Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/7831
Título: Filogenia e filogeografia do subgénero Narcissus L.
Autor: Fonseca, João Paulo Dias Correia
Orientador: Costa, José Carlos
Almada, Vitor Manuel Carvalho
Palavras-chave: systematics
biogeography
evolution
hybridization
DNA
Data de Defesa: 2014
Editora: ISA/UL
Citação: Fonseca, João Paulo Dias Correia - Filogenia e filogeografia do subgénero Narcissus L.. Lisboa: ISA, 2014, 232 p.
Resumo: We analyzed the phylogeny and phylogeography of the subgenus Narcissus L. (Amarilidaceae) through molecular genetics. Six chloroplastic fragments were sequenced: trnL-F, matk, two non-overlapping fragments of nadhf, rbcl, and rps16, and two nuclear fragments: partial ribosomal DNA and a Dead/deah box RNA helicase. We studied 121 populations of Narcissus, representing 55 taxa, collected in Portugal, Spain, Morocco and Andorra. The sequences were analyzed using maximum parsimony, maximum likelihood and bayesian inference. The results were compared with previous taxonomical proposals. This analysis indicated that many of the species proposed in the literature are not valid and that the subgenus Narcissus suffered an intense taxonomic inflation as result of the overemphasis of small morphological differences. In other cases, the results validated some taxa as true species. Our data also indicate the hybrid origin of some taxa and, in some cases, permitted the identification of the putative ancestral species. The analysis of chloroplastic DNA sequences through a haplotype network indicated that most of the lineages were differentiated in Southern Iberia and thereafter migrated north or east. We also analyzed the floral morphology of the sections Juncifolii and Jonquillae, and discussed the identification problems
Descrição: Doutoramento em Biologia - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/7831
Aparece nas colecções:BISA - Teses de Doutoramento / Doctoral Thesis

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RESUMO E ABSTRACT.pdfResumo/Abstract32,03 kBAdobe PDFVer/Abrir


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