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Title: Complex cytogeographical patterns reveal a dynamic tetraploid-octoploid contact zone
Authors: Castro, Mariana
Castro, Sílvia 
Rodrigues, Albano 
Husband, Brian
Loureiro, João 
Keywords: Contact zone; Gladiolus communis; distribution patterns; hexaploid; ybridization; niche modelling; niche overlapping; octoploid; tetraploid
Issue Date: 14-Feb-2018
Publisher: Oxford University Press
Project: info:eu-repo/grantAgreement/FCT/SFRH/SFRH/BD/89910/2012/PT 
Projeto exploratório IF/01267/2013 
Serial title, monograph or event: AoB PLANTS
Volume: 10
Issue: 2
Abstract: The distribution of cytotypes in mixed-ploidy species is crucial for evaluating ecological processes involved in the establishment and evolution of polyploid taxa. Here, we use flow cytometry and chromosome counts to explore cytotype diversity and distributions within a tetraploid-octoploid contact zone. We then use niche modelling and ploidy seed screening to assess the roles of niche differentiation among cytotypes and reproductive interactions, respectively, in promoting cytotype coexistence. Two cytotypes, tetraploids and octoploids, were dominant within the contact zone. They were most often distributed parapatrically or allopatrically, resulting in high geographic isolation. Still, 16.7 % of localities comprised two or more cytotypes, including the intermediate hexaploid cytotype. Tetraploids and octoploids had high environmental niche overlap and associated with similar climatic environments, suggesting they have similar ecological requirements. Given the geographical separation and habitat similarity among cytotypes, mixed-ploidy populations may be transitional and subject to the forces of minority cytotype exclusion which lead to pure-ploidy populations. However, seed ploidy analysis suggests that strong reproductive barriers may enforce assortative mating which favours stable cytotype coexistence. High cytogenetic diversity detected in the field suggests that unreduced gamete formation and hybridization events seem frequent in the studied polyploid complex and might be involved with the recurrent polyploid formation, governing, as well, the gene flow between cytogenetic entities.
ISSN: 2041-2851
DOI: 10.1093/aobpla/ply012
Rights: openAccess
Appears in Collections:I&D CEGOT - Artigos em Revistas Internacionais

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