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Registro Completo
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Biblioteca(s): |
Embrapa Semiárido. |
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Data corrente: |
27/08/1997 |
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Data da última atualização: |
30/04/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Internacional - B |
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Autoria: |
MELO, N. F. de; GUERRA, M.; BENKO-ISEPPON, A. M.; MENEZES, N. L. de. |
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Afiliação: |
NATONIEL FRANKLIN DE MELO, CPATSA; MARCELO GUERRA; ANA MARIA BENKO-ISEPPON; NANUZA LUIZA DE MENEZES. |
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Título: |
Cytogenetics and cytotaxonomy of Velloziaceae. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Plant Systematics and Evolution, v. 204, p. 257-273, 1997. |
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Idioma: |
Inglês |
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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. |
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Palavras-Chave: |
Cytotaxonomy; Heterochromation. |
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Thesagro: |
Citotaxonomia; Cromossoma. |
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Thesaurus NAL: |
chromosomes; Velloziaceae. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/176158/1/Separata-8366.pdf
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Marc: |
LEADER 01728naa a2200229 a 4500
001 1132531
005 2018-04-30
008 1997 bl uuuu u00u1 u #d
100 1 $aMELO, N. F. de
245 $aCytogenetics and cytotaxonomy of Velloziaceae.
260 $c1997
520 $aChromosome 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.
650 $achromosomes
650 $aVelloziaceae
650 $aCitotaxonomia
650 $aCromossoma
653 $aCytotaxonomy
653 $aHeterochromation
700 1 $aGUERRA, M.
700 1 $aBENKO-ISEPPON, A. M.
700 1 $aMENEZES, N. L. de
773 $tPlant Systematics and Evolution$gv. 204, p. 257-273, 1997.
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Embrapa Semiárido (CPATSA) |
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