Data/hora: 03/06/2024 04:52:30

Provedor de dados: | 74
País: | Brazil
Título: | Multiple introductions and gene flow in subtropical South American populations of the fireweed, Senecio madagascariensis(Asteraceae)
Autores: | Mäder,Geraldo; Castro,Luana; Bonatto,Sandro Luis; Freitas,Loreta Brandão de.
Data: | 2016-03-01
Ano: | 2016
Palavras-chave: | Microsatellites; ITS; Pampas; Weed; Spread.
Resumo: | Abstract Non-indigenous plants exhibit different attributes that make them aggressive competitors with indigenous plants and serious threats to biodiversity.Senecio madagascariensis (fireweed, Asteraceae), a native from southern Africa, is a strong competitor in agricultural activities and has toxic alkaloids that may result in high cattle mortality. In Brazil, this weed was collected for the first time in 1995 and has since spread quickly throughout the Pampas region. To better understand the invasion of the fireweed in South America, we used a genetic characterization with internal transcribed spacer (ITS) and microsatellite markers. Based on the ITS data, the southern Brazil populations of S. madagascariensis shared genetic homology with samples taken from the Hawaiian Islands and South Africa. Microsatellite analysis showed the genetic diversity split in two clusters, perhaps intimating the independent introduction of each species into South America. Although fireweed was introduced recently in southern Brazil, the considerable levels of genetic diversity, gene flow, and inbreeding may indicate success in the species establishment in this environment.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572016000100135
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/1678-4685-GMB-2015-0167
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.39 n.1 2016
Fonte: | info:eu-repo/semantics/openAccess