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Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/75810
Título: 
Phylogeographic Structure And Outbreeding Depression Reveal Early Stages Of Reproductive Isolation In The Neotropical Orchid Epidendrum Denticulatum
Autor(es): 
Instituição: 
  • Instituto de Botânica
  • Università degli Studi di Napoli Federico II
  • Royal Botanic Gardens Kew
  • Universidade Estadual Paulista (UNESP)
ISSN: 
  • 0014-3820
  • 1558-5646
Resumo: 
Phylogeographic studies provide an important framework for investigating the mechanisms operating during the earliest stages of speciation, as reproductive barriers can be examined among divergent lineages in a geographic context. We investigated the evolution of early stages of intrinsic postmating isolation among different populations and lineages of Epidendrum denticulatum, a Neotropical orchid distributed across different biomes in South America. We estimated genetic diversity and structure for both nuclear and plastid markers, using a haplotype network, differentiation tests, Bayesian assignment analysis, and divergence time estimates of the main lineages. Reproductive barriers among divergent lineages were examined by analyzing seed viability following reciprocal crossing experiments. Strong plastid phylogeographic structure was found, indicating that E. denticulatum was restricted to multiple refuges during South American forest expansion events. In contrast, significant phylogeographic structure was not found for nuclear markers, suggesting higher gene flow by pollen than by seeds. Large asymmetries in seed set were observed among different plastid genetic groups, suggesting the presence of polymorphic genic incompatibilities associated with cytonuclear interactions. Our results confirm the importance of phylogeographic studies associated with reproductive isolation experiments and suggest an important role for outbreeding depression during the early stages of lineage diversification. © 2013 The Society for the Study of Evolution.
Data de publicação: 
1-Jul-2013
Citação: 
Evolution, v. 67, n. 7, p. 2024-2039, 2013.
Duração: 
2024-2039
Palavras-chaves: 
  • Genetic structure
  • microsatellites
  • multiple refuges
  • Orchidaceae
  • phylogeography
  • reproductive barriers
  • South America
  • biome
  • divergence
  • genetic differentiation
  • genetic marker
  • herb
  • Neotropical Region
  • polymorphism
  • population distribution
  • population structure
  • reproductive isolation
  • Epidendrum
Fonte: 
http://dx.doi.org/10.1111/evo.12085
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/75810
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