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Abstract

Karyotypes of two Colocasia oresbia botanical varieties from Bangladesh were analyzed and compared with orcein, chromomycin A 3 (CMA) and 4´-6 diamidino-2-phenylindole (DAPI).Both varieties had 2n= 2 x = 26 chromosomes (karyotypic formula: 20m+ 6sm) and a pair of satellites each. Total chromosome length was 144.18 ± 2.45 μm in C. oresbia var. oresbia and 133.02 ± 2.75 μm in C. oresbia var. stolonifera. The karyotype of Colocasia oresbia var.oresbia is 2A whereas that of C. oresbia var. stolonifera is 1A. Six CMA and four DAPI bands were observed in C. oresbia var. oresbia and eight CMA and six DAPI bands in C. oresbia var. stolonifera. However, in these two morphologically distinct C. oresbia varieties of two different ecological zones, the same somatic chromosome number, diversification in various karyotypic parameters and CMA/DAPI-banding patterns were observed. In addition to taxonomic characters, the studied karyotype features will contribute to the characterization of these two C. oresbia varieties and to establish a base for future research.

Flora exótica presente en áreas silvestres protegidas de Chile

“…El rol que desempeñan las ASP tanto públicas como privadas es esencial para la protección y el mantenimiento de la biodiversidad de un país, no sólo desde el prisma de las especies, sino que también a nivel genético (Jara-Seguel et al, 2020). Entendiendo la trascendencia de dicha tarea, es que resulta indispensable conocer el estado de la biota que albergan estos ambientes y la amenaza que representan las especies exóticas.…”