Data/hora: 20/05/2024 04:57:47

Provedor de dados: 	190	
País: 	Brazil	
Título: 	Allelopathy of aqueous leaf extracts from the invasive alien tree Pittosporum undulatum on germination and growth of barnyard grass

Alelopatia de extratos aquosos foliares da exótica invasora Pittosporum undulatum na germinação e crescimento do capim-arroz	
Autores: 	Carpanezzi, Fernando Bertol; Gualtieri, Sonia Cristina Juliano.	
Data: 	2014-09-15	
Ano: 	2014	
Palavras-chave: 	Ecology; Plant Ecophysiology Cheesewood tree; Echinochloa crusgalli; Agroecosystems; Floodplains Ecologia; Ecofisiologia Vegetal Pau-incenso; Echinochloa crusgalli; Agroecossistemas; Áreas alagáveis.	
Resumo: 	Barnyard grass (Echinochloa crusgalli (L.) P. Beauv.) is a herbicide-resistant weed that brings negative impacts to rice crops and threatens floodplains biodiversity worldwide. This study aimed to investigate allelopathic influences of extracts from Pittosporum undulatum Vent. (cheesewood) leaves on barnyard grass. Leachates in concentrations of 20%, 15%, 10%, 5% and 2.5% (w/v), aqueous extracts from powdered leached and non-leached leaves (10%, 7,5%, 5%, 2.5% and 1.25% for both), coumarin solution at 0.6 mM and original Roundup ® in concentration according to the label information were prepared. Petri-dishes germination bioassays, with counting at each 12 hours, allowed to determinate both germinability and germination rate; polyethylene glycol (PEG 6000) solutions were prepared to evaluate osmotic effects. In growth tests, seedlings were exposed for seven days, when root and shoot lengths were measured. Germination was sensitive to extracts from powdered leaves. In regard to growth, roots showed dose-dependent length reduction and necrosis. Inhibitory effects from different aqueous extracts suggest action of both internal and external leaf allelochemicals, raising the possibility of Pittosporum undulatum use for barnyard grass control.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Português	
Identificador: 	http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/599

10.4336/2014.pfb.34.79.599	
Editor: 	Embrapa Florestas	
Relação: 	http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/599/368

http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/downloadSuppFile/599/445	
Formato: 	application/pdf	
Fonte: 	Brazilian Journal of Forestry Research; v. 34, n. 79 (2014): jul./set.; 173-179

Pesquisa Florestal Brasileira; v. 34, n. 79 (2014): jul./set.; 173-179

1983-2605

1809-3647	
Fonte: 	Direitos autorais 2015 Pesquisa Florestal Brasileira

http://creativecommons.org/licenses/by-nc-nd/4.0