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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
25/04/2007 |
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Data da última atualização: |
03/08/2017 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BATISTA, J. S. S.; HUNGRIA, M.; BARCELLOS, F. G.; FERREIRA, M. C.; MENDES, I. C. |
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Afiliação: |
JESIANE STEFÂNIA SILVA BATISTA, UEL; MARIANGELA HUNGRIA DA CUNHA, CNPSO; FERNANDO GOMES BARCELLOS; MAGDA CRISTIANI FERREIRA, UEL; IÊDA CARVALHO MENDES. |
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Título: |
Variability in Bradyrhizobium japonicum and B. elkanii seven years after introduction of both the exotic microsymbiont and the soybean host in a cerrados soil. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Microbial Ecology, New York, v. 53, n. 2, p. 270-284, Feb. 2007. |
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ISSN: |
0095-3628 |
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DOI: |
10.1007/s00248-006-9149-2 |
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Idioma: |
Inglês |
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Conteúdo: |
The plasticity of rhizobial genomes is far greater than previously thought, with complex genomic recombination events that may be accelerated by the often stressful environmental conditions of the tropics. This study aimed at evaluating changes in soybean rhizobia due to adaptation to inhospitable environmental conditions (high temperatures, drought, and acid soils) in the Brazilian Cerrados. Both the host plant and combinations of four strains of soybean Bradyrhizobium were introduced in an uncropped soil devoid of rhizobia capable of nodulating soybean. After the third year, seeds were not reinoculated. Two hundred and sixty-three isolates were obtained from nodules of field-grown soybean after the seventh year, and their morphological, physiological, serological, and symbiotic properties determined, followed by genetic analysis of conserved and symbiotic genes. B. japonicum strain CPAC 15 (same serogroup as USDA 123) was characterized as having high saprophytic capacity and competitiveness and by the seventh year represented up to 70% of the cultivable population, in contrast to the poor survival and competitiveness of B. japonicum strain CPAC 7 (same serogroup as CB 1809). In general, adapted strains had increased mucoidy, and up to 43% of the isolates showed no serological reaction. High variability, presumably resulting from the adaptation to the harsh environmental conditions, was verified in rep-PCR (polymerase chain reaction) profiles, being lower in strain CPAC 15, intermediate in B. elkanii, and higher in CPAC 7. Restriction fragment length polymorphism (RFLP)-PCR types of the 16S rDNA corresponded to the following: one type for B. elkanii species, two for B. japonicum, associated to CPAC 15 and CPAC 7, and unknown combinations of profiles. However, when nodC sequences and RFLP-PCR of the nifH region data were considered, only two clusters were observed having full congruence with B. japonicum and B. elkanii species. Combining the results, variability was such that even within a genetically more stable group (such as that of CPAC 15), only 6.4% of the isolates showed high similarity to the inoculant strain, whereas none was similar to CPAC 7. The genetic variability in our study seems to result from a variety and combination of events including strain dispersion, genomic recombination, and horizontal gene transfer. Furthermore, the genetic variability appears to be mainly associated with adaptation, saprophytic capacity, and competitiveness, and not with symbiotic effectiveness, as the similarity of symbiotic genes was higher than that of conserved regions of the DNA. MenosThe plasticity of rhizobial genomes is far greater than previously thought, with complex genomic recombination events that may be accelerated by the often stressful environmental conditions of the tropics. This study aimed at evaluating changes in soybean rhizobia due to adaptation to inhospitable environmental conditions (high temperatures, drought, and acid soils) in the Brazilian Cerrados. Both the host plant and combinations of four strains of soybean Bradyrhizobium were introduced in an uncropped soil devoid of rhizobia capable of nodulating soybean. After the third year, seeds were not reinoculated. Two hundred and sixty-three isolates were obtained from nodules of field-grown soybean after the seventh year, and their morphological, physiological, serological, and symbiotic properties determined, followed by genetic analysis of conserved and symbiotic genes. B. japonicum strain CPAC 15 (same serogroup as USDA 123) was characterized as having high saprophytic capacity and competitiveness and by the seventh year represented up to 70% of the cultivable population, in contrast to the poor survival and competitiveness of B. japonicum strain CPAC 7 (same serogroup as CB 1809). In general, adapted strains had increased mucoidy, and up to 43% of the isolates showed no serological reaction. High variability, presumably resulting from the adaptation to the harsh environmental conditions, was verified in rep-PCR (polymerase chain reaction) profiles, being lower in strain CPAC 15,... Mostrar Tudo |
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Thesagro: |
Rhizobium; Soja. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03319naa a2200217 a 4500
001 1469973
005 2017-08-03
008 2007 bl uuuu u00u1 u #d
022 $a0095-3628
024 7 $a10.1007/s00248-006-9149-2$2DOI
100 1 $aBATISTA, J. S. S.
245 $aVariability in Bradyrhizobium japonicum and B. elkanii seven years after introduction of both the exotic microsymbiont and the soybean host in a cerrados soil.
260 $c2007
520 $aThe plasticity of rhizobial genomes is far greater than previously thought, with complex genomic recombination events that may be accelerated by the often stressful environmental conditions of the tropics. This study aimed at evaluating changes in soybean rhizobia due to adaptation to inhospitable environmental conditions (high temperatures, drought, and acid soils) in the Brazilian Cerrados. Both the host plant and combinations of four strains of soybean Bradyrhizobium were introduced in an uncropped soil devoid of rhizobia capable of nodulating soybean. After the third year, seeds were not reinoculated. Two hundred and sixty-three isolates were obtained from nodules of field-grown soybean after the seventh year, and their morphological, physiological, serological, and symbiotic properties determined, followed by genetic analysis of conserved and symbiotic genes. B. japonicum strain CPAC 15 (same serogroup as USDA 123) was characterized as having high saprophytic capacity and competitiveness and by the seventh year represented up to 70% of the cultivable population, in contrast to the poor survival and competitiveness of B. japonicum strain CPAC 7 (same serogroup as CB 1809). In general, adapted strains had increased mucoidy, and up to 43% of the isolates showed no serological reaction. High variability, presumably resulting from the adaptation to the harsh environmental conditions, was verified in rep-PCR (polymerase chain reaction) profiles, being lower in strain CPAC 15, intermediate in B. elkanii, and higher in CPAC 7. Restriction fragment length polymorphism (RFLP)-PCR types of the 16S rDNA corresponded to the following: one type for B. elkanii species, two for B. japonicum, associated to CPAC 15 and CPAC 7, and unknown combinations of profiles. However, when nodC sequences and RFLP-PCR of the nifH region data were considered, only two clusters were observed having full congruence with B. japonicum and B. elkanii species. Combining the results, variability was such that even within a genetically more stable group (such as that of CPAC 15), only 6.4% of the isolates showed high similarity to the inoculant strain, whereas none was similar to CPAC 7. The genetic variability in our study seems to result from a variety and combination of events including strain dispersion, genomic recombination, and horizontal gene transfer. Furthermore, the genetic variability appears to be mainly associated with adaptation, saprophytic capacity, and competitiveness, and not with symbiotic effectiveness, as the similarity of symbiotic genes was higher than that of conserved regions of the DNA.
650 $aRhizobium
650 $aSoja
700 1 $aHUNGRIA, M.
700 1 $aBARCELLOS, F. G.
700 1 $aFERREIRA, M. C.
700 1 $aMENDES, I. C.
773 $tMicrobial Ecology, New York$gv. 53, n. 2, p. 270-284, Feb. 2007.
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Registro original: |
Embrapa Soja (CNPSO) |
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Registro Completo
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
04/01/2008 |
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Data da última atualização: |
09/07/2018 |
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Autoria: |
SILVA, J. Q.; SOUZA, M. I. T. de; GONÇALVES, P. de S.; AGUIAR, A. T. da E.; GOUVÊA, L. R. L.; PINOTTI, R. N. |
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Afiliação: |
Juliano Quarteroli Silva, Instituto Agronômico/Programa Seringueira; Mario Ivo Tavares de Souza, Fazenda Sant a Gilda/Grupo Rodobéns Agrícola e Pecuária Ltda.; Paulo de Souza Gonçalves, Instituto Agronômico/Programa Seringueira; Adriano Tosoni da Eira Aguiar, Instituto Agronômico/Programa Seringueira; Lígia Regina Lima Gouvêa, Instituto Agronômico/Programa Seringueira; Raquel Nakazato Pinotti, Apta Regional Centro Oeste. |
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Título: |
Viabilidade econômica de diferentes sistemas de sangria em clones de seringueira. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 42, n. 3, p. 349-356, mar. 2007 |
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Idioma: |
Português |
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Notas: |
Título em inglês: Economic viability of different tapping systems in rubber tree clones. |
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Conteúdo: |
O objetivo deste trabalho foi avaliar o desempenho produtivo e os aspectos econômicos de três clones de seringueira [Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell. Arg.], sob nove sistemas de sangria. O experimento foi instalado sob delineamento de blocos ao acaso com parcelas subdivididas no tempo. Os tratamentos principais foram os clones PR 255, RRIM 600 e GT 1, submetidos aos seguintes sistemas de sangria: ½S d/3 6d/7.11m/y.ET 2,5% Pa La 8/y; ½S d/3 6d/7.11m/y.ET 5,0% Pa La 8/y; ½S d/4 6d/7.11m/y.ET 2,5% Pa La 8/y; ½S d/4 6d/7.11m/y.ET 5,0% Pa La 8/y; ½S d/5 6d/7.11m/y.ET 2,5% Pa La 8/y; ½S d/5 6d/7.11m/y.ET 5,0% Pa La 8/y; ½S d/7 6d/7.11m/y.ET 2,5% Pa La 8/y; ½S d/7 6d/7.11m/y.ET 5,0% Pa La 8/y e ½S d/2 6d/7.11m/y (testemunha). As variáveis estudadas foram: perímetro do caule, produtividade de borracha seca e secamento do painel. Também foi avaliada a viabilidade econômica dos sistemas de sangria. Observaram-se maior produtividade e rentabilidade dos sistemas ½S d/3.ET 2,5% 8/y para os clones PR 255 e RRIM 600 e ½S d/7.ET 2,5% 8/y para o clone GT 1, comparados com a testemunha. A maior e a menor porcentagem de secamento do painel foram observadas nos sistemas ½S d/3 ET 5,0% 8/y e ½S d/7.ET 5,0% 8/y, respectivamente |
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Palavras-Chave: |
borracha natural; brown bast; economy; estimulação; natural rubber; secamento do painel; stimulation. |
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Thesagro: |
Economia; Hevea Brasiliensis. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/106940/1/Viabilidade.pdf
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Marc: |
LEADER 02201naa a2200301 a 4500
001 1123769
005 2018-07-09
008 2007 bl uuuu u00u1 u #d
100 1 $aSILVA, J. Q.
245 $aViabilidade econômica de diferentes sistemas de sangria em clones de seringueira.
260 $c2007
500 $aTítulo em inglês: Economic viability of different tapping systems in rubber tree clones.
520 $aO objetivo deste trabalho foi avaliar o desempenho produtivo e os aspectos econômicos de três clones de seringueira [Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell. Arg.], sob nove sistemas de sangria. O experimento foi instalado sob delineamento de blocos ao acaso com parcelas subdivididas no tempo. Os tratamentos principais foram os clones PR 255, RRIM 600 e GT 1, submetidos aos seguintes sistemas de sangria: ½S d/3 6d/7.11m/y.ET 2,5% Pa La 8/y; ½S d/3 6d/7.11m/y.ET 5,0% Pa La 8/y; ½S d/4 6d/7.11m/y.ET 2,5% Pa La 8/y; ½S d/4 6d/7.11m/y.ET 5,0% Pa La 8/y; ½S d/5 6d/7.11m/y.ET 2,5% Pa La 8/y; ½S d/5 6d/7.11m/y.ET 5,0% Pa La 8/y; ½S d/7 6d/7.11m/y.ET 2,5% Pa La 8/y; ½S d/7 6d/7.11m/y.ET 5,0% Pa La 8/y e ½S d/2 6d/7.11m/y (testemunha). As variáveis estudadas foram: perímetro do caule, produtividade de borracha seca e secamento do painel. Também foi avaliada a viabilidade econômica dos sistemas de sangria. Observaram-se maior produtividade e rentabilidade dos sistemas ½S d/3.ET 2,5% 8/y para os clones PR 255 e RRIM 600 e ½S d/7.ET 2,5% 8/y para o clone GT 1, comparados com a testemunha. A maior e a menor porcentagem de secamento do painel foram observadas nos sistemas ½S d/3 ET 5,0% 8/y e ½S d/7.ET 5,0% 8/y, respectivamente
650 $aEconomia
650 $aHevea Brasiliensis
653 $aborracha natural
653 $abrown bast
653 $aeconomy
653 $aestimulação
653 $anatural rubber
653 $asecamento do painel
653 $astimulation
700 1 $aSOUZA, M. I. T. de
700 1 $aGONÇALVES, P. de S.
700 1 $aAGUIAR, A. T. da E.
700 1 $aGOUVÊA, L. R. L.
700 1 $aPINOTTI, R. N.
773 $tPesquisa Agropecuária Brasileira, Brasília, DF$gv. 42, n. 3, p. 349-356, mar. 2007
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