| |
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Café. Para informações adicionais entre em contato com biblioteca@embrapa.br. |
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Café. |
|
Data corrente: |
14/03/2011 |
|
Data da última atualização: |
14/04/2011 |
|
Tipo da produção científica: |
Artigo em Anais de Congresso |
|
Autoria: |
RAMIRO, D. A.; ESCOUTE, J.; PETITOT, A.-S.; MALUF, M. P.; FERNANDEZ, D. |
|
Afiliação: |
IRD; CIRAD; IRD; MIRIAN PEREZ MALUF, SAPC; IRD/CIRAD. |
|
Título: |
Early haustoria development in coffee (Coffea arabica) - rust (hemileia vastatrix) interaction. |
|
Ano de publicação: |
2008 |
|
Fonte/Imprenta: |
In: INTERNATIONAL CONFERENCE ON COFFEE SCIENCE, 22. 2008, Campinas, São Paulo, Brazil. |
|
Idioma: |
Inglês |
|
Conteúdo: |
According to their lifestyle, plants parasitic fungi may be classified in necrotrophs which obtain nutrients from dead cells or biotrophs which obtain nutrients from living host tissue. A common feature of the biotrophs is the formation of specialized structures called haustoria, which are responsible for uptake of nutrients from the host cells they invaded. Avirulence (Avr) genes and their respective products that are recognized by the resistance proteins inside host cells may be specifically expressed in haustoria, leading to the rapid activation of defense responses against the fungus. The objective of this study was to assess the time-course of the orange rust fungus (Hemileia vastatrix) haustoria differentiation in coffee (Coffea arabica). Histological characterization of H. vastatrix (race II) development in Tupi (immune) and Catuai (sporulation level 4) was assessed by light microscopy examination of cross sections of infected leaf fragments stained with lactophenol blue. In both interactions, careful examination of infection sites made at 600x revealed that haustorial differentiation occurred as soon as the fungus enters stomata, much earlier than previously described in the literature. Haustorium mother cell (HMC) and haustoria (termed “pioneers haustoria”) were found in the guard and adjacent cells of the stomata, before the colonization of parenchyma had occurred. In all interactions, after pioneer haustoria differentiation, the fungus displayed the usual sequence of growth stages: anchor, new HMC and haustoria development in stomatal cells and in the parenchyma. Until 36 hours after inoculation, rust development in the two cultivars did not differ. Examination of host cell death, characteristic of the hypersensitive reaction in resistant varieties, and of defense genes regulation during rust infection are currently being examined to assess the coffee resistance responses linked to pioneers haustoria formation. MenosAccording to their lifestyle, plants parasitic fungi may be classified in necrotrophs which obtain nutrients from dead cells or biotrophs which obtain nutrients from living host tissue. A common feature of the biotrophs is the formation of specialized structures called haustoria, which are responsible for uptake of nutrients from the host cells they invaded. Avirulence (Avr) genes and their respective products that are recognized by the resistance proteins inside host cells may be specifically expressed in haustoria, leading to the rapid activation of defense responses against the fungus. The objective of this study was to assess the time-course of the orange rust fungus (Hemileia vastatrix) haustoria differentiation in coffee (Coffea arabica). Histological characterization of H. vastatrix (race II) development in Tupi (immune) and Catuai (sporulation level 4) was assessed by light microscopy examination of cross sections of infected leaf fragments stained with lactophenol blue. In both interactions, careful examination of infection sites made at 600x revealed that haustorial differentiation occurred as soon as the fungus enters stomata, much earlier than previously described in the literature. Haustorium mother cell (HMC) and haustoria (termed “pioneers haustoria”) were found in the guard and adjacent cells of the stomata, before the colonization of parenchyma had occurred. In all interactions, after pioneer haustoria differentiation, the fungus displayed the usual sequence... Mostrar Tudo |
|
Palavras-Chave: |
Coffee; Parasitic fungi. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02546nam a2200181 a 4500
001 1880633
005 2011-04-14
008 2008 bl uuuu u00u1 u #d
100 1 $aRAMIRO, D. A.
245 $aEarly haustoria development in coffee (Coffea arabica) - rust (hemileia vastatrix) interaction.$h[electronic resource]
260 $aIn: INTERNATIONAL CONFERENCE ON COFFEE SCIENCE, 22. 2008, Campinas, São Paulo, Brazil.$c2008
520 $aAccording to their lifestyle, plants parasitic fungi may be classified in necrotrophs which obtain nutrients from dead cells or biotrophs which obtain nutrients from living host tissue. A common feature of the biotrophs is the formation of specialized structures called haustoria, which are responsible for uptake of nutrients from the host cells they invaded. Avirulence (Avr) genes and their respective products that are recognized by the resistance proteins inside host cells may be specifically expressed in haustoria, leading to the rapid activation of defense responses against the fungus. The objective of this study was to assess the time-course of the orange rust fungus (Hemileia vastatrix) haustoria differentiation in coffee (Coffea arabica). Histological characterization of H. vastatrix (race II) development in Tupi (immune) and Catuai (sporulation level 4) was assessed by light microscopy examination of cross sections of infected leaf fragments stained with lactophenol blue. In both interactions, careful examination of infection sites made at 600x revealed that haustorial differentiation occurred as soon as the fungus enters stomata, much earlier than previously described in the literature. Haustorium mother cell (HMC) and haustoria (termed “pioneers haustoria”) were found in the guard and adjacent cells of the stomata, before the colonization of parenchyma had occurred. In all interactions, after pioneer haustoria differentiation, the fungus displayed the usual sequence of growth stages: anchor, new HMC and haustoria development in stomatal cells and in the parenchyma. Until 36 hours after inoculation, rust development in the two cultivars did not differ. Examination of host cell death, characteristic of the hypersensitive reaction in resistant varieties, and of defense genes regulation during rust infection are currently being examined to assess the coffee resistance responses linked to pioneers haustoria formation.
653 $aCoffee
653 $aParasitic fungi
700 1 $aESCOUTE, J.
700 1 $aPETITOT, A.-S.
700 1 $aMALUF, M. P.
700 1 $aFERNANDEZ, D.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Café (CNPCa) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
| Registros recuperados : 37 | |
| 5. |  | DI FELIPPO, A.; ALUÍSIO, S. M.; OLIVEIRA, L. H. M. de; ALMEIDA, G. M. B. de. OntoMethodus - a methodology to build domain-specific ontologies and its use in a system to support the generation of terminographic products. In: WORKSHOP EM TECNOLOGIA DA INFORMAÇÃO E DA LINGUAGEM HUMANA, 6., 2008, Vila Velha, ES. Anais... Espírito Santo: Universidade Federal do Espírito Santo, 2008, p. 393-395. TIL'2008.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Agricultura Digital. |
|    |
| 13. | | SOUSA, C. da S.; SOARES, A. C. F.; GARRIDO, M. da S.; ALMEIDA, G. M. C. de O. Estreptomicetos no controle da meloidoginose em mudas de tomateiro. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 41, n. 12, p. 1759-1766, dez. 2006 Título em inglês: Streptomycetes in the control of Meloidogyne incognita in tomato plants.| Biblioteca(s): Embrapa Unidades Centrais. |
| |
| 14. | | ALMEIDA, G. M. de; COSTA, A. L. da; LIMA, F. L. de; CAMARGO, R. C. R. de. Indicadores da qualidade microbiológica em amostras de méis da região Centro Sul do Piauí. In: SIMPÓSIO DE PRODUÇÃO CIENTÍFICA, 6.; SEMINÁRIO DE INICIAÇÃO CIENTÍFICA, 4.; SEMINÁRIO DE PÓS-GRADUAÇÃO, 3., 2005, Teresina, PI. Resumos... Teresina: UESPI, 2005. p. 218.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio-Norte. |
| |
| 19. | | AMORIM, M. R.; LIMA, T. C. A.; SILVA, G. R.; ALMEIDA, G. M.; VIEIRA NETO, J. M.; LIMA, P. S. da C.; BRITTO, F. B.; DINIZ, F. M. Comparação de protocolos para extração não letal de DNA em abelhas do gênero Melipona. In: SIMPÓSIO DE PRODUÇÃO CIENTÍFICA, 7.; SEMINÁRIO DE PÓS-GRADUAÇÃO, 4.; SEMINÁRIO DE INICIAÇÃO CIENTÍFICA, 5.; SEMINÁRIO DE EXTENSÃO, 1., 2007, Teresina. Produção científica na realidade comtemporânea: anais. Teresina: UESPI-PROP, 2007. 8 p. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Meio-Norte. |
| |
| 20. | | SILVEIRA, T. C. da; LEDO, C. A. da S.; SANTOS, A. S.; TAVARES FILHO, L. F. de Q.; ALMEIDA, G. M. C. de O.; PEREIRA, V. M. Caracterização da coleção de espécies silvestres de Manihot da Embrapa Mandioca e Fruticultura utilizando descritores quantitativos e qualitativos. In: JORNADA CIENTÍFICA EMBRAPA MANDIOCA E FRUTICULTURA, 4., 2010, Cruz das Almas. [Anais...]. Cruz das Almas: Embrapa Mandioca e Fruticultura, 2010. (Embrapa Mandioca e Fruticultura. Documentos, 190). 1 CD-ROM. PDF. 064.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Mandioca e Fruticultura. |
| |
| Registros recuperados : 37 | |
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
