Localización de satélites y cromosomas NOR para la interpretación del cariotipo de Sesbania virgata (Papilionoideae, Sesbanieae) de dos poblaciones americanas

Research on Sesbania virgata reveals distinct karyotypes between two geographically isolated populations—one from Tlacotalpan, Mexico, and another from Salta, Argentina. The study identified only two secondary constrictions associated with macrosatellites in the short arms of the smallest chromosome pair, contrary to prior assumptions that suggested their location on long arms. Crucially, these regions actively participate in nucleolar organization during prometaphase, confirming their role as nucleolus organizer regions (NORs). This finding aligns with established patterns in plant chromosomes, particularly leguminous species, and suggests ongoing speciation driven by chromosomal arm ratio changes. The study employed surface-spreading and air-drying techniques to analyze root meristem cells, providing a robust methodology for cytogenetic comparison.

Tapia-Pastrana, F., & Tapia-Aguirre, F. (2018). Localización de satélites y cromosomas NOR para la interpretación del cariotipo de Sesbania virgata (Papilionoideae, Sesbanieae) de dos poblaciones americanas. Botanical Sciences, 96(4), 619–627. https://doi.org/10.17129/botsci.1972