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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
25/04/2007 |
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Data da última atualização: |
27/04/2007 |
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Autoria: |
SOUZA, J. de; FORMENTO, N.; BOCA, T.; GODOY, C.; RIDAO, A. del C. |
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Título: |
Effect of low temperatures on the survival of Phakopsora pachyrhizi urediniosopres in overwinter volunteer soybean plants in Entre Rios Province, Argentina. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
In: NATIONAL SOYBEAN RUST SYMPOSIUM, 2006, St. Louis. Poster abstracts. [S.l.]: APS, 2006. |
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Páginas: |
p. 4. |
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Idioma: |
Inglês |
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Notas: |
Poster 3. Nome correto do quarto autor GODOY, C. V. |
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Conteúdo: |
Temperature is probably the most important of the environmental factors affecííng Phakopsora pachyrhizi survival over the winter and it has been reported that there is no spore germination below 7°C. However, erumpent uredinia of Asian soybean rust (ASR) were observed in volunteer soybean plants during the overwintering periods of the 2004-2005 and 2005-2006 growing seasons in Entre Rios province (ER). This situation may generate a new risk for Argentina. The objective of this study was to analyze the effect of low temperatures on the survival of Phakopsora pachyrhizi urediniospores under controlled conditions. Soybean leaflets with ASR and free urediniospores were exposed to temperatures between -10 and 25°C during l, 3, 5, 7, and 24 h in a controlled environment chamber. The germination rate was evaluated as an indicator of urediniospores to resist stress conditions due to frost during the overwintering period. Then, water agar plates (2%) were incubated for 6 and 22 h, and the percentage of germinated spores was assessed by counting (n = 200). Up to -10°C, gennination was observed, and a greater effect of low temperature was registered with prolonged exposure periods. If optimal conditions occurred during the 22 h after the exposure to coldness, germination was increased by approximately 50%. Low temperatures would therefore not constitute a limiting factor for P. pachyrhizi survival in ER and urediniospores may remain active on the volunteer soybean plants until the establishment of new soybean lots. Commercial cultures and volunteer soybean plants would represent the main reservoirs of the disease in ER. MenosTemperature is probably the most important of the environmental factors affecííng Phakopsora pachyrhizi survival over the winter and it has been reported that there is no spore germination below 7°C. However, erumpent uredinia of Asian soybean rust (ASR) were observed in volunteer soybean plants during the overwintering periods of the 2004-2005 and 2005-2006 growing seasons in Entre Rios province (ER). This situation may generate a new risk for Argentina. The objective of this study was to analyze the effect of low temperatures on the survival of Phakopsora pachyrhizi urediniospores under controlled conditions. Soybean leaflets with ASR and free urediniospores were exposed to temperatures between -10 and 25°C during l, 3, 5, 7, and 24 h in a controlled environment chamber. The germination rate was evaluated as an indicator of urediniospores to resist stress conditions due to frost during the overwintering period. Then, water agar plates (2%) were incubated for 6 and 22 h, and the percentage of germinated spores was assessed by counting (n = 200). Up to -10°C, gennination was observed, and a greater effect of low temperature was registered with prolonged exposure periods. If optimal conditions occurred during the 22 h after the exposure to coldness, germination was increased by approximately 50%. Low temperatures would therefore not constitute a limiting factor for P. pachyrhizi survival in ER and urediniospores may remain active on the volunteer soybean plants until the esta... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 02313naa a2200193 a 4500
001 1453484
005 2007-04-27
008 2006 bl uuuu u00u1 u #d
100 1 $aSOUZA, J. de
245 $aEffect of low temperatures on the survival of Phakopsora pachyrhizi urediniosopres in overwinter volunteer soybean plants in Entre Rios Province, Argentina.
260 $c2006
300 $ap. 4.
500 $aPoster 3. Nome correto do quarto autor GODOY, C. V.
520 $aTemperature is probably the most important of the environmental factors affecííng Phakopsora pachyrhizi survival over the winter and it has been reported that there is no spore germination below 7°C. However, erumpent uredinia of Asian soybean rust (ASR) were observed in volunteer soybean plants during the overwintering periods of the 2004-2005 and 2005-2006 growing seasons in Entre Rios province (ER). This situation may generate a new risk for Argentina. The objective of this study was to analyze the effect of low temperatures on the survival of Phakopsora pachyrhizi urediniospores under controlled conditions. Soybean leaflets with ASR and free urediniospores were exposed to temperatures between -10 and 25°C during l, 3, 5, 7, and 24 h in a controlled environment chamber. The germination rate was evaluated as an indicator of urediniospores to resist stress conditions due to frost during the overwintering period. Then, water agar plates (2%) were incubated for 6 and 22 h, and the percentage of germinated spores was assessed by counting (n = 200). Up to -10°C, gennination was observed, and a greater effect of low temperature was registered with prolonged exposure periods. If optimal conditions occurred during the 22 h after the exposure to coldness, germination was increased by approximately 50%. Low temperatures would therefore not constitute a limiting factor for P. pachyrhizi survival in ER and urediniospores may remain active on the volunteer soybean plants until the establishment of new soybean lots. Commercial cultures and volunteer soybean plants would represent the main reservoirs of the disease in ER.
700 1 $aFORMENTO, N.
700 1 $aBOCA, T.
700 1 $aGODOY, C.
700 1 $aRIDAO, A. del C.
773 $tIn: NATIONAL SOYBEAN RUST SYMPOSIUM, 2006, St. Louis. Poster abstracts. [S.l.]: APS, 2006.
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Registro original: |
Embrapa Soja (CNPSO) |
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Registro Completo
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
14/11/1997 |
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Data da última atualização: |
09/10/2008 |
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Autoria: |
SOUZA, F. H. D. de; VIEIRA, J. M. |
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Afiliação: |
EMBRAPA. Centro Nacional de Pesquisa de Gado de Corte (Campo Grande, MS). |
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Título: |
Corte e pastejo como praticas de manejo para áreas de produção de sementes de Brachiaria brizantha cv. Marandu. |
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Ano de publicação: |
1991 |
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Fonte/Imprenta: |
In : CONGRESSO BRASILEIRO DE SEMENTES, 7., 1991, Campo Grande, MS. Informativo ABRATES, Brasília, DF, v.1, n.4, p.96, 1991. Número especial. Edição dos resumos do VII Congresso Brasileiro de Sementes, Campo Grande, MS, 1991. |
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Idioma: |
Português |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00584naa a2200121 a 4500
001 1321120
005 2008-10-09
008 1991 bl uuuu u00u1 u #d
100 1 $aSOUZA, F. H. D. de
245 $aCorte e pastejo como praticas de manejo para áreas de produção de sementes de Brachiaria brizantha cv. Marandu.
260 $c1991
700 1 $aVIEIRA, J. M.
773 $tIn : CONGRESSO BRASILEIRO DE SEMENTES, 7., 1991, Campo Grande, MS. Informativo ABRATES, Brasília, DF$gv.1, n.4, p.96, 1991. Número especial. Edição dos resumos do VII Congresso Brasileiro de Sementes, Campo Grande, MS, 1991.
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