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Evolutionary trends in Iridaceae: new cytogenetic findings from the New World

dc.contributor.authorMoraes, Ana Paula
dc.contributor.authorSouza-Chies, Tatiana Teixeira de [UNESP]
dc.contributor.authorStiehl-Alves, Eudes Maria
dc.contributor.authorBurchardt, Paula
dc.contributor.authorEggers, Lilian [UNESP]
dc.contributor.authorSiljak-Yakovlev, Sonja
dc.contributor.authorBrown, Spencer C.
dc.contributor.authorChauveau, Olivier [UNESP]
dc.contributor.authorNadot, Sophie
dc.contributor.authorBourge, Mickael
dc.contributor.authorViccini, Lyderson Facio
dc.contributor.authorKaltchuk-Santos, Eliane [UNESP]
dc.contributor.institutionUniversidade Federal do Rio Grande do Sul (UFRGS)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversité Paris-Sud
dc.contributor.institutionUniversidade Federal de Juiz de Fora (UFJF)
dc.date.accessioned2015-10-21T13:11:18Z
dc.date.available2015-10-21T13:11:18Z
dc.date.issued2015-01-01
dc.description.abstractWith the present work, we aim to provide a better understanding of chromosome evolutionary trends among southern Brazilian species of Iridoideae. Chromosome numbers and genome sizes were determined for 21 and 22 species belonging to eight genera of Tigridieae and two genera of Trimezieae, respectively. The chromosome numbers of nine species belonging to five genera are reported here for the first time. Analyses of meiotic behaviour, tetrad normality and pollen viability in 14 species revealed regular meiosis and high meiotic indexes and pollen viability (>90%). The chromosome data obtained here and compiled from the literature were plotted onto a phylogenetic framework to identify major events of chromosome rearrangements across the phylogenetic tree of Iridoideae. Following this approach, we propose that the ancestral base chromosome number for Iridoideae is x=8 and that polyploidy and dysploidy events have occurred throughout evolution. Despite the variation in chromosome numbers observed in Tigridieae and Trimezieae, for these two tribes our data provide support for an ancestral base number of x=7, largely conserved in Tigridieae, but a polyploidy event may have occurred prior to the diversification of Trimezieae, giving rise to a base number of x(2)=14 (detected by maximum-parsimony using haploid number and maximum likelihood). In Tigridieae, polyploid cytotypes were commonly observed (2x, 4x, 6x and 8x), whereas in Trimezieae, dysploidy seems to have been the most important event. This feature is reflected in the genome size, which varied greatly among species of Iridoideae, 4.2-fold in Tigridieae and 1.5-fold in Trimezieae. Although no clear difference was observed among the genome sizes of Tigridieae and Trimezieae, an important distinction was observed between these two tribes and Sisyrinchieae, with the latter possessing the smallest genome sizes in Iridoideae.en
dc.description.affiliationUniversidade Federal do Rio Grande do Sul, Departamento de Botânica, Instituto de Biociências
dc.description.affiliationUniversidade Federal do Rio Grande do Sul, Departamento de Genética, Instituto de Biociências
dc.description.affiliationUniversidade Federal de Juiz de Fora, Departamento de Biologia, Instituto de Ciências Biológicas
dc.description.affiliationUnespUniversidade Estadual Paulista, Departamento de Genética, Instituto de Biociências de Botucatu
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdCNPq: 150307/2008-3
dc.description.sponsorshipIdCNPq: 304197/2012-2
dc.description.sponsorshipIdFAPESP: 2011/22215-3
dc.format.extent27-49
dc.identifierhttp://onlinelibrary.wiley.com/doi/10.1111/boj.12232/abstract
dc.identifier.citationBotanical Journal Of The Linnean Society. Hoboken: Wiley-blackwell, v. 177, n. 1, p. 27-49, 2015.
dc.identifier.doi10.1111/boj.12232
dc.identifier.issn0024-4074
dc.identifier.urihttp://hdl.handle.net/11449/128591
dc.identifier.wosWOS:000347461400003
dc.language.isoeng
dc.publisherWiley-Blackwell
dc.relation.ispartofBotanical Journal Of The Linnean Society
dc.relation.ispartofjcr3.124
dc.relation.ispartofsjr1,352
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectChromosome evolutionen
dc.subjectChromosome numberen
dc.subjectDNA contenten
dc.subjectDysploidyen
dc.subjectPolyploidyen
dc.titleEvolutionary trends in Iridaceae: new cytogenetic findings from the New Worlden
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dcterms.rightsHolderWiley-Blackwell
dspace.entity.typePublication
unesp.author.orcid0000-0002-7575-8241[11]
unesp.author.orcid0000-0002-3357-6271[8]
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Biociências, Botucatupt
unesp.departmentGenética - IBBpt

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