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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
04/11/1992 |
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Data da última atualização: |
04/11/1992 |
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Autoria: |
CUNNINGHAM, S.; KOLLMEYER, W. D.; STACEY, G. |
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Título: |
Chemical control of interstrain competition for soybean nodulation by Bradyrhizobium japonicum. |
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Ano de publicação: |
1991 |
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Fonte/Imprenta: |
Applied and Environmental Microbiology, v.57, n.7, p.1886-1892, 1991. |
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Idioma: |
Inglês |
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Conteúdo: |
Previous research has shown that a significant limitation to the agricultural use of improved rhizobial inoculant strains is competition from the indigenous soil population. In this work, we sought to test whether chemical inhibitors of flavonoid-induced nod gene expression in Bradyrhizobium japonicum could be identified and utilized to affect interstrain competition for nodulation of soybeans. Approximately 1,000 structural and functional analogs of the known, natural inducers of nod gene expression were tested on six strains of B. japonicum containing a nodY-lacZ fusion. We successfully identified effective inhibitors on nodY expression. The addition of the inhibitor 7-hydroxy-5-methylflavone significantly inhibited nodulation by a sensitive strain and could be used to effectively manipulate the competition between strains for soybean nodulation. However, this work also uncovered significant limitantions for the practical use of this methodology. For example, despite the almost universal induction response to the identified natural inducers, there was a wide variability among strains in their response to any specific inhibitor. Given this unexpected variability, the cost of registration of an agronomic chemical, and the potential for the development of resistant field populations, it is unlikely that chemical inhibitors can be successfully applied to a field situation. |
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Palavras-Chave: |
Competitivenes; Competitividade; Ecologia microbiana; Nod genes; Soil microbiology; Soybean. |
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Thesagro: |
Bradyrhizobium Japonicum; Glycine Max; Microbiologia; Nodulação; Soja; Solo. |
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Thesaurus Nal: |
microbial ecology. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02228naa a2200301 a 4500
001 1457520
005 1992-11-04
008 1991 bl --- 0-- u #d
100 1 $aCUNNINGHAM, S.
245 $aChemical control of interstrain competition for soybean nodulation by Bradyrhizobium japonicum.
260 $c1991
520 $aPrevious research has shown that a significant limitation to the agricultural use of improved rhizobial inoculant strains is competition from the indigenous soil population. In this work, we sought to test whether chemical inhibitors of flavonoid-induced nod gene expression in Bradyrhizobium japonicum could be identified and utilized to affect interstrain competition for nodulation of soybeans. Approximately 1,000 structural and functional analogs of the known, natural inducers of nod gene expression were tested on six strains of B. japonicum containing a nodY-lacZ fusion. We successfully identified effective inhibitors on nodY expression. The addition of the inhibitor 7-hydroxy-5-methylflavone significantly inhibited nodulation by a sensitive strain and could be used to effectively manipulate the competition between strains for soybean nodulation. However, this work also uncovered significant limitantions for the practical use of this methodology. For example, despite the almost universal induction response to the identified natural inducers, there was a wide variability among strains in their response to any specific inhibitor. Given this unexpected variability, the cost of registration of an agronomic chemical, and the potential for the development of resistant field populations, it is unlikely that chemical inhibitors can be successfully applied to a field situation.
650 $amicrobial ecology
650 $aBradyrhizobium Japonicum
650 $aGlycine Max
650 $aMicrobiologia
650 $aNodulação
650 $aSoja
650 $aSolo
653 $aCompetitivenes
653 $aCompetitividade
653 $aEcologia microbiana
653 $aNod genes
653 $aSoil microbiology
653 $aSoybean
700 1 $aKOLLMEYER, W. D.
700 1 $aSTACEY, G.
773 $tApplied and Environmental Microbiology$gv.57, n.7, p.1886-1892, 1991.
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Registro original: |
Embrapa Soja (CNPSO) |
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Registro Completo
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Biblioteca(s): |
Embrapa Acre; Embrapa Amapá; Embrapa Meio Ambiente; Embrapa Rondônia; Embrapa Roraima. |
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Data corrente: |
31/05/2021 |
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Data da última atualização: |
31/05/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
KLIMAS, C. A.; WADT, L. H. de O.; CASTILHO, C. V. de; LIRA-GUEDES, A. C.; COSTA, P. da; FONSECA, F. L. da. |
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Afiliação: |
CHRISTIE A. KLIMAS, DePaul University, Chicago, USA; LUCIA HELENA DE OLIVEIRA WADT, CPAF-RO; CAROLINA VOLKMER DE CASTILHO, CPAF-RR; ANA CLAUDIA LIRA GUEDES, CPAF-AP; PATRICIA DA COSTA, CNPMA; FERNANDA LOPES DA FONSECA, CPAF-AC. |
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Título: |
Variation in seed harvest potential of Carapa guianensis Aublet in the Brazilian Amazon: a multi-year, multi-region study of determinants of mast seeding and seed quantity. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Forests, v. 12, n. 6, 683, 2021. |
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ISSN: |
1999-4907 |
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DOI: |
https://doi.org/10.3390/f12060683 |
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Idioma: |
Inglês |
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Conteúdo: |
This work augments research on masting for the economically important tropical tree Carapa guianensis Aublet, specifically on whether determinants of mast years vary regionally, spatially, and due to longer term ENSO climate patterns. Longer term measurements (an 11-year period in Acre and Roraima; 4 years and 8 months in Amapá) from three regions of the Brazilian Amazon allowed for the analysis of whether climate cues were regionally consistent for this species. We used generalized linear mixed models, to determine which factors were significant in predicting whether trees would produce in a given year and to model the seed production quantity. We found a positive effect of increasing the diameter at breast height (dbh) on the quantity and likelihood of seed production. Our results also suggested that ecosystems and climate cues may jointly affect seed production. In flooded forests, increases in dry season rainfall had a negative impact on the likelihood of seed production whilst none of the precipitation variables investigated influenced the quantity of seeds produced. In drier terra firme forests in Acre with extended dry seasons, increases in dry season precipitation had significant and positive impacts on both the likelihood and the quantity of seed production. Our results illustrate the importance of considering plant habitat and climate to better understand individual and regional differences in seed production and their responses to inter-annual climate variation. |
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Palavras-Chave: |
Acre; Cosecha; Factores climáticos; Llanuras sujetas a inundaciones; Mainlands; Manejo florestal; Multi-use species; Producción de plántulas; Productos forestales no madereros; Produto florestal não madeireiro (PFNM); Rondônia; Roraima; Terra firme; Variação climática. |
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Thesagro: |
Andiroba; Carapa Guianensis; Colheita; Floresta Tropical; Produção de Sementes; Várzea. |
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Thesaurus NAL: |
Amazonia; Climatic factors; Floodplains; Forest management; Harvesting; Nontimber forest products; Seedling production; Tropical rain forests. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/223549/1/capfro-18565.pdf
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Marc: |
LEADER 03129naa a2200541 a 4500
001 2132107
005 2021-05-31
008 2021 bl uuuu u00u1 u #d
022 $a1999-4907
024 7 $ahttps://doi.org/10.3390/f12060683$2DOI
100 1 $aKLIMAS, C. A.
245 $aVariation in seed harvest potential of Carapa guianensis Aublet in the Brazilian Amazon$ba multi-year, multi-region study of determinants of mast seeding and seed quantity.$h[electronic resource]
260 $c2021
520 $aThis work augments research on masting for the economically important tropical tree Carapa guianensis Aublet, specifically on whether determinants of mast years vary regionally, spatially, and due to longer term ENSO climate patterns. Longer term measurements (an 11-year period in Acre and Roraima; 4 years and 8 months in Amapá) from three regions of the Brazilian Amazon allowed for the analysis of whether climate cues were regionally consistent for this species. We used generalized linear mixed models, to determine which factors were significant in predicting whether trees would produce in a given year and to model the seed production quantity. We found a positive effect of increasing the diameter at breast height (dbh) on the quantity and likelihood of seed production. Our results also suggested that ecosystems and climate cues may jointly affect seed production. In flooded forests, increases in dry season rainfall had a negative impact on the likelihood of seed production whilst none of the precipitation variables investigated influenced the quantity of seeds produced. In drier terra firme forests in Acre with extended dry seasons, increases in dry season precipitation had significant and positive impacts on both the likelihood and the quantity of seed production. Our results illustrate the importance of considering plant habitat and climate to better understand individual and regional differences in seed production and their responses to inter-annual climate variation.
650 $aAmazonia
650 $aClimatic factors
650 $aFloodplains
650 $aForest management
650 $aHarvesting
650 $aNontimber forest products
650 $aSeedling production
650 $aTropical rain forests
650 $aAndiroba
650 $aCarapa Guianensis
650 $aColheita
650 $aFloresta Tropical
650 $aProdução de Sementes
650 $aVárzea
653 $aAcre
653 $aCosecha
653 $aFactores climáticos
653 $aLlanuras sujetas a inundaciones
653 $aMainlands
653 $aManejo florestal
653 $aMulti-use species
653 $aProducción de plántulas
653 $aProductos forestales no madereros
653 $aProduto florestal não madeireiro (PFNM)
653 $aRondônia
653 $aRoraima
653 $aTerra firme
653 $aVariação climática
700 1 $aWADT, L. H. de O.
700 1 $aCASTILHO, C. V. de
700 1 $aLIRA-GUEDES, A. C.
700 1 $aCOSTA, P. da
700 1 $aFONSECA, F. L. da
773 $tForests$gv. 12, n. 6, 683, 2021.
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Embrapa Rondônia (CPAF-RO) |
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