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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
01/12/1997 |
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Data da última atualização: |
01/12/1997 |
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Autoria: |
COSTA LIMA, M. A.; VILAR, C. V.; REIS, V. M.; OLIVARES, F. L.; BALDANI, J. I.; FERREIRA, P. C. G.; HEMERLY, A. S. |
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Título: |
Detection of sugarcane (Saccharum officinarum L.) genes induced by endophytic nitrogen-fixing bacteria. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
In: REUNIAO ANUAL DA SOCIEDADE BRASILEIRA DE BIOQUIMICA E BIOLOGIA MOLECULAR, 25., maio 1996, Caxambu. Resumos... Caxambu: Sociedade Brasileira de Bioquimica e Biologia Molecular, 1996. p.42. Resumo E-74. |
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Idioma: |
Inglês |
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Conteúdo: |
Nitrogen is an essential element for all living organisms,beig used for protcin and nucleic acids biosynthesis. it is assimilated by plants and animals as ammoniom(NH4) or nitrate (NO3).atmospheric nitrogen(N2)despite its abundance, cannot be utilized directly.biologic nitrogen fixation (BNF) is the process by wich atmosphcric nitrogen becone available and consiste basically in nitrogen reduction,in process caralyzed by enzymes. only a few species of bacteria and algae are able to do this process. endophytic nitrongen-fixing bacteria as acetobacter and herbaspirillum were foud in sugarcane tissues.in this symbiotic association, BNF occurs withont induction of nodule formation, in a system that differs from rhizobium-leguminoscre interaction. in this system, litle is known about plant-bacteria interaction of BNF in distinc sugarcane genotypes indicates that plant genetic factors are contributing to the efficiency of the process. the isolation and characterization of plant genes induced during the processes of recognition, colonization and nitrogen fixation by the bacteria wil provid tools for future genetic manipulation to obtain high rales of BNF. In order to study the role of the plant in this new system of symbiotic association we have useda modification of the differential disply technique to detect and isolate cDNAs corresponding to transcripts expressed in sugarcane plants infected wit Acetobacter diazotrophichs and Herbaspirillum spp..plants were propagated and infected in vitro. In a preliminary screenig, eight different random primers were selected to amplify cDNAs present only in infected plants. The differentially expressed bands obtained were eletud and reaplifiend using the same primers. Southern blot hybridizations using total cDNA-obtained from infected plants as probe are beig performed to confim differential expression. The induced genes will be cloned and further characterized. MenosNitrogen is an essential element for all living organisms,beig used for protcin and nucleic acids biosynthesis. it is assimilated by plants and animals as ammoniom(NH4) or nitrate (NO3).atmospheric nitrogen(N2)despite its abundance, cannot be utilized directly.biologic nitrogen fixation (BNF) is the process by wich atmosphcric nitrogen becone available and consiste basically in nitrogen reduction,in process caralyzed by enzymes. only a few species of bacteria and algae are able to do this process. endophytic nitrongen-fixing bacteria as acetobacter and herbaspirillum were foud in sugarcane tissues.in this symbiotic association, BNF occurs withont induction of nodule formation, in a system that differs from rhizobium-leguminoscre interaction. in this system, litle is known about plant-bacteria interaction of BNF in distinc sugarcane genotypes indicates that plant genetic factors are contributing to the efficiency of the process. the isolation and characterization of plant genes induced during the processes of recognition, colonization and nitrogen fixation by the bacteria wil provid tools for future genetic manipulation to obtain high rales of BNF. In order to study the role of the plant in this new system of symbiotic association we have useda modification of the differential disply technique to detect and isolate cDNAs corresponding to transcripts expressed in sugarcane plants infected wit Acetobacter diazotrophichs and Herbaspirillum spp..plants were propagated and infecte... Mostrar Tudo |
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Palavras-Chave: |
BNF; FBN; Fixacao biologica de nitrogenio; Nitrogen fixing bacteria; Sugar cane. |
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Thesagro: |
Bactéria; Cana de Açúcar; Parasito de Planta; Saccharum Officinarum. |
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Thesaurus Nal: |
endophytes. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02964naa a2200313 a 4500
001 1620946
005 1997-12-01
008 1996 bl uuuu u00u1 u #d
100 1 $aCOSTA LIMA, M. A.
245 $aDetection of sugarcane (Saccharum officinarum L.) genes induced by endophytic nitrogen-fixing bacteria.
260 $c1996
520 $aNitrogen is an essential element for all living organisms,beig used for protcin and nucleic acids biosynthesis. it is assimilated by plants and animals as ammoniom(NH4) or nitrate (NO3).atmospheric nitrogen(N2)despite its abundance, cannot be utilized directly.biologic nitrogen fixation (BNF) is the process by wich atmosphcric nitrogen becone available and consiste basically in nitrogen reduction,in process caralyzed by enzymes. only a few species of bacteria and algae are able to do this process. endophytic nitrongen-fixing bacteria as acetobacter and herbaspirillum were foud in sugarcane tissues.in this symbiotic association, BNF occurs withont induction of nodule formation, in a system that differs from rhizobium-leguminoscre interaction. in this system, litle is known about plant-bacteria interaction of BNF in distinc sugarcane genotypes indicates that plant genetic factors are contributing to the efficiency of the process. the isolation and characterization of plant genes induced during the processes of recognition, colonization and nitrogen fixation by the bacteria wil provid tools for future genetic manipulation to obtain high rales of BNF. In order to study the role of the plant in this new system of symbiotic association we have useda modification of the differential disply technique to detect and isolate cDNAs corresponding to transcripts expressed in sugarcane plants infected wit Acetobacter diazotrophichs and Herbaspirillum spp..plants were propagated and infected in vitro. In a preliminary screenig, eight different random primers were selected to amplify cDNAs present only in infected plants. The differentially expressed bands obtained were eletud and reaplifiend using the same primers. Southern blot hybridizations using total cDNA-obtained from infected plants as probe are beig performed to confim differential expression. The induced genes will be cloned and further characterized.
650 $aendophytes
650 $aBactéria
650 $aCana de Açúcar
650 $aParasito de Planta
650 $aSaccharum Officinarum
653 $aBNF
653 $aFBN
653 $aFixacao biologica de nitrogenio
653 $aNitrogen fixing bacteria
653 $aSugar cane
700 1 $aVILAR, C. V.
700 1 $aREIS, V. M.
700 1 $aOLIVARES, F. L.
700 1 $aBALDANI, J. I.
700 1 $aFERREIRA, P. C. G.
700 1 $aHEMERLY, A. S.
773 $tIn: REUNIAO ANUAL DA SOCIEDADE BRASILEIRA DE BIOQUIMICA E BIOLOGIA MOLECULAR, 25., maio 1996, Caxambu. Resumos... Caxambu: Sociedade Brasileira de Bioquimica e Biologia Molecular, 1996. p.42. Resumo E-74.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Leite. Para informações adicionais entre em contato com cnpgl.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
18/08/2021 |
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Data da última atualização: |
19/08/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
PEREZ, V. K. C.; CUSTODIO, D. A. C.; SILVA, E. M. M.; OLIVEIRA, J. de; GUIMARÃES, A. S.; BRITO, M. A. V. P.; SOUZA-FILHO, A. F.; HEINEMANN, M. B.; LAGE, A. P.; DORNELES, E. M. S. |
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Afiliação: |
VERÓNICA K. C. PÉREZ, Universidade Federal de Lavras, Lavras; DIRCÉIA A. C. CUSTÓDIO, Universidade Federal de Lavras; EDUARDA M. M. SILVA, Universidade Federal de Lavras; JULIA DE OLIVEIRA, Universidade Federal de Lavras; ALESSANDRO DE SA GUIMARAES, CNPGL; MARIA A. V. P. BRITO; ANTÔNIO F. SOUZA-FILHO, Universidade de São Paulo; MARCOS B. HEINEMANN, Universidade de São Paulo; ANDREY P. LAGE, Universidade Federal de Minas Gerais; ELAINE M. S. DORNELES, Universidade Federal de Lavras. |
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Título: |
Virulence factors and antimicrobial resistance in Staphylococcus aureus isolated from bovine mastitis in Brazil. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Brazilian Journal of Microbiology, v. 51, p. 2111-2122, 2020. |
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DOI: |
https://doi.org/10.1007/s42770-020-00363-5 |
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Idioma: |
Inglês |
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Conteúdo: |
This study aimed to evaluate virulence factors and genetic markers of antimicrobial resistance in 400 Staphylococcus aureus strains isolated from bovine mastitis in four Brazilian states, as well as to assess the association between these characteristics and field information. Virulence factors and drug resistance genes were identified by PCR screening. Biofilm-forming and hemolytic phenotype were detected using Congo red Tryptic Soy Broth and defibrinated sheep blood agar, respectively. Of all isolates, 83.5% were biofilm-forming and 98.5% strains exhibited biofilm gene icaAD, and a significant association between phenotype and genotype for biofilm was observed (P = 0.0005). Hemolysin genes were observed in 82.85% (hla+hlb+), 16.5% (hla+) and 0.75% (hlb+) isolates, whereas the hemolytic phenotype exhibited was complete and incomplete hemolysis in 64.25%, complete in 28.25%, incomplete in 4.75%, and negative in 2.75% of the strains. Virulence factors genes luk, seb, sec, sed, and tst were observed in 3.5%, 0.5%, 1%, 0.25%, and 0.74% isolates, respectively. The gene blaZ was detected in 82.03% of penicillin-resistant isolates, whereas tetK and aac(6′)-Ie?aph(2′)-Ia were observed in 33.87% and 45.15% of the tetracycline and aminoglycosides-resistant isolates, respectively. Fluoroquinolone resistance gene mepA was detected for the first time in S. aureus from bovine mastitis. Resistance genes tetM (3.22%), tetL (1.61%), ermA (14.29%), ermB (14.29%), ermC (33.3%), ermT (9.52%), ermY (4.76%), msrA (9.52%), and mphC (9.52%) were also detected among resistant isolates. No association between virulence factors or antimicrobialresistant genes and year of isolation, geographic origin, or antimicrobial resistance profile was observed. Our results showed that S. aureus strains isolated from bovine mastitis in the four Brazilian states sampled are mainly biofilmforming and hemolytic, whereas virulence genes associated with enterotoxins, luk and tst, were less frequently observed. Moreover, a wide variety of resistance genes that confer resistance to almost all classes of antimicrobial agents approved for use in animals and humans were found. Overall, the data point to a great pathogenic potential of S. aureus associated with bovine mastitis and to the non-negligible risks to public health of staphylococcal infections from animal origin. MenosThis study aimed to evaluate virulence factors and genetic markers of antimicrobial resistance in 400 Staphylococcus aureus strains isolated from bovine mastitis in four Brazilian states, as well as to assess the association between these characteristics and field information. Virulence factors and drug resistance genes were identified by PCR screening. Biofilm-forming and hemolytic phenotype were detected using Congo red Tryptic Soy Broth and defibrinated sheep blood agar, respectively. Of all isolates, 83.5% were biofilm-forming and 98.5% strains exhibited biofilm gene icaAD, and a significant association between phenotype and genotype for biofilm was observed (P = 0.0005). Hemolysin genes were observed in 82.85% (hla+hlb+), 16.5% (hla+) and 0.75% (hlb+) isolates, whereas the hemolytic phenotype exhibited was complete and incomplete hemolysis in 64.25%, complete in 28.25%, incomplete in 4.75%, and negative in 2.75% of the strains. Virulence factors genes luk, seb, sec, sed, and tst were observed in 3.5%, 0.5%, 1%, 0.25%, and 0.74% isolates, respectively. The gene blaZ was detected in 82.03% of penicillin-resistant isolates, whereas tetK and aac(6′)-Ie?aph(2′)-Ia were observed in 33.87% and 45.15% of the tetracycline and aminoglycosides-resistant isolates, respectively. Fluoroquinolone resistance gene mepA was detected for the first time in S. aureus from bovine mastitis. Resistance genes tetM (3.22%), tetL (1.61%), ermA (14.29%), ermB (14.29%), ermC (33.3%), er... Mostrar Tudo |
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Palavras-Chave: |
Hemolisina; Infecção intramamária; Intramammary infection; Mastite; Staphylococci. |
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Thesagro: |
Biofilme; Bovino; Doença Animal; Estafilococo. |
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Thesaurus NAL: |
Biofilm; Hemolysins. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 03482naa a2200373 a 4500
001 2133706
005 2021-08-19
008 2020 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s42770-020-00363-5$2DOI
100 1 $aPEREZ, V. K. C.
245 $aVirulence factors and antimicrobial resistance in Staphylococcus aureus isolated from bovine mastitis in Brazil.$h[electronic resource]
260 $c2020
520 $aThis study aimed to evaluate virulence factors and genetic markers of antimicrobial resistance in 400 Staphylococcus aureus strains isolated from bovine mastitis in four Brazilian states, as well as to assess the association between these characteristics and field information. Virulence factors and drug resistance genes were identified by PCR screening. Biofilm-forming and hemolytic phenotype were detected using Congo red Tryptic Soy Broth and defibrinated sheep blood agar, respectively. Of all isolates, 83.5% were biofilm-forming and 98.5% strains exhibited biofilm gene icaAD, and a significant association between phenotype and genotype for biofilm was observed (P = 0.0005). Hemolysin genes were observed in 82.85% (hla+hlb+), 16.5% (hla+) and 0.75% (hlb+) isolates, whereas the hemolytic phenotype exhibited was complete and incomplete hemolysis in 64.25%, complete in 28.25%, incomplete in 4.75%, and negative in 2.75% of the strains. Virulence factors genes luk, seb, sec, sed, and tst were observed in 3.5%, 0.5%, 1%, 0.25%, and 0.74% isolates, respectively. The gene blaZ was detected in 82.03% of penicillin-resistant isolates, whereas tetK and aac(6′)-Ie?aph(2′)-Ia were observed in 33.87% and 45.15% of the tetracycline and aminoglycosides-resistant isolates, respectively. Fluoroquinolone resistance gene mepA was detected for the first time in S. aureus from bovine mastitis. Resistance genes tetM (3.22%), tetL (1.61%), ermA (14.29%), ermB (14.29%), ermC (33.3%), ermT (9.52%), ermY (4.76%), msrA (9.52%), and mphC (9.52%) were also detected among resistant isolates. No association between virulence factors or antimicrobialresistant genes and year of isolation, geographic origin, or antimicrobial resistance profile was observed. Our results showed that S. aureus strains isolated from bovine mastitis in the four Brazilian states sampled are mainly biofilmforming and hemolytic, whereas virulence genes associated with enterotoxins, luk and tst, were less frequently observed. Moreover, a wide variety of resistance genes that confer resistance to almost all classes of antimicrobial agents approved for use in animals and humans were found. Overall, the data point to a great pathogenic potential of S. aureus associated with bovine mastitis and to the non-negligible risks to public health of staphylococcal infections from animal origin.
650 $aBiofilm
650 $aHemolysins
650 $aBiofilme
650 $aBovino
650 $aDoença Animal
650 $aEstafilococo
653 $aHemolisina
653 $aInfecção intramamária
653 $aIntramammary infection
653 $aMastite
653 $aStaphylococci
700 1 $aCUSTODIO, D. A. C.
700 1 $aSILVA, E. M. M.
700 1 $aOLIVEIRA, J. de
700 1 $aGUIMARÃES, A. S.
700 1 $aBRITO, M. A. V. P.
700 1 $aSOUZA-FILHO, A. F.
700 1 $aHEINEMANN, M. B.
700 1 $aLAGE, A. P.
700 1 $aDORNELES, E. M. S.
773 $tBrazilian Journal of Microbiology$gv. 51, p. 2111-2122, 2020.
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