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Acta Botanica Brasilica

Print version ISSN 0102-3306On-line version ISSN 1677-941X

Abstract

VASCONCELOS, Emanuelle V.; BRASILEIRO-VIDAL, Ana C.; BENKO-ISEPPON, Ana M.  and  VASCONCELOS, Santelmo. Updating the list of chromosome numbers for Philodendron (Araceae). Acta Bot. Bras. [online]. 2017, vol.31, n.2, pp.309-312.  Epub May 02, 2017. ISSN 0102-3306.  http://dx.doi.org/10.1590/0102-33062016abb0431.

Aiming for a better understanding of karyotype evolution within Philodendron, we report chromosome counts for 23 species of the genus, of which 19 are being reported for the first time, thus increasing to 84 ( ca. 17 % of the genus) the total number of species with available chromosome counts. The diploid numbers 2 n = 32 and 2 n = 34 were the most common, with 10 and 11 species, respectively, whereas only two species presented different chromosome numbers ( P. giganteum with 2 n = 30 and P. adamantinum with 2 n = 36). The results are discussed in the context of previous analyses of karyotypes of Philodendron spp., taking into account bidirectional dysploidy as the main mechanism of chromosome number evolution within the genus.

Keywords : aroids; diploid number; dysploidy; karyotype; Philodendron.

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