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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
26/05/2003 |
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Data da última atualização: |
08/11/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
VANZELA, A. L. L.; RUAS, C. F.; OLIVEIRA, M. F. de; RUAS, P. M. |
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Afiliação: |
MARCELO FERNANDES DE OLIVEIRA, CNPSO. |
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Título: |
Characterization of diploid, tetraploid and hexaploid Helianthus species by chromosome banding and FISH with 45S rDNA probe. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Genetica, v. 114, n. 2, p. 105-111, 2002. |
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Idioma: |
Inglês |
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Conteúdo: |
Comparative karyotype analyses of five diploid, two tetraploid, and three hexaploid species of Helianthus were performed using Feulgen staining, Giemsa C and CMA3 (C-CMA) staining, and FISH with 45S rDNA probe. The karyotypes are composed by a basic number of x=17 with a predominance of meta- and submetacentric chromosome types. A polyploid series is associated with the basic number. Giemsa C- and C-CMA banding revealed terminal or interstitial heterochromatin according to the species, suggesting the existence of a mechanism that may be acting in the dispersion of heterochromatic segments in Helianthus. The nucleolar organizer regions were located at terminal chromosome positions by FISH with 45S rDNA probe. Diploid species presented four, six, and eight rDNA sites, tetraploid species showed eight sites and hexaploid species presented 12 rDNA sites. Karyomorphological differences include variation in number, size and chromosome morphology, suggesting that rearrangements! involving small heterochromatic and rDNA segments played a major role in karyotype evolution. |
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Palavras-Chave: |
Sunflower. |
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Thesagro: |
Cromossoma; Girassol. |
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Thesaurus Nal: |
Chromosome banding. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 01699naa a2200205 a 4500
001 1453404
005 2024-11-08
008 2002 bl uuuu u00u1 u #d
100 1 $aVANZELA, A. L. L.
245 $aCharacterization of diploid, tetraploid and hexaploid Helianthus species by chromosome banding and FISH with 45S rDNA probe.$h[electronic resource]
260 $c2002
520 $aComparative karyotype analyses of five diploid, two tetraploid, and three hexaploid species of Helianthus were performed using Feulgen staining, Giemsa C and CMA3 (C-CMA) staining, and FISH with 45S rDNA probe. The karyotypes are composed by a basic number of x=17 with a predominance of meta- and submetacentric chromosome types. A polyploid series is associated with the basic number. Giemsa C- and C-CMA banding revealed terminal or interstitial heterochromatin according to the species, suggesting the existence of a mechanism that may be acting in the dispersion of heterochromatic segments in Helianthus. The nucleolar organizer regions were located at terminal chromosome positions by FISH with 45S rDNA probe. Diploid species presented four, six, and eight rDNA sites, tetraploid species showed eight sites and hexaploid species presented 12 rDNA sites. Karyomorphological differences include variation in number, size and chromosome morphology, suggesting that rearrangements! involving small heterochromatic and rDNA segments played a major role in karyotype evolution.
650 $aChromosome banding
650 $aCromossoma
650 $aGirassol
653 $aSunflower
700 1 $aRUAS, C. F.
700 1 $aOLIVEIRA, M. F. de
700 1 $aRUAS, P. M.
773 $tGenetica$gv. 114, n. 2, p. 105-111, 2002.
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| Registros recuperados : 787 | |
| 1. |  | ALVES, A. Desafios da pesquisa. Revista de Política Agrícola, Brasília, DF, ano 25, n. 4, p. 165-168, out./nov./dez. 2016. Ponto de Vista.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 3 |
| Biblioteca(s): Embrapa Unidades Centrais. |
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| 19. | | ALVES, A. A. C. Fisiologia da mandioca. Cruz das Almas: EMBRAPA-CNPMF, 1990. 25 p. Trabalho apresentado no 7º Curso Intensivo Nacional de Mandioca, 1990.| Biblioteca(s): Embrapa Mandioca e Fruticultura. |
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| Registros recuperados : 787 | |
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