Data/hora: 16/06/2024 07:16:34

Biblioteca(s): | Embrapa Pecuária Sudeste.
Data corrente: | 20/03/2000
Data da última atualização: | 18/04/2023
Autoria: | PAGLIARINI, M. S.; TAKAYAMA, S. Y.; FREITAS, P. M.; CARRARO, L. R.; SAMOWSKI, E. V.; SILA, N.; BATISTA, L. A. R.
Afiliação: | M. S. PAGLIARINI, UEM; S. Y. TAKAYAMA, UEM; P. M. FREITAS, UEM; L. R. CARRARO, UEM; E. V. ADAMOWSKI, UEM; N. SILVA, UEM; LUIZ ALBERTO ROCHA BATISTA, CPPSE.
Título: | Failure of cytokinesis and 2n gamete formation in Brazilian accessions of Paspalum.
Ano de publicação: | 1999
Fonte/Imprenta: | Euphytica, v. 108, p. 129-135, 1999.
Idioma: | Inglês
Conteúdo: | Cytological analysis on 112 Brazilian accessions of Paspalum showed that 52 were affected by failure of first or second cytokinesis during microsporogenesis. When the failure of cytokinesis occurred only in the first division and in the second division the cytokinesis was normal, a dyad of microspores was formed. In most of them the two cells remained binucleate, but in some a restitutional nucleus was observed. When the first division was normal and the failure of cytokinesis occurred only in the second division, dyads and triads were observed. A restitutional nucleus in one or both cells of the dyad, or in the binucleate cell of the triad was also observed. The percentage of dyads and triads varied among accessions, reaching 15.75 of the sporads in some. The absence of cytokinesis indicates the possibility that the widespread occurrence of polyploidy in the genus Paspalum originates from 2n pollen grains.
Palavras-Chave: | 2n gametes; Cytikinesis; Polyploid.
Thesaurus Nal: | microsporogenesis; Paspalum.
Categoria do assunto: | G Melhoramento Genético
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/229217/1/FailureCytokinesis2n.pdf
Registro original: | Embrapa Pecuária Sudeste (CPPSE)
Exemplares: | CPPSE - (12644-1) - UPC - AP - DD - PROCI-1999.00099 - PAG - 1999.00099 - DIS