Data/hora: 23/06/2024 10:18:21

Biblioteca(s): | Embrapa Gado de Corte.
Data corrente: | 30/07/2008
Data da última atualização: | 25/07/2023
Autoria: | CALISTO, V.; FUZINATTO, V. A.; MESSAGE, H. J.; MENDES-BONATO, A. B.; BOLDRINI, K. R.; PAGLIARINI, M. S.; VALLE, C. B. do.
Afiliação: | VERGÍLIO CALISTO, UNIVERSIDADE ESTADUAL DE MARINGÁ; VERIDIANA APARECIDA FUZINATTO, UNIVERSIDADE ESTADUAL DE MARINGÁ; HUGO JOSÉ MESSAGE, UNIVERSIDADE ESTADUAL DE MARINGÁ; ANDRÉA BEATRIZ MENDES-BONATO, UNIVERSIDADE ESTADUAL DE MARINGÁ; KELLEN REGINA BOLDRINI, UNIVERSIDADE ESTADUAL DE MARINGÁ; MARIA SUELY PAGLIARINI, UNIVERSIDADE ESTADUAL DE MARINGÁ; CACILDA BORGES DO VALLE, CNPGC.
Título: | Desynapsis and precocious cytokinesis in Brachiaria humidicola (Poaceae) compromise meiotic division.
Ano de publicação: | 2008
Fonte/Imprenta: | Journal of Genetics, Bangalore, v. 87, n. 1, p. 27-31, Apr. 2008.
Idioma: | Inglês
Notas: | Research article.
Conteúdo: | 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.
Thesagro: | Brachiaria Humidicola; Citogenética Vegetal; Gramínea Forrageira; Meiose; Melhoramento Genético Vegetal; Pastagem; Planta Forrageira.
Thesaurus Nal: | Cytogenetics; Cytokinesis; Forage grasses; Meiosis; Pastures; Plant breeding.
Categoria do assunto: | --
Registro original: | Embrapa Gado de Corte (CNPGC)
Exemplares: | CNPGC - (11991-1) - UPC - AP - -- - 459/12 -  - 459/12 - DIS