Strong postzygotic isolation prevents introgression between two hybridizing Neotropical orchids, Epidendrum denticulatum and E-fulgens

Autor(es)

Pinheiro, Fabio ^[1] ; Cardoso-Gustavson, Poliana ^[2] ; Suzuki, Rogerio Mamoru ^[2] ; Abrao, Monique Cristine R. ^[2] ; Guimaraes, Leonardo R. S. ^[2] ; Draper, David ^[3] ; Moraes, Ana Paula ^[4]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista UNESP, Inst Biociencias, Dept Bot, BR-13506900 Rio Claro, SP - Brazil

^[2] Nucleo Pesquisa Orquidario Estado, Inst Bot, BR-04301902 Sao Paulo, SP - Brazil

^[3] Univ Tecn Particular Loja, Dept Ciencias Nat, Loja 1101608 - Ecuador

^[4] Univ Estadual Paulista UNESP, Inst Biociencias, Dept Genet, BR-18618970 Botucatu, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: EVOLUTIONARY ECOLOGY; v. 29, n. 2, p. 229-248, MAR 2015.
• Citações Web of Science: 7

Resumo

Studies on hybrid zones are essential to understand the origin and evolution of reproductive barriers in plants. To achieve this goal, multidisciplinary approaches are often required to investigate the role of multiple reproductive isolation (RI) mechanisms. For Epidendrum denticulatum and E. fulgens, two Neotropical food-deceptive orchid species, we used molecular, cytogenetic and morphological analyses, experimental crosses and environmental envelope models to assess the strength of the RI and the mechanisms that prevent species collapse when hybridization occurs. Based on genetic assignment tests, hybrids between E. denticulatum and E. fulgens were detected. However, the low frequency of hybrid specimens found, coupled with the high morphological differentiation between parental species, suggested that strong barriers exist to interspecific gene exchange. Indeed, hybrid plants were largely sterile, as determined by meiotic data and crossing experiments. In the hybrid zone studied here, strong postzygotic barriers maintain species integrity, and these RI mechanisms may be also important during early stages of speciation. (AU)

• Processo FAPESP: 09/15052-0 - Filogeografia das espécies de Epidendrum (Orchidaceae) integrantes do clado Atlântico (subgênero Amphiglottium)
• Beneficiário: Fábio Pinheiro
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/22077-2 - Respostas do genoma vegetal às variações ambientais: o que as Orchidaceae têm a contar?
• Beneficiário: Ana Paula de Moraes
• Modalidade de apoio: Bolsas no Brasil - Jovens Pesquisadores
• Processo FAPESP: 11/22215-3 - Respostas do genoma vegetal às variações ambientais: o que as Orchidaceae têm a contar?
• Beneficiário: Ana Paula de Moraes
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 10/16353-1 - Filogenia e citotaxonomia do "clado Stenorrhynchos" (Spiranthinae, Cranichideae, Orchidoideae, Orchidaceae)
• Beneficiário: Leonardo Ramos Seixas Guimarães
• Modalidade de apoio: Bolsas no Brasil - Doutorado