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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
08/08/2000 |
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Data da última atualização: |
01/11/2013 |
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Autoria: |
GOEDERT, C. O. |
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Título: |
Seed dormancy of tropical forage grasses and implications for the conservation of genetic resource. |
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Ano de publicação: |
1984 |
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Fonte/Imprenta: |
Reading: University of Reading, 1984. |
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Idioma: |
Inglês |
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Notas: |
Tese Doutorado. |
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Conteúdo: |
Investigation are described on the characteristics of tropical grass seeds affect their management, particularly in genebanks. Five tropical forage grass species were selected for study Brachiaria humidicola, Brachiaria decumbens, Panicum maximum, Paspalum guenoarum and Andropogon gayanus. It is shown that germination tests currently provide the best basis for monitoring viability. However two problems are particularly prevalent in tropical grasses which hinder the nterpretation of germination tests; first, freshly harvested seeds often show low purity (i.e. a high proportion of immature and empty spikelets); and secondly, many of the true seeds often show pronounced dormancy (i.e. though viable they are incapable of germination without special stimuli). Investigation of the purity problems showed that in can be overcome with the use of X-ray equipament, but other methods are unreliable. Investigation of the dormancy problem led to the conclusion that advantage needs to be taken of the interaction of several dormancy-breaking agents. It is shown that simultaneous use of three of these are specially valuable alternating-temperatures, linght and nitrate ions. In particular it is important to define the optimum characteristics of alternative-temperature regimes for maximum stimulation of germination. Techniques for doing this were developed using a two-way temperature-gradient plate. Amplitude and thermoperiod were both shown to be particularly important attributes and, although the optima for each species investigated differed in detail, in no case did any optimum diverge far from a regime in which seeds were subjected to diurnal cycles of 20h at 15o and 4h at 35oC in the presence of 10-2 M KNO3 and intermittent illumination. The significance of these and other experimental results are discussed in relation to seed physiology and to the problems of the management of seed accessions in genebanks for genetic conservation. MenosInvestigation are described on the characteristics of tropical grass seeds affect their management, particularly in genebanks. Five tropical forage grass species were selected for study Brachiaria humidicola, Brachiaria decumbens, Panicum maximum, Paspalum guenoarum and Andropogon gayanus. It is shown that germination tests currently provide the best basis for monitoring viability. However two problems are particularly prevalent in tropical grasses which hinder the nterpretation of germination tests; first, freshly harvested seeds often show low purity (i.e. a high proportion of immature and empty spikelets); and secondly, many of the true seeds often show pronounced dormancy (i.e. though viable they are incapable of germination without special stimuli). Investigation of the purity problems showed that in can be overcome with the use of X-ray equipament, but other methods are unreliable. Investigation of the dormancy problem led to the conclusion that advantage needs to be taken of the interaction of several dormancy-breaking agents. It is shown that simultaneous use of three of these are specially valuable alternating-temperatures, linght and nitrate ions. In particular it is important to define the optimum characteristics of alternative-temperature regimes for maximum stimulation of germination. Techniques for doing this were developed using a two-way temperature-gradient plate. Amplitude and thermoperiod were both shown to be particularly important attributes and, althoug... Mostrar Tudo |
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Palavras-Chave: |
Forrageira; Genetic resource; Grass; Pastagem tropical; Seed physiology; Tropical pasture. |
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Thesagro: |
Agricultura; Agronomia; Germinação; Horticultura; Planta Forrageira; Recurso Genético; Semente. |
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Thesaurus Nal: |
agriculture; agronomy; forage. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02783nam a2200313 a 4500
001 1323316
005 2013-11-01
008 1984 bl uuuu m 00u1 u #d
100 1 $aGOEDERT, C. O.
245 $aSeed dormancy of tropical forage grasses and implications for the conservation of genetic resource.
260 $aReading: University of Reading$c1984
500 $aTese Doutorado.
520 $aInvestigation are described on the characteristics of tropical grass seeds affect their management, particularly in genebanks. Five tropical forage grass species were selected for study Brachiaria humidicola, Brachiaria decumbens, Panicum maximum, Paspalum guenoarum and Andropogon gayanus. It is shown that germination tests currently provide the best basis for monitoring viability. However two problems are particularly prevalent in tropical grasses which hinder the nterpretation of germination tests; first, freshly harvested seeds often show low purity (i.e. a high proportion of immature and empty spikelets); and secondly, many of the true seeds often show pronounced dormancy (i.e. though viable they are incapable of germination without special stimuli). Investigation of the purity problems showed that in can be overcome with the use of X-ray equipament, but other methods are unreliable. Investigation of the dormancy problem led to the conclusion that advantage needs to be taken of the interaction of several dormancy-breaking agents. It is shown that simultaneous use of three of these are specially valuable alternating-temperatures, linght and nitrate ions. In particular it is important to define the optimum characteristics of alternative-temperature regimes for maximum stimulation of germination. Techniques for doing this were developed using a two-way temperature-gradient plate. Amplitude and thermoperiod were both shown to be particularly important attributes and, although the optima for each species investigated differed in detail, in no case did any optimum diverge far from a regime in which seeds were subjected to diurnal cycles of 20h at 15o and 4h at 35oC in the presence of 10-2 M KNO3 and intermittent illumination. The significance of these and other experimental results are discussed in relation to seed physiology and to the problems of the management of seed accessions in genebanks for genetic conservation.
650 $aagriculture
650 $aagronomy
650 $aforage
650 $aAgricultura
650 $aAgronomia
650 $aGerminação
650 $aHorticultura
650 $aPlanta Forrageira
650 $aRecurso Genético
650 $aSemente
653 $aForrageira
653 $aGenetic resource
653 $aGrass
653 $aPastagem tropical
653 $aSeed physiology
653 $aTropical pasture
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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| Registros recuperados : 56 | |
| 6. |  | GOEDERT, C. O. Rede Nacional de Recursos Genéticos - Brasil. In: SIMPOSIO DE RECURSOS GENÉTICOS PARA AMÉRICA LATINA Y EL CARIBE, SIRGEALC, 5., 2005, Montevideo, Uruguay. Resúmenes... Montevideo: Instituto Nacional de Investigación Agropecuaria: Universidad de la República, Facultad de Agronomía, 2005. p. 29.| Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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| 9. | | GOEDERT, C. O. Temperatura do planossolo em Pelotas, Rio Grande do Sul. Pesquisa Agropecuária Brasileira, Rio de Janeiro, v. 6, p. 9-16, 1971. (Agronomia, 4). Título em inglês: Planosol temperature in Pelotas, Rio Grande do Sul, Brazil.
A partir do v. 3(1968) é constituída de duas partes: Série Agronomia e Série Veterinária, publicadas também separadamente.| Biblioteca(s): Área de Informação da Sede. |
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| 11. | | SILVA, R. C.; GOEDERT, C. O. Conservação a longo prazo de germoplasma semente de cevada (Hordeum vulgare L.). In : ENCONTRO DO TALENTO ESTUDANTIL DA EMBRAPA RECURSOS GENÉTICOS E BIOTECNOLOGIA, 12., 2007, Brasília, DF. Anais: resumos dos trabalhos. Brasília, DF: Embrapa Recursos Genéticos e Biotecnologia, 2007. p. 194. Disponível também em: SIMPÓSIO DE RECURSOS GENÉTICOS PARA AMÉRICA LATINA Y EL CARIBE, SIRGEALC, 6., 2007, Chapingo, México. Por la valoración de los recursos genéticos para el desarrollo sustentable en América Latina y el Caribe: memoria....| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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| 19. | | GOEDERT, C. O.; WETZEL, M. M. V. S. Banco de cultivares de EMBRAPA - BCE. In: SIMPOSIO DE RECURSOS GENÉTICOS PARA AMÉRICA LATINA Y EL CARIBE, SIRGEALC, 5., 2005, Montevideo, Uruguay. Resúmenes... Montevideo: Instituto Nacional de Investigación Agropecuaria: Universidad de la República, Facultad de Agronomía, 2005. p. 28.| Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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| 20. | | GOEDERT, C. O.; VALLS, J. F. M.; VEIGA, R. F. de A. Biodiversidad y recursos genéticos. In: IICA (Montevideo, Uruguay). El cambio global y el desarrollo tecnologico agropecuario y agroindustrial del Cono Sur: implicancias para los INIAs y el PROCISUR. Montevideo: PROCISUR, 1997. p. 65-69. Presentaciones y conclusiones del Foro Estrategico realizado por el PROCISUR 18-19 de noviembre de 1996, Solis (Maldonado), Uruguay.| Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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| Registros recuperados : 56 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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