Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/4045
Título: Evolution of the Fucaceae (Phaeophyceae) inferred from nrDNA-ITS
Autor: Serrão, Ester
Alice, L. A.
Brawley, S. H.
Palavras-chave: Ascophyllum
nrDNA internal transcribed spacers
Data: Abr-1999
Editora: Wiley
Citação: Serrão, E.A.; Alice, L.A.; Brawley, S.H.Evolution of the Fucaceae (Phaeophyceae) inferred from nrDNA-ITS, Journal of Phycology, 35, 2, 382-394, 1999.
Resumo: Sequences of the internal transcribed spacer region (ITS-1, 5.8S, and ITS-2) of nuclear ribosomal DNA were obtained from 16 species representing all six genera of Fucaceae (Ascophyllum, Fucus, Hesperophycus, Pelvetia, Pelvetiopsis, and Xiphophora) plus one outgroup (Hormosira). Parsimony analysis indicated that the family Fucaceae is monophyletic and that the northern hemisphere taxa are highly divergent from the only southern hemisphere genus, Xiphophora. The genus Pelvetia is not monophyletic because the European P. canaliculata is more closely related to Fucus, Hesperophycus, and Pelvetiopsis than to other Pelvetia species. We establish Silvetia, gen. nov. and transfer the 3 Pacific species of Pelvetia to the new genus. Fucus is monophyletic and not ancestral in the Fucaceae. The ITS sequences identified two strongly supported lineages within Fucus, one with F. serratus sister to the clade containing F. gardneri, F. distichus, and F. evanescens and a second including F. vesiculosus, F. spiralis, F. ceranoides, and F. virsoides. The ITS was not useful for resolving relationships within each of these clusters and between populations of F. vesiculosus. Within-individual variation in ITS sequences is high in Fucus, a derived genus, compared to Ascophyllum, a more ancestral genus. Mapping of the two characters that form the basis of Powell’s model for speciation in the Fucaceae showed that 1) number of eggs per oogonium has not followed a gradual reduction and that 2) monoecy/dioecy has changed several times during evolution of this family.
Peer review: yes
URI: http://hdl.handle.net/10400.1/4045
DOI: http://dx.doi.org/ 10.1046/j.1529-8817.1999.3520382.x
ISSN: 0022-3646
Versão do Editor: http://onlinelibrary.wiley.com/doi/10.1046/j.1529-8817.1999.3520382.x/full
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