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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
02/05/2001 |
Data da última atualização: |
02/05/2001 |
Autoria: |
HUNGRIA, M.; VARGAS, M. A. T. |
Título: |
Environmental factors affecting N2 fixation in grain legumes in the tropics, with an emphasis on Brazil. |
Ano de publicação: |
2000 |
Fonte/Imprenta: |
Field Crops Research, Amsterdam, v.65, p.151-164, 2000. |
Idioma: |
Inglês |
Conteúdo: |
Biological nitrogen (N2) fixation is key to sustainable agricultural systems in tropical soils, which are frequently deficient in N. However. high temperature, drought and soil acidity constrain legume root-nodule formation and function in the tropics. In most cases. the microsymbiont is the more affected partner, with plants growing on mineral N usually less sensitive to these stresses. High temperature and moisture deficiency are major causes of nodulation failure, affecting all stages of the symbiosis and limiting rhizobial growth and surviral in soil. They may also contribute to undesirable changes in rhizobia. including plasmid deletions, genomic rearrangements and reduced diversity. Acidity affects several steps in the development of the symbiosis, including the exchange of molecular signals between the legume and the microsymbiont. liming is effective in overcoming soil acidity and aluminium toxicity, but in Brazil few soils are limed to near neutral pH. Selection of rhizobial inoculant strains that are genetically stable under the often harsh soil conditions of this region is essential, but that task is impaired by a lack of knowledge of tolerance in the microsymbiont. However, good results have been obtained by selecting naturally occurring rhizobia from acid tropical soils affected by water stress and high temperatures. In Brazil, increases in grain yields of common bean and soybean have resulted from inoculation with such stress-tolerant strains . Appropriate soil management practices, e.g. no -till, are other approaches that may decrease soil temperatures and preserve moisture, thereby increasing N2 fixation. MenosBiological nitrogen (N2) fixation is key to sustainable agricultural systems in tropical soils, which are frequently deficient in N. However. high temperature, drought and soil acidity constrain legume root-nodule formation and function in the tropics. In most cases. the microsymbiont is the more affected partner, with plants growing on mineral N usually less sensitive to these stresses. High temperature and moisture deficiency are major causes of nodulation failure, affecting all stages of the symbiosis and limiting rhizobial growth and surviral in soil. They may also contribute to undesirable changes in rhizobia. including plasmid deletions, genomic rearrangements and reduced diversity. Acidity affects several steps in the development of the symbiosis, including the exchange of molecular signals between the legume and the microsymbiont. liming is effective in overcoming soil acidity and aluminium toxicity, but in Brazil few soils are limed to near neutral pH. Selection of rhizobial inoculant strains that are genetically stable under the often harsh soil conditions of this region is essential, but that task is impaired by a lack of knowledge of tolerance in the microsymbiont. However, good results have been obtained by selecting naturally occurring rhizobia from acid tropical soils affected by water stress and high temperatures. In Brazil, increases in grain yields of common bean and soybean have resulted from inoculation with such stress-tolerant strains . Appropriate soil... Mostrar Tudo |
Palavras-Chave: |
Brasil. |
Thesagro: |
Acidez do Solo; Cerrado; Condição Ambiental; Fixação de Nitrogênio; Rhizobium. |
Thesaurus Nal: |
Bradyrhizobium; Brazil; environmental factors; nitrogen fixation; soil pH. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02394naa a2200265 a 4500 001 1546795 005 2001-05-02 008 2000 bl --- 0-- u #d 100 1 $aHUNGRIA, M. 245 $aEnvironmental factors affecting N2 fixation in grain legumes in the tropics, with an emphasis on Brazil. 260 $c2000 520 $aBiological nitrogen (N2) fixation is key to sustainable agricultural systems in tropical soils, which are frequently deficient in N. However. high temperature, drought and soil acidity constrain legume root-nodule formation and function in the tropics. In most cases. the microsymbiont is the more affected partner, with plants growing on mineral N usually less sensitive to these stresses. High temperature and moisture deficiency are major causes of nodulation failure, affecting all stages of the symbiosis and limiting rhizobial growth and surviral in soil. They may also contribute to undesirable changes in rhizobia. including plasmid deletions, genomic rearrangements and reduced diversity. Acidity affects several steps in the development of the symbiosis, including the exchange of molecular signals between the legume and the microsymbiont. liming is effective in overcoming soil acidity and aluminium toxicity, but in Brazil few soils are limed to near neutral pH. Selection of rhizobial inoculant strains that are genetically stable under the often harsh soil conditions of this region is essential, but that task is impaired by a lack of knowledge of tolerance in the microsymbiont. However, good results have been obtained by selecting naturally occurring rhizobia from acid tropical soils affected by water stress and high temperatures. In Brazil, increases in grain yields of common bean and soybean have resulted from inoculation with such stress-tolerant strains . Appropriate soil management practices, e.g. no -till, are other approaches that may decrease soil temperatures and preserve moisture, thereby increasing N2 fixation. 650 $aBradyrhizobium 650 $aBrazil 650 $aenvironmental factors 650 $anitrogen fixation 650 $asoil pH 650 $aAcidez do Solo 650 $aCerrado 650 $aCondição Ambiental 650 $aFixação de Nitrogênio 650 $aRhizobium 653 $aBrasil 700 1 $aVARGAS, M. A. T. 773 $tField Crops Research, Amsterdam$gv.65, p.151-164, 2000.
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Registros recuperados : 198 | |
14. | | VARGAS, M. A. T.; DOBEREINER, J. Efeito de níveis crescentes de calagem, manganês, magnésio e boro na simbiose e desenvolvimento vegetativo do Stylosanthes guyanensis. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 9, n. 3, p. 21-28, 1974. (Zootecnia). Título em inglês: The effect of increasing levels of lime, magnesium, manganese and boron on the growth and nitrogen fixation of Stylosanthes guyanensis.Biblioteca(s): Embrapa Unidades Centrais. |
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17. | | VARGAS, M. A. T.; HUNGRIA, M. Legume inoculation in cerrado soils. In: INTERNATIONAL CONGRESS ON NITROGEN FIXATION, 12., 1999, Foz do Iguacu. Nitrogen fixation: from molecules to crop productivity - proceedings. Dordrechet: Kluwer, 2000. p.587-588. (Current Plant Science and Biotechnology in Agriculture, v.38). Editado por Fabio O. Pedrosa, Mariangela Hungria, Geoffrey Yates, William E. Newton.Biblioteca(s): Embrapa Cerrados. |
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Registros recuperados : 198 | |
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