|
|
| 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
|
|
Registro Completo
Biblioteca(s): |
Embrapa Uva e Vinho. |
Data corrente: |
05/06/2014 |
Data da última atualização: |
02/04/2019 |
Tipo da produção científica: |
Artigo de Divulgação na Mídia |
Autoria: |
CONCEIÇÃO, M. A. F. |
Afiliação: |
MARCO ANTONIO FONSECA CONCEICAO, CNPUV. |
Título: |
Como evitar perdas de água na irrigação de fruteiras. |
Ano de publicação: |
2014 |
Fonte/Imprenta: |
Jornal da Fruta, Lages, ano 22, n. 281, jun. 2014. |
Páginas: |
p. 18 |
Idioma: |
Português |
Palavras-Chave: |
Fruit. |
Thesagro: |
Agua; Conservacao da agua; Fruta; Fruticultura; Irrigacao; Recurso hidrico. |
Thesaurus NAL: |
Horticulture; Irrigation; Irrigation water; Water; Water conservation; Water management; Water resources. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/103187/1/JFrutairrigacao.jpg
|
Marc: |
LEADER 00750nam a2200277 a 4500 001 1987733 005 2019-04-02 008 2014 bl uuuu u00u1 u #d 100 1 $aCONCEIÇÃO, M. A. F. 245 $aComo evitar perdas de água na irrigação de fruteiras.$h[electronic resource] 260 $aJornal da Fruta, Lages, ano 22, n. 281, jun. 2014.$c2014 300 $ap. 18 650 $aHorticulture 650 $aIrrigation 650 $aIrrigation water 650 $aWater 650 $aWater conservation 650 $aWater management 650 $aWater resources 650 $aAgua 650 $aConservacao da agua 650 $aFruta 650 $aFruticultura 650 $aIrrigacao 650 $aRecurso hidrico 653 $aFruit
Download
Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Uva e Vinho (CNPUV) |
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
Nenhum registro encontrado para a expressão de busca informada. |
|
|