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Registro Completo |
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Biblioteca(s): |
Embrapa Agropecuária Oeste. |
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Data corrente: |
13/07/2006 |
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Data da última atualização: |
10/02/2017 |
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Autoria: |
PORTO, E. R.; BRITO, L. T. de L.; ANJOS, J. B. dos; SILVA, M. S. L. da. |
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Título: |
Cisternas. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
Brasília, DF: Embrapa Informação Tecnológica, [2004]. |
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Páginas: |
12 p. |
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Descrição Física: |
il. |
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Série: |
(ABC da agricultura familiar. Formas de garantir água nas secas, 3). |
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Idioma: |
Português |
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Palavras-Chave: |
Reserva de água. |
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Thesagro: |
Cisterna. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00532nam a2200181 a 4500
001 1245227
005 2017-02-10
008 2004 bl uuuu u0uu1 u #d
100 1 $aPORTO, E. R.
245 $aCisternas.
260 $aBrasília, DF: Embrapa Informação Tecnológica, [2004].$c2004
300 $a12 p.$cil.
490 $a(ABC da agricultura familiar. Formas de garantir água nas secas, 3).
650 $aCisterna
653 $aReserva de água
700 1 $aBRITO, L. T. de L.
700 1 $aANJOS, J. B. dos
700 1 $aSILVA, M. S. L. da
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Registro original: |
Embrapa Agropecuária Oeste (CPAO) |
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Registro Completo
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Biblioteca(s): |
Embrapa Arroz e Feijão; Embrapa Recursos Genéticos e Biotecnologia. |
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Data corrente: |
16/11/2010 |
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Data da última atualização: |
02/09/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
PESSOA-FILHO, M.; RANGEL, P. H. N.; FERREIRA, M. E. |
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Afiliação: |
MARCO PESSOA-FILHO, UNB; PAULO HIDEO NAKANO RANGEL, CNPAF; MARCIO ELIAS FERREIRA, CENARGEN. |
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Título: |
Extracting samples of high diversity from thematic collections of large gene banks using a genetic-distance based approach. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
BMC Plant Biology, v. 10, 127, Jun. 2010. |
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DOI: |
https://doi.org/10.1186/1471-2229-10-127 |
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Idioma: |
Inglês |
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Conteúdo: |
Background Breeding programs are usually reluctant to evaluate and use germplasm accessions other than the elite materials belonging to their advanced populations. The concept of core collections has been proposed to facilitate the access of potential users to samples of small sizes, representative of the genetic variability contained within the gene pool of a specific crop. The eventual large size of a core collection perpetuates the problem it was originally proposed to solve. The present study suggests that, in addition to the classic core collection concept, thematic core collections should be also developed for a specific crop, composed of a limited number of accessions, with a manageable size. Results The thematic core collection obtained meets the minimum requirements for a core sample - maintenance of at least 80% of the allelic richness of the thematic collection, with, approximately, 15% of its size. The method was compared with other methodologies based on the M strategy, and also with a core collection generated by random sampling. Higher proportions of retained alleles (in a core collection of equal size) or similar proportions of retained alleles (in a core collection of smaller size) were detected in the two methods based on the M strategy compared to the proposed methodology. Core sub-collections constructed by different methods were compared regarding the increase or maintenance of phenotypic diversity. No change on phenotypic diversity was detected by measuring the trait "Weight of 100 Seeds", for the tested sampling methods. Effects on linkage disequilibrium between unlinked microsatellite loci, due to sampling, are discussed. Conclusions Building of a thematic core collection was here defined by prior selection of accessions which are diverse for the trait of interest, and then by pairwise genetic distances, estimated by DNA polymorphism analysis at molecular marker loci. The resulting thematic core collection potentially reflects the maximum allele richness with the smallest sample size from a larger thematic collection. As an example, we used the development of a thematic core collection for drought tolerance in rice. It is expected that such thematic collections increase the use of germplasm by breeding programs and facilitate the study of the traits under consideration. The definition of a core collection to study drought resistance is a valuable contribution towards the understanding of the genetic control and the physiological mechanisms involved in water use efficiency in plants. MenosBackground Breeding programs are usually reluctant to evaluate and use germplasm accessions other than the elite materials belonging to their advanced populations. The concept of core collections has been proposed to facilitate the access of potential users to samples of small sizes, representative of the genetic variability contained within the gene pool of a specific crop. The eventual large size of a core collection perpetuates the problem it was originally proposed to solve. The present study suggests that, in addition to the classic core collection concept, thematic core collections should be also developed for a specific crop, composed of a limited number of accessions, with a manageable size. Results The thematic core collection obtained meets the minimum requirements for a core sample - maintenance of at least 80% of the allelic richness of the thematic collection, with, approximately, 15% of its size. The method was compared with other methodologies based on the M strategy, and also with a core collection generated by random sampling. Higher proportions of retained alleles (in a core collection of equal size) or similar proportions of retained alleles (in a core collection of smaller size) were detected in the two methods based on the M strategy compared to the proposed methodology. Core sub-collections constructed by different methods were compared regarding the increase or maintenance of phenotypic diversity. No change on phenotypic diversity was detected by measu... Mostrar Tudo |
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Palavras-Chave: |
Core collection; Variabilidade genética. |
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Thesagro: |
Arroz; Banco de germoplasma; Biodiversidade; Melhoramento Genético Vegetal; Oryza sativa. |
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Thesaurus NAL: |
Gene banks. |
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Categoria do assunto: |
S Ciências Biológicas |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/23588/1/BMC.pdf
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Marc: |
LEADER 03334naa a2200253 a 4500
001 1867069
005 2022-09-02
008 2010 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1186/1471-2229-10-127$2DOI
100 1 $aPESSOA-FILHO, M.
245 $aExtracting samples of high diversity from thematic collections of large gene banks using a genetic-distance based approach.
260 $c2010
520 $aBackground Breeding programs are usually reluctant to evaluate and use germplasm accessions other than the elite materials belonging to their advanced populations. The concept of core collections has been proposed to facilitate the access of potential users to samples of small sizes, representative of the genetic variability contained within the gene pool of a specific crop. The eventual large size of a core collection perpetuates the problem it was originally proposed to solve. The present study suggests that, in addition to the classic core collection concept, thematic core collections should be also developed for a specific crop, composed of a limited number of accessions, with a manageable size. Results The thematic core collection obtained meets the minimum requirements for a core sample - maintenance of at least 80% of the allelic richness of the thematic collection, with, approximately, 15% of its size. The method was compared with other methodologies based on the M strategy, and also with a core collection generated by random sampling. Higher proportions of retained alleles (in a core collection of equal size) or similar proportions of retained alleles (in a core collection of smaller size) were detected in the two methods based on the M strategy compared to the proposed methodology. Core sub-collections constructed by different methods were compared regarding the increase or maintenance of phenotypic diversity. No change on phenotypic diversity was detected by measuring the trait "Weight of 100 Seeds", for the tested sampling methods. Effects on linkage disequilibrium between unlinked microsatellite loci, due to sampling, are discussed. Conclusions Building of a thematic core collection was here defined by prior selection of accessions which are diverse for the trait of interest, and then by pairwise genetic distances, estimated by DNA polymorphism analysis at molecular marker loci. The resulting thematic core collection potentially reflects the maximum allele richness with the smallest sample size from a larger thematic collection. As an example, we used the development of a thematic core collection for drought tolerance in rice. It is expected that such thematic collections increase the use of germplasm by breeding programs and facilitate the study of the traits under consideration. The definition of a core collection to study drought resistance is a valuable contribution towards the understanding of the genetic control and the physiological mechanisms involved in water use efficiency in plants.
650 $aGene banks
650 $aArroz
650 $aBanco de germoplasma
650 $aBiodiversidade
650 $aMelhoramento Genético Vegetal
650 $aOryza sativa
653 $aCore collection
653 $aVariabilidade genética
700 1 $aRANGEL, P. H. N.
700 1 $aFERREIRA, M. E.
773 $tBMC Plant Biology$gv. 10, 127, Jun. 2010.
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Embrapa Arroz e Feijão (CNPAF) |
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