Chromosome studies in Orchidaceae: karyotype divergence in Neotropical genera in subtribe Maxillariinae

dc.creatorMoraes, AP
dc.creatorLeitch, IJ
dc.creatorLeitch, AR
dc.date2012
dc.dateSEP
dc.date2014-07-30T13:59:30Z
dc.date2015-11-26T16:34:22Z
dc.date2014-07-30T13:59:30Z
dc.date2015-11-26T16:34:22Z
dc.date.accessioned2018-03-28T23:16:34Z
dc.date.available2018-03-28T23:16:34Z
dc.identifierBotanical Journal Of The Linnean Society. Wiley-blackwell, v. 170, n. 1, n. 29, n. 39, 2012.
dc.identifier0024-4074
dc.identifierWOS:000307386500003
dc.identifier10.1111/j.1095-8339.2012.01266.x
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/55881
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/55881
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1271172
dc.descriptionHere, we study karyotype divergence in the closely related genera Brasiliorchis, Christensonella and Trigonidium belonging to subtribe Maxillariinae of subfamily Epidendroideae (Orchidaceae). We compare karyotypes in 15 species by (1) measuring 1C genome sizes, (2) mapping the distribution of 4',6-diamidino-2-phenylindole and chromomycin A3 chromosome bands and (3) localizing 5S and 45S nuclear ribosomal DNA (rDNA) sequences using fluorescent in situ hybridization. Recently, phylogenetic studies have been conducted to resolve species and genera relationships in subtribe Maxillariinae. We used these phylogenetic trees to map the cytogenetic characters in an evolutionary framework. This has enabled a better understanding of the patterns of genomic divergence in the group. Genome sizes range from 1C?=?1.85 to 4.1?pg. The largest, B.?schunkeana, shows evidence of genome upsizing, probably through the acquisition of tandem repeats that now form large 4',6-diamidino-2-phenylindole-positive blocks of heterochromatin. Our cytogenetic data are consistent with a base chromosome number of 2n?=?40, although Christensonella is characterized by a dysploid reduction in chromosome number to 2n?=?36. The number of 5S and 45S rDNA sites is variable between species, consistent with high rates of karyotype divergence. (c) 2012 The Linnean Society of London, Botanical Journal of the Linnean Society, 2012, 170, 29-39.
dc.description170
dc.description1
dc.description29
dc.description39
dc.descriptionKLARF Program, Royal Botanic Garden, Kew
dc.languageen
dc.publisherWiley-blackwell
dc.publisherHoboken
dc.publisherEUA
dc.relationBotanical Journal Of The Linnean Society
dc.relationBot. J. Linnean Soc.
dc.rightsfechado
dc.rightshttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dc.sourceWeb of Science
dc.subjectAtlantic Rainforest
dc.subjectBrasiliorchis
dc.subjectChristensonella
dc.subjectrDNA
dc.subjectgenome size
dc.subjectin situ hybridization
dc.subjectkaryotype evolution
dc.subjectTrigonidium
dc.subjectRibosomal Dna
dc.subjectGenome Size
dc.subjectEvolution
dc.subjectGenus
dc.subjectRetrotransposons
dc.subjectHeterochromatin
dc.subjectBrasiliorchis
dc.subjectActivation
dc.subjectPhylogeny
dc.subjectDiversity
dc.titleChromosome studies in Orchidaceae: karyotype divergence in Neotropical genera in subtribe Maxillariinae
dc.typeArtículos de revistas


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