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
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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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Embrapa Soja (CNPSO) |
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