Artículo
Genomic affinities in Turnera (subseries Turnera, Turneraceae) inferred by in situ hybridization techniques
Fecha de publicación:
08/2010
Editorial:
National Research Council Canada-NRC Research Press
Revista:
Genome
ISSN:
0831-2796
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Subseries Turnera comprises a polyploid complex with ploidy levels ranging from diploid (2n = 2x = 10) to octoploid (2n = 8x = 40). The use of fluorescent in situ hybridization greatly improved the knowledge of the karyotypes of Turnera species by detecting and mapping rDNA sites. Interspecific variability in the number of sites was detected, but not in correlation with the ploidy level. A chromosome pair with a strong hybridization signal was always visible and this signal corresponded to the secondary constriction detectable by conventional techniques. Genomic in situ hybridization experiments combined with information on meiotic pairing in species and interspecific hybrids revealed that homologies detected by molecular analysis are greater than those detected by chromosome pairing. This suggests that the formation of the allopolyploids could involve species more closely related than previously assumed. Despite the molecular affinity among the genomes, the meiotic pairing is probably controlled by specific genes that restrict homeologous pairing in polyploids.
Palabras clave:
GISH-FISH
,
IN SITU HYBRIDIZATION
,
TURNERA
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(IEGEBA)
Articulos de INSTITUTO DE ECOLOGIA, GENETICA Y EVOLUCION DE BS. AS
Articulos de INSTITUTO DE ECOLOGIA, GENETICA Y EVOLUCION DE BS. AS
Citación
López, Alicia; Fernandez, Aveliano; Poggio, Lidia; Genomic affinities in Turnera (subseries Turnera, Turneraceae) inferred by in situ hybridization techniques; National Research Council Canada-NRC Research Press; Genome; 53; 8; 8-2010; 594-598
Compartir
Altmétricas