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).
Bonasora, M. G., Poggio, L., & Greizerstein, E. J. (2013). Cytogenetic studies in four cultivated Amaranthus (Amaranthaceae) species. Comparative Cytogenetics,7, (1),p.53-61
10.3897/CompCytogen.v7i1.4276
Bonasora, Marisa Graciela, Poggio, Lidia, Greizerstein, Eduardo José. 2013. "Cytogenetic studies in four cultivated Amaranthus (Amaranthaceae) species". Comparative Cytogenetics 7, no.1:53-61.
Recuperado de http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2013bonasora