Abstract

JARA-SEGUEL, P et al. Chromosome number variation in part of the flora of protected wild areas in the Araucania region of southern Chile. BAG, J. basic appl. genet. [online]. 2020, vol.31, n.2, pp.27-38. ISSN 1852-6233.  http://dx.doi.org/10.35407/bag.2020.31.02..

An analysis was made of the correspondence between species diversity and chromosome number (CN) diversity across 13 Protected Wild Areas (PWA) in the Araucanía Region of southern Chile, encompassing 84 plant species with available cytogenetic data. Our aim was to establish whether higher species diversity within a PWA entails higher CN variation as based on the index of chromosome number heterogeneity (ICNH). The CN data were extracted from databases for Chilean plants, and the ICNH for the flora of each PWA was calculated. Results showed that in nine PWA the species diversity clearly correlates with CN diversity. However, four PWA do not fit this trend. The percentage of species with CN data varied between 9.6% and 24.5% among PWA, with 11 PWA presenting percentages higher than 11%. A 27.3% of the Chilean vascular plant species with available cytogenetic data were studied here for the 13 PWA. The results obtained by studying one part of the flora with available CN data suggest that the PWA could be an important reservoir of genetic diversity at a chromosome level, thus justifying the protective role of the PWA as biodiversity conservation sites.

Keywords : Chromosome number heterogeneity; Floristic diversity; Chilean flora.

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