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Registro Completo |
Biblioteca(s): |
Embrapa Unidades Centrais. |
Data corrente: |
27/11/2008 |
Data da última atualização: |
02/08/2019 |
Autoria: |
SILVA, E. P. da; CUNHA, G. R. da; PIRES, J. L. F. |
Afiliação: |
Eunice Portela da Silva, Universidade de Passo Fundo; GILBERTO ROCCA DA CUNHA, CNPT; JOAO LEONARDO FERNANDES PIRES, CNPT. |
Título: |
Fatores abióticos envolvidos na tolerância de trigo à geada. |
Ano de publicação: |
2008 |
Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 43, n. 10, p. 1257-1265, out. 2008. |
Idioma: |
Português |
Notas: |
Título em inglês: Abiotic factors involved in wheat tolerance to frost. |
Conteúdo: |
O objetivo deste trabalho foi avaliar a influência da aclimatação, da intensidade de geada e da disponibilidade hídrica sobre os danos causados pela geada em trigo. Os experimentos foram conduzidos em telados, com trigo cultivado em vasos. A aclimatação e a incidência de geada foram simuladas em câmaras de crescimento. Os fatores abióticos avaliados foram: regimes de aclimatação (com e sem); gradiente de temperatura (2, -2, -4 e -7°C); e variação de disponibilidade hídrica no solo, antes da geada (9, 6, 3 e 1 dia sem irrigação). Todos os fatores foram avaliados no afilhamento, alongamento e espigamento das cultivares: BR-18 Terena, mais tolerante à geada; e BRS 194, menos tolerante. As variáveis avaliadas foram: grau de queima de folhas, sete dias após a geada; massa de matéria seca total; e massa de grãos. A aclimatação do trigo, antes da geada, diminuiu os danos provocados antes do espigamento, e resultou em menor queima de folhas e maior rendimento de grãos. A temperatura de -7°C, no espigamento, resultou em falha na produção de grãos de ambas as cultivares; e os prejuízos com geada foram menores nas plantas com nove dias sem irrigação. As condições anteriores à ocorrência de geada têm influência sobre os danos provocados por ela. |
Palavras-Chave: |
acclimatization; deficit hídrico; estádio fenológico; growth stage; water deficit. |
Thesagro: |
Aclimatação; Congelamento; Triticum Aestivum. |
Thesaurus Nal: |
freezing. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE-2009-09/44965/1/43n10a02.pdf
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Marc: |
LEADER 02101naa a2200265 a 4500 001 1122161 005 2019-08-02 008 2008 bl uuuu u00u1 u #d 100 1 $aSILVA, E. P. da 245 $aFatores abióticos envolvidos na tolerância de trigo à geada. 260 $c2008 500 $aTítulo em inglês: Abiotic factors involved in wheat tolerance to frost. 520 $aO objetivo deste trabalho foi avaliar a influência da aclimatação, da intensidade de geada e da disponibilidade hídrica sobre os danos causados pela geada em trigo. Os experimentos foram conduzidos em telados, com trigo cultivado em vasos. A aclimatação e a incidência de geada foram simuladas em câmaras de crescimento. Os fatores abióticos avaliados foram: regimes de aclimatação (com e sem); gradiente de temperatura (2, -2, -4 e -7°C); e variação de disponibilidade hídrica no solo, antes da geada (9, 6, 3 e 1 dia sem irrigação). Todos os fatores foram avaliados no afilhamento, alongamento e espigamento das cultivares: BR-18 Terena, mais tolerante à geada; e BRS 194, menos tolerante. As variáveis avaliadas foram: grau de queima de folhas, sete dias após a geada; massa de matéria seca total; e massa de grãos. A aclimatação do trigo, antes da geada, diminuiu os danos provocados antes do espigamento, e resultou em menor queima de folhas e maior rendimento de grãos. A temperatura de -7°C, no espigamento, resultou em falha na produção de grãos de ambas as cultivares; e os prejuízos com geada foram menores nas plantas com nove dias sem irrigação. As condições anteriores à ocorrência de geada têm influência sobre os danos provocados por ela. 650 $afreezing 650 $aAclimatação 650 $aCongelamento 650 $aTriticum Aestivum 653 $aacclimatization 653 $adeficit hídrico 653 $aestádio fenológico 653 $agrowth stage 653 $awater deficit 700 1 $aCUNHA, G. R. da 700 1 $aPIRES, J. L. F. 773 $tPesquisa Agropecuária Brasileira, Brasília, DF$gv. 43, n. 10, p. 1257-1265, out. 2008.
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Embrapa Unidades Centrais (AI-SEDE) |
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Registro Completo
Biblioteca(s): |
Embrapa Milho e Sorgo. |
Data corrente: |
15/04/2008 |
Data da última atualização: |
24/05/2018 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
Internacional - A |
Autoria: |
BRESSAN, W.; FIGUEIREDO, J. E. F. |
Afiliação: |
WELLINGTON BRESSAN, CNPMS; JOSE EDSON FONTES FIGUEIREDO, CNPMS. |
Título: |
Efficacy and dose-response relationship in biocontrol of fusarium disease in maize by Streptomyces spp. |
Ano de publicação: |
2008 |
Fonte/Imprenta: |
European Journal of Plant Pathology, Dordrecht, v. 120, n. 3, p. 311-316, 2008. |
DOI: |
10.1007/s10658-007-9220-y |
Idioma: |
Inglês |
Conteúdo: |
Two isolates of Streptomyces spp. DAUFPE 11470 and DAUFPE 14632 were evaluated to determine the antagonist pathogen inoculum concentration relationship under greenhouse conditions. Pathogen and antagonist concentration, significantly (P?0.05) affected development of Fusarium disease in maize with a significant interaction between pathogen and antagonist concentration. Dose response relationship also differed significantly (P?0.05) between the two isolates, but both isolates demonstrated effective control of Fusarium disease, regardless of pathogen concentration. The isolate DAUFPE 11470 provided the most effective control. The lowest value for disease incidence occurred at low pathogen (103 chlamydospore g-1 soil) and high antagonist concentration (106 cfu ml-1) for both isolates. The disease incidence for control plants ranged from 19% to 76%. However, in relation to control the lowest disease reduction occurred at low pathogen (103 chlamydospore g-1 soil) and high antagonist concentrations (106 cfu ml-1). These reductions were 10.6% and 13% for DAUFPE 14632 and DAUFPE 11470, respectively. The highest disease reductions, in relation to control plants, occurred at high pathogen (106 chlamydospore g-1 soil) and antagonist (106 cfu ml-1) concentrations for both isolates. These values were 55% and 62.2% for DAUFPE 14632 and DAUFPE 11470, respectively. The chlamydospore germination of Fusarium moniliforme was affected by glucose addition, antagonist isolates and type of inoculum. The lowest chlamydospore germination was observed with bacterial suspensions of the isolates, for all glucose additions. The results suggested that both Streptomyces spp. isolates were effective at different doses as biocontrol agents against F. moniliforme. Also, there was evidence for at least two mechanisms of biocontrol and that apparently, both isolates showed the same mechanisms of biocontrol action related to production of bioactive compounds and competition for carbon. Further studies will be developed to improve the level and effectiveness of control by these isolates. MenosTwo isolates of Streptomyces spp. DAUFPE 11470 and DAUFPE 14632 were evaluated to determine the antagonist pathogen inoculum concentration relationship under greenhouse conditions. Pathogen and antagonist concentration, significantly (P?0.05) affected development of Fusarium disease in maize with a significant interaction between pathogen and antagonist concentration. Dose response relationship also differed significantly (P?0.05) between the two isolates, but both isolates demonstrated effective control of Fusarium disease, regardless of pathogen concentration. The isolate DAUFPE 11470 provided the most effective control. The lowest value for disease incidence occurred at low pathogen (103 chlamydospore g-1 soil) and high antagonist concentration (106 cfu ml-1) for both isolates. The disease incidence for control plants ranged from 19% to 76%. However, in relation to control the lowest disease reduction occurred at low pathogen (103 chlamydospore g-1 soil) and high antagonist concentrations (106 cfu ml-1). These reductions were 10.6% and 13% for DAUFPE 14632 and DAUFPE 11470, respectively. The highest disease reductions, in relation to control plants, occurred at high pathogen (106 chlamydospore g-1 soil) and antagonist (106 cfu ml-1) concentrations for both isolates. These values were 55% and 62.2% for DAUFPE 14632 and DAUFPE 11470, respectively. The chlamydospore germination of Fusarium moniliforme was affected by glucose addition, antagonist isolates and type of inoc... Mostrar Tudo |
Palavras-Chave: |
Maize; Seedborne diseases. |
Thesagro: |
Fusarium Moniliforme; Milho. |
Thesaurus NAL: |
Streptomyces. |
Categoria do assunto: |
H Saúde e Patologia |
Marc: |
LEADER 02749naa a2200205 a 4500 001 1484608 005 2018-05-24 008 2008 bl uuuu u00u1 u #d 024 7 $a10.1007/s10658-007-9220-y$2DOI 100 1 $aBRESSAN, W. 245 $aEfficacy and dose-response relationship in biocontrol of fusarium disease in maize by Streptomyces spp.$h[electronic resource] 260 $c2008 520 $aTwo isolates of Streptomyces spp. DAUFPE 11470 and DAUFPE 14632 were evaluated to determine the antagonist pathogen inoculum concentration relationship under greenhouse conditions. Pathogen and antagonist concentration, significantly (P?<?0.05) affected development of Fusarium disease in maize with a significant interaction between pathogen and antagonist concentration. Dose response relationship also differed significantly (P?<?0.05) between the two isolates, but both isolates demonstrated effective control of Fusarium disease, regardless of pathogen concentration. The isolate DAUFPE 11470 provided the most effective control. The lowest value for disease incidence occurred at low pathogen (103 chlamydospore g-1 soil) and high antagonist concentration (106 cfu ml-1) for both isolates. The disease incidence for control plants ranged from 19% to 76%. However, in relation to control the lowest disease reduction occurred at low pathogen (103 chlamydospore g-1 soil) and high antagonist concentrations (106 cfu ml-1). These reductions were 10.6% and 13% for DAUFPE 14632 and DAUFPE 11470, respectively. The highest disease reductions, in relation to control plants, occurred at high pathogen (106 chlamydospore g-1 soil) and antagonist (106 cfu ml-1) concentrations for both isolates. These values were 55% and 62.2% for DAUFPE 14632 and DAUFPE 11470, respectively. The chlamydospore germination of Fusarium moniliforme was affected by glucose addition, antagonist isolates and type of inoculum. The lowest chlamydospore germination was observed with bacterial suspensions of the isolates, for all glucose additions. The results suggested that both Streptomyces spp. isolates were effective at different doses as biocontrol agents against F. moniliforme. Also, there was evidence for at least two mechanisms of biocontrol and that apparently, both isolates showed the same mechanisms of biocontrol action related to production of bioactive compounds and competition for carbon. Further studies will be developed to improve the level and effectiveness of control by these isolates. 650 $aStreptomyces 650 $aFusarium Moniliforme 650 $aMilho 653 $aMaize 653 $aSeedborne diseases 700 1 $aFIGUEIREDO, J. E. F. 773 $tEuropean Journal of Plant Pathology, Dordrecht$gv. 120, n. 3, p. 311-316, 2008.
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