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 | Acesso ao texto completo restrito à biblioteca da Embrapa Solos. Para informações adicionais entre em contato com cnps.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
13/11/2019 |
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Data da última atualização: |
11/11/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
CHALK, P. M.; INACIO, C. de T.; CHEN, D. |
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Afiliação: |
PHILLIP MICHAEL CHALK, UNIVERSITY OF MELBOURNE; CAIO DE TEVES INACIO, CNPS; DELI CHEN, UNIVERSITY OF MELBOURNE. |
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Título: |
An overview of contemporary advances in the usage of 15N natural abundance (delta N-15) as a tracer of agro-ecosystem N cycle processes that impact the environment. |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
Agriculture, Ecosystems & Environment, v. 283, 106570, Nov. 2019. |
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DOI: |
https://doi.org/10.1016/j.agee.2019.106570 |
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Idioma: |
Inglês |
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Conteúdo: |
During the past 20 years there have been major advances in the application of 15N natural abundance (NA) measurements to trace the pathways and magnitudes of N fluxes in the soil-plant-atmosphere continuum. However, estimates are often not quantitative due to the unknown extent of isotopic fractionation during a particular N transformation under study, when other processes compete simultaneously for substrate. Examples are the estimation of N fertilizer use efficiency or the transfer of biologically-fixed N2 to non-fixing companion species in intercrops or crop sequences. In some cases it has been possible to identify a particular process or source leading to a change in the relative isotopic composition (delta15N signature) of a system component, by innovative selection of experimental conditions that isolate the source or process from confounding factors. Nevertheless, there are examples where significant contemporary advances have occurred in the application of NA as a quantitative tracer, such as in the estimation of the symbiotic dependence of a range of N2 fixing plants. The key is the estimation of isotopic fractionation during N2 fixation and assimilation, and new knowledge has been obtained on factors contributing to variation, and new approaches devised to obtain more accurate estimates of fractionation. A second example is the innovative application of isotopomer measurements of the potent greenhouse gas N2O that enable presumptive identification of the biological and chemical processes resulting in its production under various agricultural scenarios. MenosDuring the past 20 years there have been major advances in the application of 15N natural abundance (NA) measurements to trace the pathways and magnitudes of N fluxes in the soil-plant-atmosphere continuum. However, estimates are often not quantitative due to the unknown extent of isotopic fractionation during a particular N transformation under study, when other processes compete simultaneously for substrate. Examples are the estimation of N fertilizer use efficiency or the transfer of biologically-fixed N2 to non-fixing companion species in intercrops or crop sequences. In some cases it has been possible to identify a particular process or source leading to a change in the relative isotopic composition (delta15N signature) of a system component, by innovative selection of experimental conditions that isolate the source or process from confounding factors. Nevertheless, there are examples where significant contemporary advances have occurred in the application of NA as a quantitative tracer, such as in the estimation of the symbiotic dependence of a range of N2 fixing plants. The key is the estimation of isotopic fractionation during N2 fixation and assimilation, and new knowledge has been obtained on factors contributing to variation, and new approaches devised to obtain more accurate estimates of fractionation. A second example is the innovative application of isotopomer measurements of the potent greenhouse gas N2O that enable presumptive identification of the biological... Mostrar Tudo |
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Thesagro: |
Amônia; Composto Orgânico; Fertilizante; Nitrogênio; Solo. |
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Thesaurus Nal: |
Ammonia; Composts; Fertilizers; Soil. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02420naa a2200265 a 4500
001 2114276
005 2021-11-11
008 2019 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.agee.2019.106570$2DOI
100 1 $aCHALK, P. M.
245 $aAn overview of contemporary advances in the usage of 15N natural abundance (delta N-15) as a tracer of agro-ecosystem N cycle processes that impact the environment.$h[electronic resource]
260 $c2019
520 $aDuring the past 20 years there have been major advances in the application of 15N natural abundance (NA) measurements to trace the pathways and magnitudes of N fluxes in the soil-plant-atmosphere continuum. However, estimates are often not quantitative due to the unknown extent of isotopic fractionation during a particular N transformation under study, when other processes compete simultaneously for substrate. Examples are the estimation of N fertilizer use efficiency or the transfer of biologically-fixed N2 to non-fixing companion species in intercrops or crop sequences. In some cases it has been possible to identify a particular process or source leading to a change in the relative isotopic composition (delta15N signature) of a system component, by innovative selection of experimental conditions that isolate the source or process from confounding factors. Nevertheless, there are examples where significant contemporary advances have occurred in the application of NA as a quantitative tracer, such as in the estimation of the symbiotic dependence of a range of N2 fixing plants. The key is the estimation of isotopic fractionation during N2 fixation and assimilation, and new knowledge has been obtained on factors contributing to variation, and new approaches devised to obtain more accurate estimates of fractionation. A second example is the innovative application of isotopomer measurements of the potent greenhouse gas N2O that enable presumptive identification of the biological and chemical processes resulting in its production under various agricultural scenarios.
650 $aAmmonia
650 $aComposts
650 $aFertilizers
650 $aSoil
650 $aAmônia
650 $aComposto Orgânico
650 $aFertilizante
650 $aNitrogênio
650 $aSolo
700 1 $aINACIO, C. de T.
700 1 $aCHEN, D.
773 $tAgriculture, Ecosystems & Environment$gv. 283, 106570, Nov. 2019.
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Embrapa Solos (CNPS) |
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Registro Completo
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
28/11/2011 |
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Data da última atualização: |
31/07/2017 |
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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: |
KASCHUK, G.; YIN, XINYOU; HUNGRIA, M.; LEFFELAAR, P. A.; GILLER, K. E.; KUYPER, T. W. |
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Afiliação: |
GLACIELA KASCHUK, Universidade Paranaense, Umuarama.; XINYOU YIN, Centre for Crop Systems Analysis, Wageningen.; MARIANGELA HUNGRIA DA CUNHA, CNPSO; PETER A. LEFFELAAR, Wageningen University; KEN E. GILLER, Wageningen University; THOMAS W. KUYPER, Wageningen University. |
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Título: |
Photosynthetic adaptation of soybean due to varying effectiveness of N2 fixation by two distinct Bradyrhizobium japonicum strains. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Environmental and Experimental Botany, Wageningen, v. 76, p. 1-6, Feb. 2012. |
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ISSN: |
0098-8472 |
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DOI: |
10.1016/j.envexpbot.2011.10.002 |
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Idioma: |
Inglês |
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Conteúdo: |
Rhizobial N2 fixation is a costly biochemical process, which takes 6?14% of current photosynthate (C) from legumes, without compromising grain productivity. In addition to the effects of leaf N nutrition, rhizobial symbiosis could stimulate photosynthesis due to the removal of C sink limitation by nodule activity. To test that hypothesis, we compared the photosynthetic capacity of soybean plants inoculated with two different strains of Bradyrhizobium japonicum (CPAC 390 or CPAC 7), varying in the effectiveness to fix N2, with plants fertilized with NO3?. Nodulated plants had 14?31% higher rates of photosynthesis and accumulated less starch in the leaves than N-fertilized plants. There was evidence that B. japonicum CPAC 390 had higher carbon costs of N2 fixation compared with CPAC 7, but the increases in carbon costs were accompanied by higher rates of photosynthesis. By applying a biochemical model of leaf photosynthesis, including the limitations of Rubisco activity (VCmax ), electron transport rates (J) and triose-P utilization (TPU), we show that soybean plants adapt their photosynthetic capacity to support the stronger carbon sink created by faster rates of N2 fixation. We observed that plants associated with CPAC 7 (of low effectiveness to fix N2) increased their photosynthesis by removing sink limitation solely (with a constant VCmax ) whereas plants associated with CPAC 390 (of high effectiveness to fix N2) increased their photosynthesis by sink stimulation. Based on the model, we propose that sink stimulation is governed by a positive feedback between TPU and Rubisco activation, resulting in an increased VCmax . MenosRhizobial N2 fixation is a costly biochemical process, which takes 6?14% of current photosynthate (C) from legumes, without compromising grain productivity. In addition to the effects of leaf N nutrition, rhizobial symbiosis could stimulate photosynthesis due to the removal of C sink limitation by nodule activity. To test that hypothesis, we compared the photosynthetic capacity of soybean plants inoculated with two different strains of Bradyrhizobium japonicum (CPAC 390 or CPAC 7), varying in the effectiveness to fix N2, with plants fertilized with NO3?. Nodulated plants had 14?31% higher rates of photosynthesis and accumulated less starch in the leaves than N-fertilized plants. There was evidence that B. japonicum CPAC 390 had higher carbon costs of N2 fixation compared with CPAC 7, but the increases in carbon costs were accompanied by higher rates of photosynthesis. By applying a biochemical model of leaf photosynthesis, including the limitations of Rubisco activity (VCmax ), electron transport rates (J) and triose-P utilization (TPU), we show that soybean plants adapt their photosynthetic capacity to support the stronger carbon sink created by faster rates of N2 fixation. We observed that plants associated with CPAC 7 (of low effectiveness to fix N2) increased their photosynthesis by removing sink limitation solely (with a constant VCmax ) whereas plants associated with CPAC 390 (of high effectiveness to fix N2) increased their photosynthesis by sink stimulation. Based on... Mostrar Tudo |
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Thesagro: |
Fixação de nitrogênio; Soja. |
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Thesaurus NAL: |
Nitrogen fixation; Soybeans. |
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Categoria do assunto: |
S Ciências Biológicas |
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Marc: |
LEADER 02425naa a2200253 a 4500
001 1907420
005 2017-07-31
008 2012 bl uuuu u00u1 u #d
022 $a0098-8472
024 7 $a10.1016/j.envexpbot.2011.10.002$2DOI
100 1 $aKASCHUK, G.
245 $aPhotosynthetic adaptation of soybean due to varying effectiveness of N2 fixation by two distinct Bradyrhizobium japonicum strains.
260 $c2012
520 $aRhizobial N2 fixation is a costly biochemical process, which takes 6?14% of current photosynthate (C) from legumes, without compromising grain productivity. In addition to the effects of leaf N nutrition, rhizobial symbiosis could stimulate photosynthesis due to the removal of C sink limitation by nodule activity. To test that hypothesis, we compared the photosynthetic capacity of soybean plants inoculated with two different strains of Bradyrhizobium japonicum (CPAC 390 or CPAC 7), varying in the effectiveness to fix N2, with plants fertilized with NO3?. Nodulated plants had 14?31% higher rates of photosynthesis and accumulated less starch in the leaves than N-fertilized plants. There was evidence that B. japonicum CPAC 390 had higher carbon costs of N2 fixation compared with CPAC 7, but the increases in carbon costs were accompanied by higher rates of photosynthesis. By applying a biochemical model of leaf photosynthesis, including the limitations of Rubisco activity (VCmax ), electron transport rates (J) and triose-P utilization (TPU), we show that soybean plants adapt their photosynthetic capacity to support the stronger carbon sink created by faster rates of N2 fixation. We observed that plants associated with CPAC 7 (of low effectiveness to fix N2) increased their photosynthesis by removing sink limitation solely (with a constant VCmax ) whereas plants associated with CPAC 390 (of high effectiveness to fix N2) increased their photosynthesis by sink stimulation. Based on the model, we propose that sink stimulation is governed by a positive feedback between TPU and Rubisco activation, resulting in an increased VCmax .
650 $aNitrogen fixation
650 $aSoybeans
650 $aFixação de nitrogênio
650 $aSoja
700 1 $aYIN, XINYOU
700 1 $aHUNGRIA, M.
700 1 $aLEFFELAAR, P. A.
700 1 $aGILLER, K. E.
700 1 $aKUYPER, T. W.
773 $tEnvironmental and Experimental Botany, Wageningen$gv. 76, p. 1-6, Feb. 2012.
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