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Registro Completo |
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
16/04/2004 |
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Data da última atualização: |
16/04/2004 |
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Autoria: |
FAUQUET, C. M.; FONDONG, V.; PITA, J.; TORES-JEREZ, I.; OTIM-NAPE, W. G.; OGWAL, S.; SANGARE, A.; REY, C.; BROWN, J. K.; BEACHY, R. N. |
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Título: |
Etiology of the cassava mosaic disease in Africa reveals increasing complexity and diversity. |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
Revista Brasileira de Mandioca, Salvador, v. 17, p. 39, nov., 1998., Suplemento. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Since the beginning of this century cassava mosaic disease has been reported in all the African countries growing cassava. Symptoms vary somewhat from one country to the nex but always show mosaic, leaf curl and a significant reduction in yield. The presence of a dramatic new virus epidemic in cassava has caused increasing concern in Uganda since 1986. The new disease induces very severe symptoms, often resulting in total yield loss and failure of cutting establishment from infected stems. Two virus species have been isolated both from these plants and the whitefly vectors; the African cassava mosaic virus (ACMV) and the East African cassava mosaic virus (EACMV). Infection with the former is correlated with mild symptoms whilst presence of the latter causes severe symptoms in the crop. Sequence comparison of the EACMV virus isolate with other cassava viruses revealed that it is a recombinant between EACMV and ACMV. A large sampling of infected cassava plants from Uganda, allowed us to identify mild and severe strains of both irrespective of the symptoms induced on cassava, thereby indicating the absence of correlation between recombination and symptom severety. Comparison of mitochondria DNA sequences from whiteflies collected in each ecological situation indicated that a distinct population of B. tabaci, presently of unknown origin, is correlated with the presence of the severe symptoms and therefore with EACMV/UG. In west Africa the variety of symptoms seen on cassava are difficult to the cassava genotype or to the virus isolate. The two virus species; ACMV and EACMV, have also been isolated in Camerron and in Ivory Coast. A range of symptoms have been recorded in cassava and can now be reproduced on artificial hosts from crude sap and from infectious clones. Studies have revealed that, while ACMV is very similar throughout Africa, EACMV reveals the presence of different recombined fragments of unknown origin. The importance and relevance of these findings relative to symptoms on cassava and the epidemic in Uganda will be discussed. MenosAbstract: Since the beginning of this century cassava mosaic disease has been reported in all the African countries growing cassava. Symptoms vary somewhat from one country to the nex but always show mosaic, leaf curl and a significant reduction in yield. The presence of a dramatic new virus epidemic in cassava has caused increasing concern in Uganda since 1986. The new disease induces very severe symptoms, often resulting in total yield loss and failure of cutting establishment from infected stems. Two virus species have been isolated both from these plants and the whitefly vectors; the African cassava mosaic virus (ACMV) and the East African cassava mosaic virus (EACMV). Infection with the former is correlated with mild symptoms whilst presence of the latter causes severe symptoms in the crop. Sequence comparison of the EACMV virus isolate with other cassava viruses revealed that it is a recombinant between EACMV and ACMV. A large sampling of infected cassava plants from Uganda, allowed us to identify mild and severe strains of both irrespective of the symptoms induced on cassava, thereby indicating the absence of correlation between recombination and symptom severety. Comparison of mitochondria DNA sequences from whiteflies collected in each ecological situation indicated that a distinct population of B. tabaci, presently of unknown origin, is correlated with the presence of the severe symptoms and therefore with EACMV/UG. In west Africa the variety of symptoms seen on c... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 02734naa a2200229 a 4500
001 1651728
005 2004-04-16
008 1998 bl uuuu u00u1 u #d
100 1 $aFAUQUET, C. M.
245 $aEtiology of the cassava mosaic disease in Africa reveals increasing complexity and diversity.
260 $c1998
520 $aAbstract: Since the beginning of this century cassava mosaic disease has been reported in all the African countries growing cassava. Symptoms vary somewhat from one country to the nex but always show mosaic, leaf curl and a significant reduction in yield. The presence of a dramatic new virus epidemic in cassava has caused increasing concern in Uganda since 1986. The new disease induces very severe symptoms, often resulting in total yield loss and failure of cutting establishment from infected stems. Two virus species have been isolated both from these plants and the whitefly vectors; the African cassava mosaic virus (ACMV) and the East African cassava mosaic virus (EACMV). Infection with the former is correlated with mild symptoms whilst presence of the latter causes severe symptoms in the crop. Sequence comparison of the EACMV virus isolate with other cassava viruses revealed that it is a recombinant between EACMV and ACMV. A large sampling of infected cassava plants from Uganda, allowed us to identify mild and severe strains of both irrespective of the symptoms induced on cassava, thereby indicating the absence of correlation between recombination and symptom severety. Comparison of mitochondria DNA sequences from whiteflies collected in each ecological situation indicated that a distinct population of B. tabaci, presently of unknown origin, is correlated with the presence of the severe symptoms and therefore with EACMV/UG. In west Africa the variety of symptoms seen on cassava are difficult to the cassava genotype or to the virus isolate. The two virus species; ACMV and EACMV, have also been isolated in Camerron and in Ivory Coast. A range of symptoms have been recorded in cassava and can now be reproduced on artificial hosts from crude sap and from infectious clones. Studies have revealed that, while ACMV is very similar throughout Africa, EACMV reveals the presence of different recombined fragments of unknown origin. The importance and relevance of these findings relative to symptoms on cassava and the epidemic in Uganda will be discussed.
700 1 $aFONDONG, V.
700 1 $aPITA, J.
700 1 $aTORES-JEREZ, I.
700 1 $aOTIM-NAPE, W. G.
700 1 $aOGWAL, S.
700 1 $aSANGARE, A.
700 1 $aREY, C.
700 1 $aBROWN, J. K.
700 1 $aBEACHY, R. N.
773 $tRevista Brasileira de Mandioca, Salvador$gv. 17, p. 39, nov., 1998., Suplemento.
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Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
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| Registros recuperados : 21 | |
| 3. |  | SILVA, A. H. da; BROSOWSKY, A.; FAVARETTO, N.; CAVALIERI, K.; DIECKOW, J.; PARRON, L. M. Sistemas integrados de produção agrícola: implicações nos atributos físicos do solo e na perda de solo e água via escoamento superficial. In: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 34., 2013, Florianópolis. Ciência do solo: para quê e para quem: anais. Florianópolis: Sociedade Brasileira de Ciência do Solo, 2013. 4 p.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Florestas. |
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| 4. | | FAVARETTO, N.; MORAES, A. de; MOTTA, A. C. V.; PREVEDELLO, B. M. S. Efeito da revegetação e da adubação de area degradada na fertilidade do solo e nas características da palhada. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 35, n. 2, p. 289-297, fev. 2000. Título em inglês: Effect of revegetation and of fertilization of degraded area on soil fertility and on characteristic of straw mulch.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 8. | | MARTÍNI, A. F.; FAVARETTO, N.; DE BONA, F. D.; GONCALVES, A. O. Perda de água e sedimentos em microbacias hidrográficas agrícolas na região subtropical do Brasil. In: REUNIÃO BRASILEIRA DE MANEJO E CONSERVAÇÃO DO SOLO E DA ÁGUA, 20., 2016, Foz do Iguaçu. O solo sob ameaça: conexões necessárias ao manejo e conservação do solo e água: anais. Curitiba: SBCS, NEPAR; Londrina: IAPAR, 2016. Sessão Manejo e conservação do solo e da água, p. 489-491.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Solos; Embrapa Trigo. |
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| 11. | | RAMOS, M. R.; FAVARETTO, N.; UHLMANN, A.; DIECKOW, J.; VEZZANI, F.; ALMEIDA, L. de. Produção de hortaliças no sistema orgânico: efeito nos atributos físicos do solo. Revista de Ciências Agrárias, v. 58, n. 1, p. 45-51, jan./mar. 2015.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 2 |
| Biblioteca(s): Embrapa Florestas. |
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| 12. | | PARRON, L. M.; FAVARETTO, N.; PORFIRIO-DA-SILVA, V.; RODRIGUES, L. N.; FRITZSONS, E.; GOMES, J. B. V. Avaliação de indicadores associados à conservação dos recursos hídricos em distintos sistemas de uso da terra para valoração de serviços ambientais. In: SEMINÁRIO DA REDE AGROHIDRO, 1., 2012, Rio de Janeiro. Água: desafios para a sustentabilidade da agricultura: anais. Rio de Janeiro: Embrapa Solos, 2014. 83 p. (Embrapa Solos. Documentos, 167). p. 22-24.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Cerrados. |
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| 13. | | PARRON, L. M.; FAVARETTO, N.; PORFIRIO-DA-SILVA, V.; RODRIGUES, L. N.; FRITZSONS, E.; GOMES, J. B. V. Avaliação de indicadores associados à conservação dos recursos hídricos em distintos sistemas de uso da terra para valoração de serviços ambientais. In: SEMINÁRIO DA REDE AGROHIDRO, 1., 2012, Rio de Janeiro. Água: desafios para a sustentabilidade da agricultura: anais. Rio de Janeiro: Embrapa Solos, 2014. 83 p. (Embrapa Solos. Documentos, 167). p. 22-24.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Florestas. |
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| 18. | | SILVA, H. da; FAVARETTO, N.; CAVALIERI, K. M. V.; DIECKOW, J.; VEZZANI, F. M.; PARRON, L. M.; CHEROBIM, V. F.; MARIOTI, J.; FERRARI NETO, H. Atributos físicos do solo e escoamento superficial como indicadores de serviços ambientais. In: PARRON, L. M.; GARCIA, J. R.; OLIVEIRA, E. B. de; BROWN, G. G.; PRADO, R. B. (Ed.). Serviços ambientais em sistemas agrícolas e florestais do Bioma Mata Atlântica. Brasília, DF : Embrapa, 2015. p. 71-83. Capítulo 5.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Florestas. |
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| 19. | | PARRON, L. M.; GARCIA, J. R.; FAVARETTO, N.; MAIA, C. M. B. de F.; BROWN, G. G.; CARDOSO, D. J.; PORFIRIO-DA-SILVA, V. Assessment of indicators of ecosystem services across a gradient of land uses in Southern Brazil. Pesquisa Florestal Brasileira, Colombo, v. 39, (nesp), e201902043, 2019. p. 493-494. Edição especial dos resumos do IUFRO World Congress, 25., 2019, Curitiba.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Florestas. |
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| 20. | | SILVA, A. H. da; GOULARTE, G. D.; FAVARETTO, N.; CAVALIERI, K. M. V.; PARRON, L. M.; SOUZA, M. T. de; CABRAL, A. C. F. B.; LOPES, B. G. Estabilidade de agregados do solo: implicações na avaliação da qualidade física em sistemas agrícolas complexos. In: REUNIÃO PARANAENSE DE CIÊNCIA DO SOLO, 4., 2015, Cascavel. Desafios da ciência do solo no contexto das diferentes agriculturas do Paraná: resumos. Curitiba: Sociedade Paranaense de Ciência do Solo, 2015. p. 427. Disponível na internet.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Florestas. |
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| Registros recuperados : 21 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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