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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
16/04/1997 |
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Data da última atualização: |
06/09/2007 |
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Autoria: |
VALLE, C. B. do; SAVIDAN, Y. H. |
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Afiliação: |
EMBRAPA. Centro Nacional de Pesquisa de Gado de Corte (Campo Grande, MS). |
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Título: |
Genetics, cytogenetics and reproductive biology of Brachiaria. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
In: MILES, J.W.; MAASS, B.L.; VALLE, C.B. do, ed. Brachiaria: biology, agronomy and improvement. Cali: CIAT / Brasilia: EMBRAPA-CNPGC, 1996. |
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Páginas: |
p.147-163. |
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Série: |
(CIAT. Pblication, 259). |
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ISBN: |
958-9439-57-8 |
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Idioma: |
Inglês |
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Notas: |
CNPGC. |
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Conteúdo: |
Two essentials for breeding new cultivars of Brachiaria are germplasm devirsity and information on basic biological aspects of major species. This paper reviews current knowledge on the cytological behaviour, mode of reproduction and its inheritance, and crossing compatibility of different species. The two of major agronomic importance - B. decumbens and B. brizzantha-are tetraploid (2n = 4X = 36) and apomictic, that is, the embryo is produced without fusion of male and female gametes. Apomixis, although not common, is found throughout the plant kingdom and is often associated with polyploidy. Hence, it is frequently accompanied by meiotic anomalies leading to reduced pollen fertility. Sexuality has been found at the diploid level in these species and in B.ruziziensis, and is generally associated with regular chromosome pairing and division. As a breeding tool, apomixis affers several advantages, because it associated fixation of hybrids vigor with seed propagation. Apomictic hybrids breed true, and superior genotypes can be rapidly incresed by seed. The discovery of completeley sexual plants in cross-compatible species of Brachiaria and the development of pratica clearing techniques for the observation of ovules prompted studies of inheritance of apomixix. Results suggest a simple, monogenic control of model of reproduction, with apomixis dominant over sexuality. These investigations open up promising new possibilities for manipulating apomixis in breeding programs. |
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Palavras-Chave: |
Biology; Brachiaraia; Melhoramento genetico; Pasture. |
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Thesagro: |
Apomixia; Biologia; Citogenética; Pastagem; Reprodução. |
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Thesaurus Nal: |
apomixis; breeding; cytogenetics; reproduction. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02429naa a2200337 a 4500
001 1321546
005 2007-09-06
008 1996 bl uuuu u00u1 u #d
020 $a958-9439-57-8
100 1 $aVALLE, C. B. do
245 $aGenetics, cytogenetics and reproductive biology of Brachiaria.
260 $c1996
300 $ap.147-163.
490 $a(CIAT. Pblication, 259).
500 $aCNPGC.
520 $aTwo essentials for breeding new cultivars of Brachiaria are germplasm devirsity and information on basic biological aspects of major species. This paper reviews current knowledge on the cytological behaviour, mode of reproduction and its inheritance, and crossing compatibility of different species. The two of major agronomic importance - B. decumbens and B. brizzantha-are tetraploid (2n = 4X = 36) and apomictic, that is, the embryo is produced without fusion of male and female gametes. Apomixis, although not common, is found throughout the plant kingdom and is often associated with polyploidy. Hence, it is frequently accompanied by meiotic anomalies leading to reduced pollen fertility. Sexuality has been found at the diploid level in these species and in B.ruziziensis, and is generally associated with regular chromosome pairing and division. As a breeding tool, apomixis affers several advantages, because it associated fixation of hybrids vigor with seed propagation. Apomictic hybrids breed true, and superior genotypes can be rapidly incresed by seed. The discovery of completeley sexual plants in cross-compatible species of Brachiaria and the development of pratica clearing techniques for the observation of ovules prompted studies of inheritance of apomixix. Results suggest a simple, monogenic control of model of reproduction, with apomixis dominant over sexuality. These investigations open up promising new possibilities for manipulating apomixis in breeding programs.
650 $aapomixis
650 $abreeding
650 $acytogenetics
650 $areproduction
650 $aApomixia
650 $aBiologia
650 $aCitogenética
650 $aPastagem
650 $aReprodução
653 $aBiology
653 $aBrachiaraia
653 $aMelhoramento genetico
653 $aPasture
700 1 $aSAVIDAN, Y. H.
773 $tIn: MILES, J.W.; MAASS, B.L.; VALLE, C.B. do, ed. Brachiaria: biology, agronomy and improvement. Cali: CIAT / Brasilia: EMBRAPA-CNPGC, 1996.
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Embrapa Gado de Corte (CNPGC) |
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| Registros recuperados : 617 | |
| 32. |  | VALLE, C. B. do; SAVIDAN, Y. H. Genetics, cytogenetics and reproductive biology of Brachiaria. In: MILES, J.W.; MAASS, B.L.; VALLE, C.B. do, ed. Brachiaria: biology, agronomy and improvement. Cali: CIAT / Brasilia: EMBRAPA-CNPGC, 1996. p.147-163. (CIAT. Pblication, 259). CNPGC.| Biblioteca(s): Embrapa Gado de Corte. |
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| 33. | | VALLE, C. B. do; PAGLIARINI, M. S. Biology, cytogenetics, and breeding of Brachiaria. In: SINGH, R. J. (Ed.). Genetic resources, chromosome engineering, and crop improvement: forage crops. Boca Raton: CRC, 2009. (Genetic resources, chromosome engineering, and crop improvement series; v. 5). p. 104-151.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Gado de Corte. |
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| Registros recuperados : 617 | |
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