Data/hora: 16/06/2024 10:45:26

Provedor de dados: 	39	
País: 	Brazil	
Título: 	Disturbance as a factor in breaking dormancy and enhancing invasiveness of African grasses in a Neotropical Savanna	
Autores: 	Gorgone-Barbosa,Elizabeth; Pivello,Vânia R.; Baeza,M. Jaime; Fidelis,Alessandra.	
Data: 	2016-03-01	
Ano: 	2016	
Palavras-chave: 	Cerrado; Fire; Germination percentage; Invasive species; Physiological dormancy; Seed dormancy; Temperature fluctuation; Urochloa brizantha; Urochloa decumbens.	
Resumo: 	The Cerrado is threatened by wildfires and invasive species. We aimed to evaluate in laboratory conditions whether temperature fluctuation at the soil surface, resulting from the absence of vegetation due to fire, can affect the germination of Urochloa decumbens and U. brizantha, two invasive African grasses. Seeds of both species were submitted to simulations: 1) temperature during fire at 1cm belowground (F); 2) temperature fluctuation at 1cm belowground without vegetation cover for a month (TF); 3) (F) + (TF); 4) control at 25ºC. After treatments, seeds were put to germinate at 25ºC for 40 days. We had four replicates per treatment and three temporal replicates. We compared germination percentage and the mean germination time among treatments using ANOVA. The treatments TF and F+TF had the highest germination values for both species. The results showed that fire per se could not stimulate seed germination, however, they suggest that a disturbance that produces a pattern of temperature fluctuation is able to break dormancy and enhance seed germination and, consequently, increase the invasiveness of the study species. Vegetation gaps resulting from disturbance may become new sites of invasion. This information is important for making management decisions regarding the control of these species.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100131	
Editor: 	Sociedade Botânica do Brasil	
Relação: 	10.1590/0102-33062015abb0317	
Formato: 	text/html	
Fonte: 	Acta Botanica Brasilica  v.30 n.1 2016	
Fonte: 	info:eu-repo/semantics/openAccess