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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: |
GOMEZ-VASQUEZ, R.; DAY, R. C.; BEECHING, J. R.; COOPER, R. M. |
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Título: |
Biochemical components of disease resistance of cassava. |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
Revista Brasileira de Mandioca, Salvador, v. 17, p. 40, nov., 1998., Suplemento. |
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Idioma: |
Inglês |
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Conteúdo: |
Resistant genotypes offer the only durable, practicable means of controlling Xanthomonas bacterial bligth, but the nature of defences of cassava to this and to other diseases are virtually unknown. Suspension cultured cells in vitro show a series of resistance related responses to a range of microbial elicitors such as glucans from yeast and Colletotrichum, and to certain endogenous elicitors such as oligogalacturonides, jasmonic acid and glutathione. Surprisingly, pure LPS was ineffective but crude commercial EPS [xanthan] had effect. Auxin levels had a profound influence on intensity of cellular responses. This facile system has revealed a rapid [from 3 mins] and intensive, extracellular oxidative burst [as MO2] which can function as a first fine of defence by creating toxic Conditions, cross-linking cell wall components and as a diffusible signal. Subsequently, defence-related genes such as PAL are induced which may contribute to formation of flavonoids and antibacterial compounds. The oxidative burst may derive in part from the increased activity or production of peroxidase or from xanthine oxidase which is constitutive; gene[s] for the latter are under study. Similarly, in plants in response to incompatible bacterial pathogens, there is rapid generation of peroxide associated with plant cell walls, as revealed by cerium chloride and transmission EM; other localised increased were in peroxidase, PAL and its mRNA [revealed by in situ hybridisation], flavonoids and unknown antibacterial compounds. Catalase was down-regulated which may serve to maintain high levels of peroxide. Latex is readily released on cell damage and contains constitutuve Iysozyme but it has relatively little effect on X campestris pv. manihotis [syn. Xanonopodis]. Menos Resistant genotypes offer the only durable, practicable means of controlling Xanthomonas bacterial bligth, but the nature of defences of cassava to this and to other diseases are virtually unknown. Suspension cultured cells in vitro show a series of resistance related responses to a range of microbial elicitors such as glucans from yeast and Colletotrichum, and to certain endogenous elicitors such as oligogalacturonides, jasmonic acid and glutathione. Surprisingly, pure LPS was ineffective but crude commercial EPS [xanthan] had effect. Auxin levels had a profound influence on intensity of cellular responses. This facile system has revealed a rapid [from 3 mins] and intensive, extracellular oxidative burst [as MO2] which can function as a first fine of defence by creating toxic Conditions, cross-linking cell wall components and as a diffusible signal. Subsequently, defence-related genes such as PAL are induced which may contribute to formation of flavonoids and antibacterial compounds. The oxidative burst may derive in part from the increased activity or production of peroxidase or from xanthine oxidase which is constitutive; gene[s] for the latter are under study. Similarly, in plants in response to incompatible bacterial pathogens, there is rapid generation of peroxide associated with plant cell walls, as revealed by cerium chloride and transmission EM; other localised increased were in peroxidase, PAL and its mRNA [revealed by in situ hybridisation], flavonoids and unknow... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 02220naa a2200157 a 4500
001 1651923
005 2004-04-16
008 1998 bl uuuu u00u1 u #d
100 1 $aGOMEZ-VASQUEZ, R.
245 $aBiochemical components of disease resistance of cassava.
260 $c1998
520 $aResistant genotypes offer the only durable, practicable means of controlling Xanthomonas bacterial bligth, but the nature of defences of cassava to this and to other diseases are virtually unknown. Suspension cultured cells in vitro show a series of resistance related responses to a range of microbial elicitors such as glucans from yeast and Colletotrichum, and to certain endogenous elicitors such as oligogalacturonides, jasmonic acid and glutathione. Surprisingly, pure LPS was ineffective but crude commercial EPS [xanthan] had effect. Auxin levels had a profound influence on intensity of cellular responses. This facile system has revealed a rapid [from 3 mins] and intensive, extracellular oxidative burst [as MO2] which can function as a first fine of defence by creating toxic Conditions, cross-linking cell wall components and as a diffusible signal. Subsequently, defence-related genes such as PAL are induced which may contribute to formation of flavonoids and antibacterial compounds. The oxidative burst may derive in part from the increased activity or production of peroxidase or from xanthine oxidase which is constitutive; gene[s] for the latter are under study. Similarly, in plants in response to incompatible bacterial pathogens, there is rapid generation of peroxide associated with plant cell walls, as revealed by cerium chloride and transmission EM; other localised increased were in peroxidase, PAL and its mRNA [revealed by in situ hybridisation], flavonoids and unknown antibacterial compounds. Catalase was down-regulated which may serve to maintain high levels of peroxide. Latex is readily released on cell damage and contains constitutuve Iysozyme but it has relatively little effect on X campestris pv. manihotis [syn. Xanonopodis].
700 1 $aDAY, R. C.
700 1 $aBEECHING, J. R.
700 1 $aCOOPER, R. M.
773 $tRevista Brasileira de Mandioca, Salvador$gv. 17, p. 40, nov., 1998., Suplemento.
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Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
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Registro |
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Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
20/03/2008 |
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Data da última atualização: |
20/10/2009 |
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Tipo da produção científica: |
Documentos |
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Autoria: |
ANJOS, J. de R. N. dos; CHARCHAR, M. J. d'A. |
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Afiliação: |
José de Ribamar Nazareno dos Anjos, CPAC; Maria José d'Ávila Charchar, CPAC. |
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Título: |
Patogenicidade de isolados de fusarium sacchari de mangueira do Cerrado do Brasil Central. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Planaltina, DF: Embrapa Cerrados, 2007. |
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Páginas: |
16 p. |
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Série: |
(Embrapa Cerrados. Documentos, 180). |
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Idioma: |
Português |
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Conteúdo: |
ABSTRACT: The fungus Fusarium sacchari (E.J. Butler & Hafiz Kahn) W. Gams, was consistently isolated from infected malformed shoots and panicles of mango in the Cerrado Region of Central Brazil, from 1998 to 2000. Pathogenicity tests of the F. sacchari isolates were carried out on potted six month-old Tommy Atkins seedlings by introducting a PDA disk with fungal mycelium and conidia in a vertical slit at the tip. F. sacchari is almost completely restricted to shoot tissues in malformed trees. The levels of colonization are highest in malformed vegetative and floral shoots and are much lower in asymptomatic shoots. Treatment of mango malformation with fungicides is ineffective. The only viable control option is the removal and burning of the affected shoot tissue. |
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Palavras-Chave: |
Control; Controle; Fusarium sacchari; Plant diseases. |
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Thesagro: |
Doença de Planta; Doença Fúngica; Fungo; Malformação; Manga; Mangifera Indica; Patogenicidade. |
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Thesaurus NAL: |
fungi; mangoes; pathogenicity. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CPAC-2009/28635/1/doc_180.pdf
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Marc: |
LEADER 01620nam a2200313 a 4500
001 1571975
005 2009-10-20
008 2007 bl uuuu u0uu1 u #d
100 1 $aANJOS, J. de R. N. dos
245 $aPatogenicidade de isolados de fusarium sacchari de mangueira do Cerrado do Brasil Central.
260 $aPlanaltina, DF: Embrapa Cerrados$c2007
300 $a16 p.
490 $a(Embrapa Cerrados. Documentos, 180).
520 $aABSTRACT: The fungus Fusarium sacchari (E.J. Butler & Hafiz Kahn) W. Gams, was consistently isolated from infected malformed shoots and panicles of mango in the Cerrado Region of Central Brazil, from 1998 to 2000. Pathogenicity tests of the F. sacchari isolates were carried out on potted six month-old Tommy Atkins seedlings by introducting a PDA disk with fungal mycelium and conidia in a vertical slit at the tip. F. sacchari is almost completely restricted to shoot tissues in malformed trees. The levels of colonization are highest in malformed vegetative and floral shoots and are much lower in asymptomatic shoots. Treatment of mango malformation with fungicides is ineffective. The only viable control option is the removal and burning of the affected shoot tissue.
650 $afungi
650 $amangoes
650 $apathogenicity
650 $aDoença de Planta
650 $aDoença Fúngica
650 $aFungo
650 $aMalformação
650 $aManga
650 $aMangifera Indica
650 $aPatogenicidade
653 $aControl
653 $aControle
653 $aFusarium sacchari
653 $aPlant diseases
700 1 $aCHARCHAR, M. J. d'A.
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Embrapa Cerrados (CPAC) |
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