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

Author(s)

Moraes, Ana P. ^{[1, 2]} ; Chinaglia, Mariana ^[1] ; Palma-Silva, Clarisse ^[3] ; Pinheiro, Fabio ^[4]

Affiliation

^[1] Univ Estadual Campinas UNICAMP, Inst Biol, Dept Biol Vegetal, Lab Biossistemat & Evolucao Plantas, Sao Paulo - Brazil

^[2] Univ Fed ABC UFABC, Programa Posgrad Evolucao & Diversidade, BR-09210580 Sao Paulo - Brazil

^[3] Univ Estadual Paulista UNESP, Inst Biol, Dept Ecol, Sao Paulo - Brazil

^[4] Nucleo Pesquisas Orquidario Estado, Inst Bot, Sao Paulo - Brazil

• Document type: Journal article
• Source: ECOLOGY AND EVOLUTION; v. 3, n. 11, p. 3824-3837, OCT 2013.
• Web of Science Citations: 18

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. (AU)

• FAPESP's process: 09/15052-0 - Phylogeography of the species of Epidendrum (Orchidaceae) belonging to the Atlantic clade (subgenus Amphiglottium)
• Grantee: Fábio Pinheiro
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 11/00608-3 - Speciation process in Epidendrum: cytogenetics approaches on the avaliation of a new hybrid species(E. fulgens × E. puniceoluteum)
• Grantee: Mariana Chinaglia
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 12/22077-2 - Plant genome feedback to the environmental variations: what Orchidaceae have to tell?
• Grantee: Ana Paula de Moraes
• Support Opportunities: Scholarships in Brazil - Young Researchers
• FAPESP's process: 09/52725-3 - Speciation, reproductive isolation, and population genetics in species of Bromeliaceae family: implications for taxonomy, evolution and conservation
• Grantee: Clarisse Palma da Silva
• Support Opportunities: BIOTA-FAPESP Program - Young Investigators Grants
• FAPESP's process: 09/17411-8 - Speciation, reproductive isolation, and population genetics in species of Bromeliaceae family: implications for taxonomy, evolution and conservation
• Grantee: Clarisse Palma da Silva
• Support Opportunities: Scholarships in Brazil - BIOTA - Young Researchers
• FAPESP's process: 11/22215-3 - Plant genome responses to environmental variation: what Orchidaceae have to tell?
• Grantee: Ana Paula de Moraes
• Support Opportunities: Research Grants - Young Investigators Grants