exemplares: 	CNPMA - (11526-1) - UPC - AP - DD -  -  -  - DIS