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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
11/02/2011 |
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Data da última atualização: |
11/02/2011 |
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Tipo da produção científica: |
Capítulo em Livro Técnico-Científico |
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Autoria: |
VARGAS, L. M. P.; SA, M. A. C. de; MARCHI, G.; MARCHAO, R. L.; GUIMARAES JUNIOR, R.; OLIVEIRA FILHO, E. C. de. |
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Afiliação: |
LUCILIA MARIA PARRON VARGAS, CNPF; MARCOS AURELIO CAROLINO DE SA, CPAC; GIULIANO MARCHI, CPAC; ROBELIO LEANDRO MARCHAO, CPAC; ROBERTO GUIMARAES JUNIOR, CPAC; EDUARDO CYRINO DE OLIVEIRA FILHO, CPAC. |
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Título: |
Impactos dos sistemas de produção e estratégias de mitigação: demandas para a pesquisa. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
In: FALEIRO, F. G.; FARIAS NETO, A. L. (Ed.). Savanas: demandas para pesquisa. Planaltina, DF: Embrapa Cerrados, 2009. 170 p. |
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Páginas: |
p. 69-78 |
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Idioma: |
Português |
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Palavras-Chave: |
Mitigação; Sistemas de produção. |
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Thesagro: |
Cerrado. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00711naa a2200217 a 4500
001 1876740
005 2011-02-11
008 2009 bl uuuu u00u1 u #d
100 1 $aVARGAS, L. M. P.
245 $aImpactos dos sistemas de produção e estratégias de mitigação$bdemandas para a pesquisa.
260 $c2009
300 $ap. 69-78
650 $aCerrado
653 $aMitigação
653 $aSistemas de produção
700 1 $aSA, M. A. C. de
700 1 $aMARCHI, G.
700 1 $aMARCHAO, R. L.
700 1 $aGUIMARAES JUNIOR, R.
700 1 $aOLIVEIRA FILHO, E. C. de
773 $tIn: FALEIRO, F. G.; FARIAS NETO, A. L. (Ed.). Savanas: demandas para pesquisa. Planaltina, DF: Embrapa Cerrados, 2009. 170 p.
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Embrapa Cerrados (CPAC) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Ocidental. Para informações adicionais entre em contato com cpaa.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Ocidental. |
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Data corrente: |
31/10/2011 |
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Data da última atualização: |
31/10/2011 |
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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: |
RABELING, C.; GONZALES, O.; SCHULTZ, T. R.; BACCI JR. M.; GARCIA, M. V. B.; VERHAAGH, M.; ISHAK, H. D. |
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Afiliação: |
Christian Rabeling; Omar Gonzales; Ted R. Schultz; Maurício Bacci Jr.; MARCOS VINICIUS BASTOS GARCIA, CPAA; Manfred Verhaagh; Heather D. Ishak. |
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Título: |
Cryptic sexual populations account for genetic diversity and ecological success in a widely distributed, asexual fungus-growing ant. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Proceedings of the National Academy of Sciences, v. 108, n. 30, p. 12366-12371, Jul., 2011. |
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DOI: |
10.1073/pnas.1105467108 |
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Idioma: |
Inglês |
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Conteúdo: |
Sex and recombination are central processes in life generating genetic diversity. Organisms that rely on asexual propagation risk extinction due to the loss of genetic diversity and the inability to adapt to changing environmental conditions. The fungus-growing ant species Mycocepurus smithii was thought to be obligately asexual because only parthenogenetic populations have been collected from widely separated geographic localities. Nonetheless, M. smithii is ecologically successful, with the most extensive distribution and the highest population densities of any fungus-growing ant. Here we report that M. smithii actually consists of a mosaic of asexual and sexual populations that are nonrandomly distributed geographically. The sexual populations cluster along the Rio Amazonas and the Rio Negro and appear to be the source of independently evolved and widely distributed asexual lineages, or clones. Either apomixis or automixis with central fusion and low recombination rates is inferred to be the cytogenetic mechanism underlying parthenogenesis in M. smithii. Males appear to be entirely absent from asexual populations, but their existence in sexual populations is indicated by the presence of sperm in the reproductive tracts of queens. A phylogenetic analysis of the genus suggests that M. smithii is monophyletic, rendering a hybrid origin of asexuality unlikely. Instead, a mitochondrial phylogeny of sexual and asexual populations suggests multiple independent origins of asexual reproduction, and a divergence-dating analysis indicates that M. smithii evolved 0.5?1.65 million years ago. Understanding the evolutionary origin and maintenance of asexual reproduction in this species contributes to a general understanding of the adaptive significance of sex. MenosSex and recombination are central processes in life generating genetic diversity. Organisms that rely on asexual propagation risk extinction due to the loss of genetic diversity and the inability to adapt to changing environmental conditions. The fungus-growing ant species Mycocepurus smithii was thought to be obligately asexual because only parthenogenetic populations have been collected from widely separated geographic localities. Nonetheless, M. smithii is ecologically successful, with the most extensive distribution and the highest population densities of any fungus-growing ant. Here we report that M. smithii actually consists of a mosaic of asexual and sexual populations that are nonrandomly distributed geographically. The sexual populations cluster along the Rio Amazonas and the Rio Negro and appear to be the source of independently evolved and widely distributed asexual lineages, or clones. Either apomixis or automixis with central fusion and low recombination rates is inferred to be the cytogenetic mechanism underlying parthenogenesis in M. smithii. Males appear to be entirely absent from asexual populations, but their existence in sexual populations is indicated by the presence of sperm in the reproductive tracts of queens. A phylogenetic analysis of the genus suggests that M. smithii is monophyletic, rendering a hybrid origin of asexuality unlikely. Instead, a mitochondrial phylogeny of sexual and asexual populations suggests multiple independent origins of asexual... Mostrar Tudo |
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Palavras-Chave: |
Diversidade genética; Evolução. |
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Thesagro: |
Formiga. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02538naa a2200241 a 4500
001 1904495
005 2011-10-31
008 2011 bl uuuu u00u1 u #d
024 7 $a10.1073/pnas.1105467108$2DOI
100 1 $aRABELING, C.
245 $aCryptic sexual populations account for genetic diversity and ecological success in a widely distributed, asexual fungus-growing ant.
260 $c2011
520 $aSex and recombination are central processes in life generating genetic diversity. Organisms that rely on asexual propagation risk extinction due to the loss of genetic diversity and the inability to adapt to changing environmental conditions. The fungus-growing ant species Mycocepurus smithii was thought to be obligately asexual because only parthenogenetic populations have been collected from widely separated geographic localities. Nonetheless, M. smithii is ecologically successful, with the most extensive distribution and the highest population densities of any fungus-growing ant. Here we report that M. smithii actually consists of a mosaic of asexual and sexual populations that are nonrandomly distributed geographically. The sexual populations cluster along the Rio Amazonas and the Rio Negro and appear to be the source of independently evolved and widely distributed asexual lineages, or clones. Either apomixis or automixis with central fusion and low recombination rates is inferred to be the cytogenetic mechanism underlying parthenogenesis in M. smithii. Males appear to be entirely absent from asexual populations, but their existence in sexual populations is indicated by the presence of sperm in the reproductive tracts of queens. A phylogenetic analysis of the genus suggests that M. smithii is monophyletic, rendering a hybrid origin of asexuality unlikely. Instead, a mitochondrial phylogeny of sexual and asexual populations suggests multiple independent origins of asexual reproduction, and a divergence-dating analysis indicates that M. smithii evolved 0.5?1.65 million years ago. Understanding the evolutionary origin and maintenance of asexual reproduction in this species contributes to a general understanding of the adaptive significance of sex.
650 $aFormiga
653 $aDiversidade genética
653 $aEvolução
700 1 $aGONZALES, O.
700 1 $aSCHULTZ, T. R.
700 1 $aBACCI JR. M.
700 1 $aGARCIA, M. V. B.
700 1 $aVERHAAGH, M.
700 1 $aISHAK, H. D.
773 $tProceedings of the National Academy of Sciences$gv. 108, n. 30, p. 12366-12371, Jul., 2011.
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