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![](/consulta/web/img/deny.png) | Acesso ao texto completo restrito à biblioteca da Embrapa Arroz e Feijão. Para informações adicionais entre em contato com cnpaf.biblioteca@embrapa.br. |
Registro Completo |
Biblioteca(s): |
Embrapa Arroz e Feijão. |
Data corrente: |
28/11/1994 |
Data da última atualização: |
26/10/2021 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
MAGALHÃES, B. P.; WAYNE, R.; HUMBER, R. A.; SHIELDS, E. J.; ROBERTS, D. W. |
Afiliação: |
BONIFACIO PEIXOTO MAGALHAES, CNPAF. |
Título: |
Calcium-regulated appressorium formation of the entomopathogenic fungus Zoophthora radicans. |
Ano de publicação: |
1991 |
Fonte/Imprenta: |
Protoplasma, v. 160, p. 77-88, June 1991. |
DOI: |
https://doi.org/10.1007/BF01539959 |
Idioma: |
Inglês |
Conteúdo: |
The fungus Zoophthora radicans (Zygomycetes: Entomophthorales) requires external Ca2+ for appressorium formation but not for conidial germination. The number of appressoria formed depends on the Ca2+ concentration of the medium. At low [Ca2+] (100 pM) nuclear division and germ tube growth are significantly reduced compared to higher Ca2+ concentrations (10 and 1,000 uM). By contrast, neither external K+ nor external Cl- is needed for germination or appressorium formation. Treatment of conidia with a Ca2+-antagonist, Nd3+, and a Ca2+-channel blocker, nifedipine, inhibits appressorium formation, showing that a Ca2+ influx is required for appressorium formation. Furthermore, the partial yet saturating inhibition by nifedipine and complete inhibition by Nd3+ indicates that at least two kinds of Ca2+ channels are involved in appressorium formation. A contribution of intracellular Ca2+ to the signal transduction chain for the formation of appressoria is demonstrated by the inhibitory effect of the intracellular Ca2+ antagonist TMB-8. The calmodulin antagonists R24571, TFP, W-7, and W-5 inhibit appressorium formation at concentrations which have no effect on germination. The data presented in this paper are consistent with the hypothesis that a Ca2+/calmodulin system is involved in regulating appressorium formation. However, since the direct effects of the drugs were not specifically tested on their proposed binding sites, we leave room for alternative hypotheses that have yet to be formulated. MenosThe fungus Zoophthora radicans (Zygomycetes: Entomophthorales) requires external Ca2+ for appressorium formation but not for conidial germination. The number of appressoria formed depends on the Ca2+ concentration of the medium. At low [Ca2+] (100 pM) nuclear division and germ tube growth are significantly reduced compared to higher Ca2+ concentrations (10 and 1,000 uM). By contrast, neither external K+ nor external Cl- is needed for germination or appressorium formation. Treatment of conidia with a Ca2+-antagonist, Nd3+, and a Ca2+-channel blocker, nifedipine, inhibits appressorium formation, showing that a Ca2+ influx is required for appressorium formation. Furthermore, the partial yet saturating inhibition by nifedipine and complete inhibition by Nd3+ indicates that at least two kinds of Ca2+ channels are involved in appressorium formation. A contribution of intracellular Ca2+ to the signal transduction chain for the formation of appressoria is demonstrated by the inhibitory effect of the intracellular Ca2+ antagonist TMB-8. The calmodulin antagonists R24571, TFP, W-7, and W-5 inhibit appressorium formation at concentrations which have no effect on germination. The data presented in this paper are consistent with the hypothesis that a Ca2+/calmodulin system is involved in regulating appressorium formation. However, since the direct effects of the drugs were not specifically tested on their proposed binding sites, we leave room for alternative hypotheses that have yet to b... Mostrar Tudo |
Palavras-Chave: |
Appressorium formation; Entomopathogen. |
Thesagro: |
Fungo; Fungo Entomógeno; Zoophthora Radicans. |
Thesaurus Nal: |
Calcium; Calmodulin; Entomopathogenic fungi. |
Categoria do assunto: |
O Insetos e Entomologia |
Marc: |
LEADER 02322naa a2200277 a 4500 001 1198109 005 2021-10-26 008 1991 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.1007/BF01539959$2DOI 100 1 $aMAGALHÃES, B. P. 245 $aCalcium-regulated appressorium formation of the entomopathogenic fungus Zoophthora radicans.$h[electronic resource] 260 $c1991 520 $aThe fungus Zoophthora radicans (Zygomycetes: Entomophthorales) requires external Ca2+ for appressorium formation but not for conidial germination. The number of appressoria formed depends on the Ca2+ concentration of the medium. At low [Ca2+] (100 pM) nuclear division and germ tube growth are significantly reduced compared to higher Ca2+ concentrations (10 and 1,000 uM). By contrast, neither external K+ nor external Cl- is needed for germination or appressorium formation. Treatment of conidia with a Ca2+-antagonist, Nd3+, and a Ca2+-channel blocker, nifedipine, inhibits appressorium formation, showing that a Ca2+ influx is required for appressorium formation. Furthermore, the partial yet saturating inhibition by nifedipine and complete inhibition by Nd3+ indicates that at least two kinds of Ca2+ channels are involved in appressorium formation. A contribution of intracellular Ca2+ to the signal transduction chain for the formation of appressoria is demonstrated by the inhibitory effect of the intracellular Ca2+ antagonist TMB-8. The calmodulin antagonists R24571, TFP, W-7, and W-5 inhibit appressorium formation at concentrations which have no effect on germination. The data presented in this paper are consistent with the hypothesis that a Ca2+/calmodulin system is involved in regulating appressorium formation. However, since the direct effects of the drugs were not specifically tested on their proposed binding sites, we leave room for alternative hypotheses that have yet to be formulated. 650 $aCalcium 650 $aCalmodulin 650 $aEntomopathogenic fungi 650 $aFungo 650 $aFungo Entomógeno 650 $aZoophthora Radicans 653 $aAppressorium formation 653 $aEntomopathogen 700 1 $aWAYNE, R. 700 1 $aHUMBER, R. A. 700 1 $aSHIELDS, E. J. 700 1 $aROBERTS, D. W. 773 $tProtoplasma$gv. 160, p. 77-88, June 1991.
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1. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | HUMBER, R. A.; TIGANO, M. S. Global perspectives on the discovery, isolation, preservation, and exploitation of entomopathogenic fungal germplasm. In: INTERNATIONAL COLLOQUIUM ON INVERTEBRATE PATHOLOGY AND MICROBIAL CONTROL, 8.; INTERNATIONAL CONFERENCE ON BACILLUS THURINGIENSIS 6.; ANNUAL MEETING OF THE SIP, 35., 2002, Foz do Iguassu. Proceedings... Londrina: Embrapa Soja: Embrapa Recursos Genéticos e Biotecnologia: UEL: SIP, 2002. p. 196-200. (Embrapa Soja. Documentos, 184; Embrapa Recursos Genéticos e Biotecnologia, 74). Symposium (Cross-Division 2) Microbial Germplasm Repositories: the legacy, problem, the future.Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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2. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | SOSA-GOMEZ, D.R.; HUMBER, R. A.; MOSCARDI, F. Entomopathogens associated with soybean/wheat production systems in Brazil and Argentina. In: INTERNATIONAL COLLOQUIUM ON INVERTEBRATE PATHOLOGY AND MICROBIAL CONTROL, 8.; INTERNATIONAL CONFERENCE ON BACILLUS THURINGIENSIS 6.; ANNUAL MEETING OF THE SIP, 35., 2002, Foz do Iguassu. Program and abstracts. Londrina: Embrapa Soja: Embrapa Recursos Genéticos e Biotecnologia: UEL: SIP, 2002. p. 75. (Embrapa Soja. Documentos, 183; Embrapa Recursos Genéticos e Biotecnologia, 73).Biblioteca(s): Embrapa Soja. |
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9. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | MAGALHAES, B. P.; WAYNE, R.; HUMBER, R. A.; SHIELDS, E. J.; ROBERTS, D. W. Papel do calcio na formacao de apressorio pelo fungo entomopatogenico Zoophthora radicans. In: SIMPOSIO DE CONTROLE BIOLOGICO, 2., 1990, Brasilia. Resumos... Brasilia: EMBRAPA-CENARGEN, 1990. p.123-124. (EMBRAPA-CENARGEN. Documentos, 13).Biblioteca(s): Embrapa Arroz e Feijão. |
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12. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | D'ALESSANDRO, C. P.; JONES, L. R.; HUMBER, R. A.; LÓPEZ LASTRA, C. C.; SOSA-GOMEZ, D. R. Characterization and phylogeny of Isaria spp. strains (Ascomycota: Hypocreales) using ITS1-5.8S-ITS2 and elongation factor 1-alpha sequences. Journal of Basic Microbiology, Weinheim, v. 53, n. 12, p. 1-11, Nov. 2013.Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 1 |
Biblioteca(s): Embrapa Soja. |
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13. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | MARTINEZ, J. M.; RODRIGUES, J.; MARRETO, R. N.; MASCARIN, G. M.; FERNANDES, E. K. K.; HUMBER, R. A.; LUZ, C. Efficacy of focal applications of a mycoinsecticide to control Aedes aegypti in Central Brazil. Applied Microbiology and Biotechnology, v. 105, n. 23, p. 8702-8714, 2021.Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
Biblioteca(s): Embrapa Meio Ambiente. |
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14. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | MAGALHÃES, B. P.; ST. LEGER, R. J.; HUMBER, R. A.; ALLEE, L. L.; SHIELDS, E. J.; ROBERTS, D. W. Nuclear events during germination and appressorial formation of the entomopathogenic fungus Zoophthora radicans (Zygomycetes: entomophthorales). Journal of Invertebrate Pathology, New York, v. 57, n. 1, p. 43-49, Jan. 1991.Biblioteca(s): Embrapa Arroz e Feijão. |
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15. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | MONTALVA, C.; COLLIER, K.; ROCHA, L. F. N.; INGLIS, P. W.; LOPES, R. B.; LUZ, C.; HUMBER, R. A. A natural fungal infection of a sylvatic cockroach with Metarhizium blattodeae sp. nov., a member of the M. flavoviride species complex. Fungal Biology, v. 120, n. 5, p. 655-665, 2016.Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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16. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | LOPES, R. B.; SOUZA, D. A. de; ROCHA, L. F. N.; MONTALVA, C.; LUZ, C.; HUMBER, R. A.; FARIA, M. Metarhizium alvesii sp. nov.: a new member of the Metarhizium anisopliae species complex. Journal of Invertebrate Pathology, v. 151, p. 165-168, 2018.Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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17. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | SOSA-GOMEZ, D. R.; HUMBER, R. A.; HODGE, K. T.; BINNECK, E.; SILVA-BRANDÃO, K. L. da. Variability of the mitochondrial SSU rDNA of Nomuraea species and other entomopathogenic fungi from Hypocreales. Mycopathologia, Netherlands, v. 167, n. 3, p. 145-154, mar. 2009.Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 3 |
Biblioteca(s): Embrapa Soja. |
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19. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | CATÃO, A. M. L.; RODRIGUES, J.; MARRETO, R. N.; MASCARIN, G. M.; FERNANDES, E. K. K.; HUMBER, R. A.; LUZ, C. Optimization of granular formulations of Metarhizium humberi microsclerotia with humectants. Journal of Basic Microbiology, v. 61, n. 9, p. 808-813, 2021.Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 1 |
Biblioteca(s): Embrapa Meio Ambiente. |
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20. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | MASCARIN, G. M.; GUARÍN-MOLINA, J. H.; ARTHURS, S. P.; HUMBER, R. A.; MORAL, R. de A.; DEMÉTRIO, C. G. B.; DELALIBERA JUNIOR, I. Seasonal prevalence of the insect pathogenic fungus Colletotrichum nymphaeae in Brazilian citrus groves under different chemical pesticide regimes. Fungal Ecology, v. 22, p. 43-51, Aug. 2016.Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
Biblioteca(s): Embrapa Arroz e Feijão. |
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Registros recuperados : 22 | |
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Nenhum registro encontrado para a expressão de busca informada. |
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