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      Karyotype analysis in Brachiaria (Poaceae) species.

      1 ,
      Cytobios

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          Abstract

          This is the first karyotype characterization of Brachiaria species. Twelve accessions belonging to five species were analysed. The basic chromosome number was x = 9 and 7, the same reported for the tribe Paniceae. Variations in the chromosome number were observed in B. decumbens (2n = 18; 36) and B. humidicola (2n = 36; 42; 54). Chromosome numbers of 2n = 18 in B. ruziziensis and 2n = 36 in B. brizantha and B. jubata were recorded. Inter- and intraspecific karyotype differentiation of the accessions analysed was facilitated by variations in karyotypic symmetry. The karyotypes were generally considered symmetrical, with a tendency to asymmetry in the direction of the polyploids. It is suggested that addition, deletions and mainly polyploidy have been the most direct causes involved in the chromosome evolution of this genus.

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          Author and article information

          Journal
          Cytobios
          Cytobios
          0011-4529
          0011-4529
          2001
          : 104
          : 407
          Affiliations
          [1 ] Departamento de Biologia Geral, Universidade Estadual de Londrina, PR, Brazil.
          Article
          11318511
          7e9b7f51-e938-4266-a38a-4797d67b6b95
          History

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