Data/hora: 22/06/2024 14:05:33

Biblioteca(s): | Embrapa Gado de Leite.
Data corrente: | 16/12/2019
Data da última atualização: | 06/02/2024
Autoria: | CHIAVEGATTO, R. B.; CHAVES, A. L. A.; ROCHA, L. C.; BENITES, F. R. G.; PERUZZI, L.; TECHIO, V. H.
Afiliação: | RAQUEL BEZERRA CHIAVEGATTO, UFLA; Ana Luisa Arantes Chaves, UFLA; Laiane Corsini Rocha, UFLA; FLAVIO RODRIGO GANDOLFI BENITES, CNPGL; Lorenzo Peruzzi, Pisa University, Pisa, Italy; Vânia Helena Techio, UFLA.
Título: | Heterochromatin Bands and rDNA Sites Evolution in Polyploidization Events in Cynodon Rich. (Poaceae).
Ano de publicação: | 2019
Fonte/Imprenta: | Plant Molecular Biology Reporter, v. 37, n. 5-6, p. 477-487, 2019.
DOI: | https://doi.org/10.1007/s11105-019-01173-2
Idioma: | Inglês
Conteúdo: | Cynodon is a genus with a wide distribution in tropical and subtropical areas. Ploidy levels in Cynodon range from diploid to hexaploid; hence, polyploidy is the most important driver of chromosome numbervariation in this genus. After polyploidization, structural rearrangements such as deletions, insertion, or duplications of DNA sequences frequently occur, allowingvariation of chromosome morphology, size, and number. These events might result in a wide diversity of karyotypes, contributing to reproductive isolation, and consequently to speciation. In this study, we investigate the karyotype variation of Cynodon based on comparative cytogenetic analyses. We conducted chromosome counts, DNA quantification, CMA/DAPI double staining, and FISH mapping of 5S and 35S rDNA sites. Cytomolecular data were analyzed in a phylogenetic framework, in order to trace the evolutionary history of the karyotype variation considering polyploidy events in this group. Our results indicate that the most recent common ancestor of Cynodon had two 35S and 5S rDNA sites,two CMA bands,nine DAPI+ bands on the long arm, five DAPI+ bands on the short arm, and three DAPI+ bands in the pericentromeric region. During polyploidization events, therewere losses and gains of heterochromatic sequences mainly on the short arms and centromeric regions.
Palavras-Chave: | Chromossome evolution; Forage grass; Karyotype variation; Ploidy level.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
Registro original: | Embrapa Gado de Leite (CNPGL)
Exemplares: | CNPGL - (24876-1) - UPC - AP - DD -  -  -  - DIS