Genomic characterisation of arachis porphyrocalyx (valls & C.E. Simpson, 2005) (leguminosae) : multiple origin of arachis species with x = 9
Fecha
2017Autor
Silvestri, María Celeste
Ortíz, Alejandra Marcela
Robledo, Germán Ariel
Montenegro Valls, José Francisco
Lavia, Graciela Inés
Metadatos
Mostrar el registro completo del ítemResumen
The genus Arachis Linnaeus, 1753 comprises four species with x = 9, three belong to the section Arachis:
Arachis praecox (Krapov. W.C. Greg. & Valls, 1994), Arachis palustris (Krapov. W.C. Greg. & Valls, 1994)
and Arachis decora (Krapov. W.C. Greg. & Valls, 1994) and only one belongs to the section Erectoides:
Arachis porphyrocalyx (Valls & C.E. Simpson, 2005). Recently, the x = 9 species of section Arachis have
been assigned to G genome, the latest described so far. The genomic relationship of A. porphyrocalyx with
these species is controversial. In the present work, we carried out a karyotypic characterisation of A. porphyrocalyx
to evaluate its genomic structure and analyse the origin of all x = 9 Arachis species. Arachis porphyrocalyx
showed a karyotype formula of 14m+4st, one pair of A chromosomes, satellited chromosomes
type 8, one pair of 45S rDNA sites in the SAT chromosomes, one pair of 5S rDNA sites and pericentromeric
C-DAPI+ bands in all chromosomes. Karyotype structure indicates that A. porphyrocalyx does not
share the same genome type with the other three x = 9 species and neither with the remaining Erectoides
species. Taking into account the geographic distribution, morphological and cytogenetic features, the
origin of species with x = 9 of the genus Arachis cannot be unique; instead, they originated at least twice
in the evolutionary history of the genus.
Colecciones
- Artículos de revista [673]