Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/59557
Title: Análise citogenômica revela padrões de sequências repetitivas nos cromossomos de espécies do complexo ‘humidicola’ de urochloa p. Beauv
Other Titles: Cytogenomic analysis reveals patterns of repetitivesequences in chromosomes of species of the ‘humidicola’ complex of urochloa p. Beauv
Authors: Techio, Vânia Helena
Torres, Giovana Augusta
Corrêa, Caio Túlio Rodrigues
Nunes, Renata De Castro
Scvortzoff, Magdalena Vaio
Keywords: Brachiaria
SatDNA
Poliploidia
FISH
Issue Date: 9-Oct-2024
Publisher: Universidade Federal de Lavras
Citation: SANTOS, Bruna Natalia Veloso dos. Análise citogenômica revela padrões de sequências repetitivas nos cromossomos de espécies do complexo ‘humidicola’ de urochloa p. Beauv. 2024. 63 p. Tese (Doutorado em Genética e Melhoramento de Plantas) – Universidade Federal de Lavras, Lavras, 2024.
Abstract: The genus Urochloa P. Beauv. (Brachiaria (Trin.) Griseb.), known for its agronomic importance, includes species such as Urochloa humidicola and Urochloa dictyoneura, which form the 'humidicola' complex. These species are noted for their similar morphological characteristics, leading to taxonomic debates regarding their classification. The objective of this study was to located satDNA repetitive sequences on the chromosomes of U. humidicola and U. dictyoneura accessions using fluorescence in situ hybridization (FISH) in order to enhance the understanding of the genome structure and composition. The analyses revealed significant variations in the distribution, intensity, and pattern of FISH signals among the evaluated accessions. The hybridization patterns of satDNA sequences demonstrated substantial genomic complexity, reflecting chromosomal rearrangements and variations in the copy number of repetitive sequences. The comparison between U. humidicola and U. dictyoneura revealed the conservation of certain satDNA sequences, consistent with the "library model," where related species share a repertoire of satDNAs inherited from a common ancestor. However, interspecific variations were also observed, reflecting the rapid evolution of these repetitive elements. The results of this study significantly expand the understanding of the genomic structure and organization of U. humidicola and U. dictyoneura. The identification of distinct satDNA hybridization patterns among cytotypes and species suggests that these markers can be useful in chromosome discrimination and in understanding the evolutionary relationships within the genus Urochloa.
Description: Arquivo retido, a pedido da autora, até outubro de 2025.
URI: http://repositorio.ufla.br/jspui/handle/1/59557
Appears in Collections:Genética e Melhoramento de Plantas - Doutorado (Teses)

Files in This Item:
There are no files associated with this item.


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