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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia; Embrapa Cerrados; Embrapa Soja. |
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Data corrente: |
15/10/1998 |
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Data da última atualização: |
15/10/1998 |
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Autoria: |
CATTELAN, A. J. |
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Título: |
Screening and characterization of soil and rhizosphere bacteria for traits that promote early soybean growth. |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
Athens, Georgia: Universidade of Georgia, 1998. |
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Páginas: |
89 f. |
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Idioma: |
Inglês |
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Notas: |
PhD. Dissertation. |
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Conteúdo: |
Understanding specifically how a particular species of bacteria is favored for growth in soybean rhizosphere will facilitate e better understanding of root colonization and competitiveness of rhizosphere organisms. This is crucial for the sucess of plant growth promoting rhizobacteria (PGPR) inoculation. We used fatty acid methyl ester (FAME) analysis to identify bacteria in two different soils and in the rhizosphere of nodulating and mon-nodulating (Glycine max (L.) Merr.) cv. 'Lee'. In a lightroom experiment, bacterial isolates from each soil and soybean rhizosphere were selected at 3, 6, and 15 days after planting. Of 1131 bacterial isolates examined, 572 (50.6%) were identified. The majority of the identified isolates were Bacillus (324 isolates), Pseudomonas (121 isolates), and Arthrobacter (48 isolates). Numbers of Bacillus spp. were lower in the rhizosphere of nodulating and non-nodulating soybean compared to root-free soil, and these lower numbers were usually offset by higher numbers of Gram-negative bacteria, especially Pseudomonas spp. From the 1131 isolates, 116 isolates were screened in vitro for a variety of PGPR traits which might increase early soybean growth. A subsample of 23 isolates, all but one of which was positive for one or more of these PGPR traits, was tested in soybean cv. 'Lee' grown in nonsterile soil. Six of eight isolates positive for 1-aminocyclopropane-1-carboxylate (ACC) deaminase production, four of sevem isolates positive for siderophore production, three of four isolates positive for B-1,3-glucanase production, and two of five isolates positive for P solubilization increased at least one aspect early soybean growth. One isolate, wich did not share any of PGPR traits tested in vitro except antagonism to S. rolfisii and S. sclerotiorum, also increased early soybean growth. All isolates that increased soybean growth, seven in total, were Pseudomonads spp. or Pseudomonas-like. One of 23 isolates increased nodule occupancy with strains of Bradyrhizobium elkanii USDA 31. Although the presence of a PGPR trait in vitro does not guarantee that a particular isolate is a PGPR, the results suggest that rhizobacteria able to produce ACC deaminase and, to a lesser extent, produce B-1,3 glucanase or siderophores or able to solubilize P in vitro, may increase early soybean growth in nosterile soil. MenosUnderstanding specifically how a particular species of bacteria is favored for growth in soybean rhizosphere will facilitate e better understanding of root colonization and competitiveness of rhizosphere organisms. This is crucial for the sucess of plant growth promoting rhizobacteria (PGPR) inoculation. We used fatty acid methyl ester (FAME) analysis to identify bacteria in two different soils and in the rhizosphere of nodulating and mon-nodulating (Glycine max (L.) Merr.) cv. 'Lee'. In a lightroom experiment, bacterial isolates from each soil and soybean rhizosphere were selected at 3, 6, and 15 days after planting. Of 1131 bacterial isolates examined, 572 (50.6%) were identified. The majority of the identified isolates were Bacillus (324 isolates), Pseudomonas (121 isolates), and Arthrobacter (48 isolates). Numbers of Bacillus spp. were lower in the rhizosphere of nodulating and non-nodulating soybean compared to root-free soil, and these lower numbers were usually offset by higher numbers of Gram-negative bacteria, especially Pseudomonas spp. From the 1131 isolates, 116 isolates were screened in vitro for a variety of PGPR traits which might increase early soybean growth. A subsample of 23 isolates, all but one of which was positive for one or more of these PGPR traits, was tested in soybean cv. 'Lee' grown in nonsterile soil. Six of eight isolates positive for 1-aminocyclopropane-1-carboxylate (ACC) deaminase production, four of sevem isolates positive for siderophore p... Mostrar Tudo |
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Palavras-Chave: |
Growth; Rhizobacterias. |
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Thesagro: |
Bactéria; Controle Biológico; Crescimento; Fixação de Nitrogênio; Fungo; Glycine Max; Nodulação; Rizosfera; Soja; Solo. |
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Thesaurus Nal: |
biological control; rhizosphere; soil; soybeans. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03217nam a2200325 a 4500
001 1558457
005 1998-10-15
008 1998 bl uuuu m 00u1 u #d
100 1 $aCATTELAN, A. J.
245 $aScreening and characterization of soil and rhizosphere bacteria for traits that promote early soybean growth.
260 $aAthens, Georgia: Universidade of Georgia$c1998
300 $a89 f.
500 $aPhD. Dissertation.
520 $aUnderstanding specifically how a particular species of bacteria is favored for growth in soybean rhizosphere will facilitate e better understanding of root colonization and competitiveness of rhizosphere organisms. This is crucial for the sucess of plant growth promoting rhizobacteria (PGPR) inoculation. We used fatty acid methyl ester (FAME) analysis to identify bacteria in two different soils and in the rhizosphere of nodulating and mon-nodulating (Glycine max (L.) Merr.) cv. 'Lee'. In a lightroom experiment, bacterial isolates from each soil and soybean rhizosphere were selected at 3, 6, and 15 days after planting. Of 1131 bacterial isolates examined, 572 (50.6%) were identified. The majority of the identified isolates were Bacillus (324 isolates), Pseudomonas (121 isolates), and Arthrobacter (48 isolates). Numbers of Bacillus spp. were lower in the rhizosphere of nodulating and non-nodulating soybean compared to root-free soil, and these lower numbers were usually offset by higher numbers of Gram-negative bacteria, especially Pseudomonas spp. From the 1131 isolates, 116 isolates were screened in vitro for a variety of PGPR traits which might increase early soybean growth. A subsample of 23 isolates, all but one of which was positive for one or more of these PGPR traits, was tested in soybean cv. 'Lee' grown in nonsterile soil. Six of eight isolates positive for 1-aminocyclopropane-1-carboxylate (ACC) deaminase production, four of sevem isolates positive for siderophore production, three of four isolates positive for B-1,3-glucanase production, and two of five isolates positive for P solubilization increased at least one aspect early soybean growth. One isolate, wich did not share any of PGPR traits tested in vitro except antagonism to S. rolfisii and S. sclerotiorum, also increased early soybean growth. All isolates that increased soybean growth, seven in total, were Pseudomonads spp. or Pseudomonas-like. One of 23 isolates increased nodule occupancy with strains of Bradyrhizobium elkanii USDA 31. Although the presence of a PGPR trait in vitro does not guarantee that a particular isolate is a PGPR, the results suggest that rhizobacteria able to produce ACC deaminase and, to a lesser extent, produce B-1,3 glucanase or siderophores or able to solubilize P in vitro, may increase early soybean growth in nosterile soil.
650 $abiological control
650 $arhizosphere
650 $asoil
650 $asoybeans
650 $aBactéria
650 $aControle Biológico
650 $aCrescimento
650 $aFixação de Nitrogênio
650 $aFungo
650 $aGlycine Max
650 $aNodulação
650 $aRizosfera
650 $aSoja
650 $aSolo
653 $aGrowth
653 $aRhizobacterias
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Registro original: |
Embrapa Cerrados (CPAC) |
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Biblioteca |
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Origem |
Tipo/Formato |
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Cutter |
Registro |
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Registro Completo
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
15/09/2008 |
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Data da última atualização: |
17/05/2022 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
GUIMARÃES, V. P.; HOLANDA JÚNIOR, E. V.; OLIVEIRA, E. L de; ALBUQUERQUE, F. H. M. A. R. de. |
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Afiliação: |
VINÍCIUS PEREIRA GUIMARÃES, consultor da Embrapa Caprinos (CNPC); EVANDRO VASCONCELOS HOLANDA JÚNIOR, CNPC; EDUARDO LUÍZ DE OLIVEIRA, CNPC; FERNANDO HENRIQUE M. A. R. DE ALBUQUERQUE, CNPC. |
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Título: |
Impact of puberty and lactation order of a dairy goat herd in Northeast of Brazil. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
In: INTERNATIONAL CONFERENCE ON GOATS, 9.; REUNIÓN NACIONAL SOBRE CAPRINOCULTURA, 23., 2008, Querétaro, México. Sustainable goat production: challenges and opportunities of small and large enterprises; proceedings. Querétaro: International Goat Association, 2008. p. 134 ref. 143. |
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Idioma: |
Inglês |
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Conteúdo: |
A dairy goat model was built to study the impacts of puberty and lactation order in a herd over time. A system dynamics approach was used to develop the feedback structure of the model, which was programmed into Vensim® . The model was developed to simulate a semi-intensive system where all parameters assumed average values reported in the production system at the Brazilian Agricultural Research Corporations (Embrapa-Goats). Although being a preliminary study, it gives very important insights of better management policies to improve the efficiency of the system by changing the profile of animals in the herd and the age of puberty by changing nutritional conditions. |
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Palavras-Chave: |
Brail; Caprino leiteiro; Gestação; Nordeste; Puberdade. |
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Thesagro: |
Lactação. |
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Thesaurus NAL: |
Dairy goats. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/48872/1/RAC-Impact-of-puberty.pdf
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Marc: |
LEADER 01584nam a2200229 a 4500
001 1527673
005 2022-05-17
008 2008 bl uuuu u00u1 u #d
100 1 $aGUIMARÃES, V. P.
245 $aImpact of puberty and lactation order of a dairy goat herd in Northeast of Brazil.$h[electronic resource]
260 $aIn: INTERNATIONAL CONFERENCE ON GOATS, 9.; REUNIÓN NACIONAL SOBRE CAPRINOCULTURA, 23., 2008, Querétaro, México. Sustainable goat production: challenges and opportunities of small and large enterprises; proceedings. Querétaro: International Goat Association, 2008. p. 134 ref. 143.$c2008
520 $aA dairy goat model was built to study the impacts of puberty and lactation order in a herd over time. A system dynamics approach was used to develop the feedback structure of the model, which was programmed into Vensim® . The model was developed to simulate a semi-intensive system where all parameters assumed average values reported in the production system at the Brazilian Agricultural Research Corporations (Embrapa-Goats). Although being a preliminary study, it gives very important insights of better management policies to improve the efficiency of the system by changing the profile of animals in the herd and the age of puberty by changing nutritional conditions.
650 $aDairy goats
650 $aLactação
653 $aBrail
653 $aCaprino leiteiro
653 $aGestação
653 $aNordeste
653 $aPuberdade
700 1 $aHOLANDA JÚNIOR, E. V.
700 1 $aOLIVEIRA, E. L de
700 1 $aALBUQUERQUE, F. H. M. A. R. de
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Embrapa Caprinos e Ovinos (CNPC) |
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