Interploidy hybridization in sympatric zones: the formation of Epidendrum fulgens x E. puniceoluteum hybrids (Epidendroideae, Orchidaceae)


Autoria(s): Moraes, Ana P.; Chinaglia, Mariana; Palma-Silva, Clarisse; Pinheiro, Fabio
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

03/12/2014

03/12/2014

01/10/2013

Resumo

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Processo FAPESP: 11/22215-3

Processo FAPESP: 12/22077-2

Processo FAPESP: 11/00608-3

Processo FAPESP: 09/52725-3

Processo FAPESP: 09/17411-8

Processo FAPESP: 09/15052-0

Interspecific hybridization is a primary cause of extensive morphological and chromosomal variation and plays an important role in plant species diversification. However, the role of interploidal hybridization in the formation of hybrid swarms is less clear. Epidendrum encompasses wide variation in chromosome number and lacks strong premating barriers, making the genus a good model for clarifying the role of chromosomes in postzygotic barriers in interploidal hybrids. In this sense, hybrids from the interploidal sympatric zone between E. fulgens (2n=2x=24) and E. puniceoluteum (2n=4x=56) were analyzed using cytogenetic techniques to elucidate the formation and establishment of interploidal hybrids. Hybrids were not a uniform group: two chromosome numbers were observed, with the variation being a consequence of severe hybrid meiotic abnormalities and backcrossing with E. puniceoluteum. The hybrids were triploids (2n=3x=38 and 40) and despite the occurrence of enormous meiotic problems associated with triploidy, the hybrids were able to backcross, producing successful hybrid individuals with broad ecological distributions. In spite of the nonpolyploidization of the hybrid, its formation is a long-term evolutionary process rather than a product of a recent disturbance, and considering other sympatric zones in Epidendrum, these events could be recurrent.

Formato

3824-3837

Identificador

http://dx.doi.org/10.1002/ece3.752

Ecology And Evolution. Hoboken: Wiley-blackwell, v. 3, n. 11, p. 3824-3837, 2013.

2045-7758

http://hdl.handle.net/11449/111520

10.1002/ece3.752

WOS:000325486000014

WOS000325486000014.pdf

Idioma(s)

eng

Publicador

Wiley-Blackwell

Relação

Ecology and Evolution

Direitos

openAccess

Palavras-Chave #Epidendrum #GISH #hybrid zone #interploidy crossing #karyotype #orchids #plant speciation
Tipo

info:eu-repo/semantics/article