Chromosome number and microsporogenesis of two accessions of Brachiaria dura Stapf (Poaceae)

Authors

  • Claudiceia Risso-Pascotto Universidade Estadual de Maringá, Departamento de Biologia Celular e Genética
  • Maria Suely Pagliarini Universidade Estadual de Maringá, Departamento de Biologia Celular e Genética
  • Cacilda Borges do Valle Embrapa Gado de Corte, 79002-970

Keywords:

Brachiaria dura, meiosis, chromosome number, cytomixis

Abstract

The two accessions of B. dura analyzed (DU01 and DU02) are hexaploid (2n = 6x = 54), derived from x = 9. Meiotic abnormalities, such as precocious chromosome migration to the poles, laggards and micronuclei, were recorded in low frequency in both accessions. The few multivalent chromosome association at diakinesis and meiotic stability suggested that hexaploidy probably resulted from chromosome doubling. In DU02, chromosome transfer (cytomixis) among meiocytes, involving part or the entire genome was observed. The implication of these findings for the Brachiaria breeding is discussed.
Issue Cover Vol.: 9 Num: 2

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Published

2009-06-01

How to Cite

Risso-Pascotto, C., Pagliarini, M. S., & Valle, C. B. do. (2009). Chromosome number and microsporogenesis of two accessions of Brachiaria dura Stapf (Poaceae). Biota Neotropica, 9(2). Retrieved from //www.biotaneotropica.org.br/BN/article/view/508

Issue

Vol. 9 No. 2 (2009): v9n2

Section

Short Communications