Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/200879
Type: Artigo de periódico
Title: Interploidy Hybridization In Sympatric Zones: The Formation Of Epidendrum Fulgens × E. Puniceoluteum Hybrids (epidendroideae, Orchidaceae).
Author: Moraes, Ana P
Chinaglia, Mariana
Palma-Silva, Clarisse
Pinheiro, Fábio
Abstract: 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.
Subject: Epidendrum
Gish
Hybrid Zone
Interploidy Crossing
Karyotype
Orchids
Plant Speciation
Rights: aberto
Identifier DOI: 10.1002/ece3.752
Address: http://www.ncbi.nlm.nih.gov/pubmed/24198942
Date Issue: 2013
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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