Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/328504
Type: Artigo
Title: Karyotype Diversity And Genome Size Variation In Neotropical Maxillariinae Orchids
Author: Moraes
A. P.; Koehler
S.; Cabral
J. S.; Gomes
S. S. L.; Viccini
L. F.; Barros
F.; Felix
L. P.; Guerra
M.; Forni-Martins
E. R.
Abstract: Orchidaceae is a widely distributed plant family with very diverse vegetative and floral morphology, and such variability is also reflected in their karyotypes. However, since only a low proportion of Orchidaceae has been analysed for chromosome data, greater diversity may await to be unveiled. Here we analyse both genome size (GS) and karyotype in two subtribes recently included in the broadened Maxillariinea to detect how much chromosome and GS variation there is in these groups and to evaluate which genome rearrangements are involved in the species evolution. To do so, the GS (14 species), the karyotype - based on chromosome number, heterochromatic banding and 5S and 45S rDNA localisation (18 species) - was characterised and analysed along with published data using phylogenetic approaches. The GS presented a high phylogenetic correlation and it was related to morphological groups in Bifrenaria (larger plants - higher GS). The two largest GS found among genera were caused by different mechanisms: polyploidy in Bifrenaria tyrianthina and accumulation of repetitive DNA in Scuticaria hadwenii. The chromosome number variability was caused mainly through descending dysploidy, and x=20 was estimated as the base chromosome number. Combining GS and karyotype data with molecular phylogeny, our data provide a more complete scenario of the karyotype evolution in Maxillariinae orchids, allowing us to suggest, besides dysploidy, that inversions and transposable elements as two mechanisms involved in the karyotype evolution. Such karyotype modifications could be associated with niche changes that occurred during species evolution.
Subject: Bifrenaria
Chromosome Evolution
Chromosome Inversion
Dysploidy
Lycaste
Rdna
Rudolfiella
Xylobium
Editor: Wiley-Blackwell
Hoboken
Citation: Plant Biology. Wiley-blackwell, v. 19, p. 298 - 308, 2017.
Rights: fechado
Identifier DOI: 10.1111/plb.12527
Address: http://onlinelibrary.wiley.com/doi/10.1111/plb.12527/abstract
Date Issue: 2017
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File SizeFormat 
000394908600023.pdf1.05 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.