Chromossome numbers and meiotic behavior of some Paspalum accessions.

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.

Bibliographic Details

Main Authors:	ADAMOWSKI, E. de V., PAGLIARINI, M. S., BONATO, A. B. M., BATISTA, L. A. R., VALLS, J. F. M.
Other Authors:	ELENIZA DE VICTOR ADAMOWSKI, Universidade Paranaense; MARIA SUELY PAGLIARINI, Universidade Estadual de Maringá; ANDRÉA BEATRIZ MENDES BONATO, Universidade Estadual de Maringá; LUIZ ALBERTO ROCHA BATISTA, CPPSE; JOSE FRANCISCO MONTENEGRO VALLS, Cenargen.
Format:	Artigo de periódico biblioteca
Language:	Ingles English
Published:	2006-01-23
Subjects:	Chromosome numbers, Meiotic behavior, Paspalum, Forage grasses,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/41288 https://doi.org/10.1590/S1415-47572005000500020
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