Data/hora: 01/06/2024 00:49:45

Provedor de dados: 	124	
País: 	Brazil	
Título: 	Chemical characterisation and allelopathic potential of essential oils from leaves and rhizomes of white ginger	
Autores: 	Miranda,Cíntia Alvarenga Santos Fraga; Cardoso,Maria das Graças; Carvalho,Maria Laene Moreira; Figueiredo,Ana Cristina Silva; Andrade,Juliana de.	
Data: 	2015-09-01	
Ano: 	2015	
Palavras-chave: 	Volatile oils; Hedychium coronarium; Allelopathy.	
Resumo: 	ABSTRACTEssential oils have the potential to be used as bioherbicides, and possess the advantage of their biodegradability, high structural diversity and reduced natural resistance to weeds. The essential oils of the leaves and rhizomes of Hedychium coronarium, an exotic invasive plant adapted to different regions of Brazil, were extracted by hydrodistillation and characterised chemically by Gas-Liquid Chromatography and Gas-Liquid Chromatography/Mass Spectrometry. Allelopathic activity was determined using methodologies that evaluate the effects of volatility and direct contact on seed germination and seedling vigour in the lettuce. The major constituents of the essential oil from the leaves were β-pinene (46.9%), α-pinene (19.2%) and β-caryophyllene (13.2%) and from the rhizomes, β-pinene (41.5%), 1.8-cineole (23.6%) and α-pinene (13.1%). When analysing the volatile effects of the essential oils, it was seen that their concentration did not affect seedling first germination count or total germination. The essential oil from the rhizomes was more effective than the essential oil from the leaves in reducing seedling response for SGI, dry weight, and length of the roots and shoots. When evaluating the effect of direct contact with the essential oils, it was seen that both oils reduced the response of all the variables under evaluation, and that in addition, the oil from the rhizomes caused greater reductions than that from the leaves, again for all variables. These results can be attributed to the higher levels of monoterpenes present in the essential oil from the rhizomes, mainly the presence of 1.8-cineole.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000300555	
Editor: 	Universidade Federal do Ceará	
Relação: 	10.5935/1806-6690.20150038	
Formato: 	text/html	
Fonte: 	Revista Ciência Agronômica  v.46 n.3 2015	
Fonte: 	info:eu-repo/semantics/openAccess