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| Registros recuperados : 95 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
31/07/2012 |
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Data da última atualização: |
07/03/2016 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
SANTOS, P. M.; THORNTON, B.; CORSI, M. |
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Afiliação: |
PATRICIA MENEZES SANTOS, CPPSE; BARRY THORNTON, THE JAMES HUTTON INSTITUE/ ABERDEEN; MOACIR CORSI, PROF. DO DEPARTAMENTO DE ZOOTECNIA - ESALQ/PIRACICABA. |
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Título: |
Adaptation of the C4 grass Panicum maximum to defoliation is related to plasticity of N uptake, mobilisation and allocation patterns. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Scientia Agricola, v. 69, n. 5, p. 293-299, September/Octuber, 2012. |
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Idioma: |
Português |
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Conteúdo: |
Dry mass production and persistence of Panicum maximum pastures depends on nitrogen supply. Defoliation influences N uptake and allocation patterns yet its effects on plasticity of N dynamics in P. maximum have not been investigated. Stable isotopes of N (15N) were used in order to test the hypothesis that defoliation in terms of proportion of the leaf area removed effects N mobilisation, uptake and allocation patterns in P. maximum. The plants were initially cut weekly to a height of either 0.15 m or 0.30 m for seven weeks. Eight weeks after the first defoliation, all plants were defoliated for a final time to remove 0, 25, 50, 75 or 100 % of the area of each individual leaf blade of the main tiller. Root N uptake was reduced when all leaf area was removed, but more lenient defoliation improved N uptake due to a positive effect on specific N uptake. Young leaves, side tillers and roots were the main sinks for N from root uptake. Roots of P. maximum became a net source of N for mobilisation immediately after severe defoliation. Root uptake was the main source of N for new growth in P. maximum plants. Allocation pattern of mobilised N was different from that of N derived from root uptake. It was concluded that adaptation of P. maximum to defoliation is related to plasticity of N uptake, mobilisation and allocation, but changes in N dynamics did not offset negative impacts of complete defoliation of the plants. |
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Palavras-Chave: |
Clipping height; Guineagrass; Organic reserves; Tropical grass. |
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Thesaurus NAL: |
regrowth. |
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Categoria do assunto: |
-- |
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URL: |
http://ainfo.cnptia.embrapa.br/digital/bitstream/item/62717/1/PROCI-2012.00099.pdf
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Marc: |
LEADER 02061naa a2200205 a 4500
001 1930067
005 2016-03-07
008 2012 bl --- 0-- u #d
100 1 $aSANTOS, P. M.
245 $aAdaptation of the C4 grass Panicum maximum to defoliation is related to plasticity of N uptake, mobilisation and allocation patterns.
260 $c2012
520 $aDry mass production and persistence of Panicum maximum pastures depends on nitrogen supply. Defoliation influences N uptake and allocation patterns yet its effects on plasticity of N dynamics in P. maximum have not been investigated. Stable isotopes of N (15N) were used in order to test the hypothesis that defoliation in terms of proportion of the leaf area removed effects N mobilisation, uptake and allocation patterns in P. maximum. The plants were initially cut weekly to a height of either 0.15 m or 0.30 m for seven weeks. Eight weeks after the first defoliation, all plants were defoliated for a final time to remove 0, 25, 50, 75 or 100 % of the area of each individual leaf blade of the main tiller. Root N uptake was reduced when all leaf area was removed, but more lenient defoliation improved N uptake due to a positive effect on specific N uptake. Young leaves, side tillers and roots were the main sinks for N from root uptake. Roots of P. maximum became a net source of N for mobilisation immediately after severe defoliation. Root uptake was the main source of N for new growth in P. maximum plants. Allocation pattern of mobilised N was different from that of N derived from root uptake. It was concluded that adaptation of P. maximum to defoliation is related to plasticity of N uptake, mobilisation and allocation, but changes in N dynamics did not offset negative impacts of complete defoliation of the plants.
650 $aregrowth
653 $aClipping height
653 $aGuineagrass
653 $aOrganic reserves
653 $aTropical grass
700 1 $aTHORNTON, B.
700 1 $aCORSI, M.
773 $tScientia Agricola$gv. 69, n. 5, p. 293-299, September/Octuber, 2012.
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Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
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