Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/88927
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 CENTRO-01-0145-FEDER-000007 |
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. | URI: | https://hdl.handle.net/10316/88927 | ISSN: | 2041-2851 | DOI: | 10.1093/aobpla/ply012 | Rights: | openAccess |
Appears in Collections: | I&D CEGOT - Artigos em Revistas Internacionais |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Complex cytogeographical patterns reveal a dynamic tetraploid.pdf | 911.9 kB | Adobe PDF | View/Open |
SCOPUSTM
Citations
17
checked on Aug 5, 2024
WEB OF SCIENCETM
Citations
10
17
checked on Aug 2, 2024
Page view(s)
304
checked on Aug 13, 2024
Download(s)
282
checked on Aug 13, 2024
Google ScholarTM
Check
Altmetric
Altmetric
This item is licensed under a Creative Commons License