Data/hora: 02/06/2024 00:30:36

Provedor de dados: | 74
País: | Brazil
Título: | Chromosome numbers and meiotic behavior of some Paspalum accessions
Autores: | Adamowski,Eleniza de Victor; Pagliarini,Maria Suely; Bonato,Andréa Beatriz Mendes; Batista,Luiz Alberto Rocha; Valls,José Francisco Montenegro.
Data: | 2005-12-01
Ano: | 2005
Palavras-chave: | Paspalum; Forage grass; Chromosome numbers; Meiotic behavior.
Resumo: | Chromosome number and meiotic behavior were evaluated in 36 Brazilian accessions of the grass Paspalum (which had never previously been analyzed) to determinate which accessions might be useful in interspecific hybridizations. The analysis showed that one accession of Paspalum coryphaeum was diploid (2n = 2x = 20) and one accession of Paspalum conspersum hexaploid (2n = 6x = 60), the remaining 34 accessions being tetraploid (2n = 4x = 40). The pairing configuration was typical for the ploidy level i.e. in the diploid, chromosomes paired as 10 bivalents, in tetraploids as bi-, tri- and quadrivalents, and in hexaploid as 30 bivalents. A low frequency of meiotic abnormalities (less than 10%) was observed in the diploid, hexaploid and some tetraploid accessions, although the majority of tetraploid accessions showed a high frequency of meiotic irregularities. The use of accessions with a low frequency of meiotic abnormalities in breeding programs is discussed.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000500020
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47572005000500020
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.28 n.4 2005
Fonte: | info:eu-repo/semantics/openAccess