Cytogenetic studies in four cultivated Amaranthus (Amaranthaceae) species
Fecha
2013-03-26Autor
Bonasora, Marisa
Poggio, Lidia
Greizerstein, Eduardo
Metadatos
Mostrar el registro completo del ítemResumen
In the present study, the chromosomes numbers were confirmed, 2n = 34 for Amaranthus cruentus Linnaeus,
1759, and 2n = 32 for A. hypochondriacus Linnaeus, 1753, A. mantegazzianus Passer, 1864, and A.
caudatus Linnaeus, 1753. The distribution and variability of constitutive heterochromatin were detailed
using DAPI-CMA3 banding technique. The position of the nucleolus organizer region (NOR) was observed
using Ag-NOR banding (active loci) and fluorescent in situ hybridization (rDNA-FISH) in the
four Amaranthus species. Variations in the amount of constitutive heterochromatin were detected both
within the species and between them, with DAPI-CMA3 stain. One chromosome pair having a NOR
was found in each studied accession, with exception of A. caudatus cv. EEA INTA Anguil. This accession
presented four rDNA loci (FISH), being active two of them (Ag- banding)