Data/hora: 06/06/2024 06:22:49

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