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    • Keywords


      Brachiaria humidicola; cytokinesis; desynapsis; meiosis; forage grass; breeding.

    • Abstract


      The forage grass species Brachiaria humidicola is native to African savannas. Owing to its good adaptation to poorly drained and infertile acid soils, it has achieved wide utilization for pastures in Brazilian farms. Among the 55 accessions of B. humidicola analysed from the Embrapa Beef Cattle collection, one (H022), presented desynapsis and an abnormal pattern of cytokinesis in the first meiotic division. Among 28 inflorescences analysed in this accession, 12 were affected by the anomaly. In affected meiocytes, the first cytokinesis occurred in metaphase I and was generally perpendicular to a wide-metaphase plate, dividing the genome into two parts with an equal or unequal number of chromosomes. The normal cytokinesis after telophase I did not occur, and the meiocytes entered metaphase II, progressing to the end of meiosis with the occurrence of the second cytokinesis. As the first cytokinesis occurred precociously, whereas the second was normal, tetrads were formed but with unbalanced chromosome numbers in microspores. Abnormal cytokinesis occurred only in those meiocytes that underwent desynapsis after diakinesis. The implications of this abnormality in the Brachiaria breeding programme are discussed.

    • Author Affiliations


      Vergílio Calisto1 Veridiana Aparecida Fuzinatto1 Hugo José Message1 Andréa Beatriz Mendes-Bonato1 Kellen Regina Boldrini1 Maria Suely Pagliarini1 Cacilda Borges Do Valle2

      1. Department of Cell Biology and Genetics, State University of Maringá, 87020-900 Maringá, Paraná, Brazil
      2. Embrapa Beef Cattle, P.O. Box 154, 79002-970 Campo Grande, Mato Gross do Sul, Brazil
    • Dates

  • Journal of Genetics | News

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      Posted on July 25, 2019

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