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vol.14 issue2The species of Canomaculina, Myelochroa, Parmeunella, and Parmeunopsis (Parmeliaceae, Lichenized Ascomycotina) from the "segundo planalto" in the state of Paraná, BrazilFloristic and structural analyses of riparian forest of the "Alto Rio Paraná", Taquaruçu, MS author indexsubject indexarticles search
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Acta Botanica Brasilica

Print version ISSN 0102-3306

Abstract

POZZOBON, Marisa Toniolo; VALLS, José Franciso Montenegro  and  SANTOS, Sileuza dos. Chromosome counts in brazilian species of Paspalum L. (Gramineae). Acta Bot. Bras. [online]. 2000, vol.14, n.2, pp.151-162. ISSN 0102-3306.  http://dx.doi.org/10.1590/S0102-33062000000200003.

Germplasm accessions obtained in collecting missions covering all the five regions of Brazil were submitted to cytological analysis, either in mitosis or meiosis. Chromosome numbers are reported from 107 accessions of 33 species, representative of 13 of the informal taxonomic groups, in which the genus is traditionally divided. In the Plicatula group, under intensive taxonomic investigation, 27 accessions are mentioned without any specific identification. The Southern region is very well represented, with 65 accessions, followed by the West Central region, with 33. The chromosome numbers of P. fillfolium (2n = 20), P hartwegianum (2n = 60), P. rhodopedum (2n = 40) and P. wettsteinii (2n - 40 and 60) are reported for the first time. Also new are the reports of 2n = 50 for P. plenum and for a yellow-anthered form of P dilatatum. The new findings include an additional diploid accession of P plicatulum (2n = 20) and a second accession of P. mandiocanum with 2n = 50, a number in disagreement with the most frequent hexaploid level in this species. Additional data confirm previous counts, thus extending their geographic amplitude.

Keywords : Paspalum; Brazil; grasses; somatic number; ploidy level.

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