Data/hora: 12/06/2024 00:29:34

Biblioteca(s): | Embrapa Semiárido.
Data corrente: | 27/08/1997
Data da última atualização: | 30/04/2018
Autoria: | MELO, N. F. de; GUERRA, M.; BENKO-ISEPPON, A. M.; MENEZES, N. L. de.
Afiliação: | NATONIEL FRANKLIN DE MELO, CPATSA; MARCELO GUERRA; ANA MARIA BENKO-ISEPPON; NANUZA LUIZA DE MENEZES.
Título: | Cytogenetics and cytotaxonomy of Velloziaceae.
Ano de publicação: | 1997
Fonte/Imprenta: | Plant Systematics and Evolution, v. 204, p. 257-273, 1997.
Idioma: | Inglês
Conteúdo: | Chromosome number and other cytological features are reported from 35 species of Velloziaceae, including several african and brazilian populations. All analyzed species show areticulate interphase nuclei and prophase/prometaphase chromosomes with proximal early condensation. Most heteropycnotic blocks do not seem to correspond to heterochromatin since, at least in Vellozia patens, they do not stain differentially after C-banding procedures. Regarding the chromosome number, three main groups could be identified. The first comprised diploid species of the genera Nanuza, Vellozia and the brazilian species of Xerophyta with 2n=14 or 16; the second comprised tetraploid species with 2n=34, and included all brazilian species of subfam. Barbacenioideae; the third group, of hexaploid species, comprised the African representatives of the genus Xerophyta. A single population of Vellozia, possibly of hybrid origin, had 2n~=32. A basic number of x=8 is proposed for the family. The karyological information supports the hypothesis that the Velloziaceae originated on the South American, rather than on the African continent.
Palavras-Chave: | Cytotaxonomy; Heterochromation.
Thesagro: | Citotaxonomia; Cromossoma.
Thesaurus Nal: | chromosomes; Velloziaceae.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/176158/1/Separata-8366.pdf
Registro original: | Embrapa Semiárido (CPATSA)
Exemplares: | CPATSA - (7553-1) - UPC - AP - PP - 01638 -  - 01638 - DIS