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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
05/06/2000 |
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Data da última atualização: |
05/06/2000 |
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Autoria: |
JONES, D. L. |
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Título: |
Amino acid biodegradation and its potential effects on organic nitrogen capture by plants. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Soil Biology and Biochemistry, Oxford, v. 31, p. 613-622, 1999. |
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Idioma: |
Inglês |
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Conteúdo: |
It has been reported that plant roots can directly utilise soil organic-N in the form of amino acids without prior mineralisation by the soil's microbial biomass. To critically assess this, however, requires a knowledge of microbial amino acid-N turnover times in soil. The effects of soil type, depth and temperature on the uptake and partitioning of a mixture of 15 14C-labelled amino acids by the soil's microbial biomass was therefore studied in 10 contrasting soil types. The results indicated that the degradation of amino acids was soil dependent but that the mean half-life in topsoils at 18 graus centigrafos was 1.7 mais ou menos 0.6 h, whilst in subsoils the mean half-life was 12.2 mais ou menos 3.3 h. On average 34% of the amino acid-C was respired as CO2 whilst 66% was utilised for new cell biomass. Amino acid decomposition increased with soil temperature, however, rapid rates of amino acid uptake and assimilation were also observed at 5 graus centigrafos (mean half-life in topsoil = 2.9 mais ou menos 1.5h). Little correlation was observed between amino acid half-life and either microbial yield, soil arginase activity or organic matter content (r2 menor 0.40), however, decomposition did appear to be weakly related with soil respiration. The high concentration of amino acids used here (5 mM) was intended to simulate amino acid release after root cell lysis. For previously reported lower concentrations in the bulk soil solution, half lives can be predicted to be even less based on microbial amino acid transport kinetics. The significance of this previously overlooked microbial decomposition of amino acids in the utilisation of organic N by plants is discussed. MenosIt has been reported that plant roots can directly utilise soil organic-N in the form of amino acids without prior mineralisation by the soil's microbial biomass. To critically assess this, however, requires a knowledge of microbial amino acid-N turnover times in soil. The effects of soil type, depth and temperature on the uptake and partitioning of a mixture of 15 14C-labelled amino acids by the soil's microbial biomass was therefore studied in 10 contrasting soil types. The results indicated that the degradation of amino acids was soil dependent but that the mean half-life in topsoils at 18 graus centigrafos was 1.7 mais ou menos 0.6 h, whilst in subsoils the mean half-life was 12.2 mais ou menos 3.3 h. On average 34% of the amino acid-C was respired as CO2 whilst 66% was utilised for new cell biomass. Amino acid decomposition increased with soil temperature, however, rapid rates of amino acid uptake and assimilation were also observed at 5 graus centigrafos (mean half-life in topsoil = 2.9 mais ou menos 1.5h). Little correlation was observed between amino acid half-life and either microbial yield, soil arginase activity or organic matter content (r2 menor 0.40), however, decomposition did appear to be weakly related with soil respiration. The high concentration of amino acids used here (5 mM) was intended to simulate amino acid release after root cell lysis. For previously reported lower concentrations in the bulk soil solution, half lives can be predicted to be even less... Mostrar Tudo |
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Palavras-Chave: |
Biomassa microbiana; Decomposition. |
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Thesagro: |
Aminoácido; Biodegradação; Decomposição; Matéria Orgânica; Solo; Temperatura. |
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Thesaurus Nal: |
amino acids; biodegradation; degradation; microbial biomass; organic matter; soil; temperature. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02509naa a2200301 a 4500
001 1621168
005 2000-06-05
008 1999 bl --- 0-- u #d
100 1 $aJONES, D. L.
245 $aAmino acid biodegradation and its potential effects on organic nitrogen capture by plants.
260 $c1999
520 $aIt has been reported that plant roots can directly utilise soil organic-N in the form of amino acids without prior mineralisation by the soil's microbial biomass. To critically assess this, however, requires a knowledge of microbial amino acid-N turnover times in soil. The effects of soil type, depth and temperature on the uptake and partitioning of a mixture of 15 14C-labelled amino acids by the soil's microbial biomass was therefore studied in 10 contrasting soil types. The results indicated that the degradation of amino acids was soil dependent but that the mean half-life in topsoils at 18 graus centigrafos was 1.7 mais ou menos 0.6 h, whilst in subsoils the mean half-life was 12.2 mais ou menos 3.3 h. On average 34% of the amino acid-C was respired as CO2 whilst 66% was utilised for new cell biomass. Amino acid decomposition increased with soil temperature, however, rapid rates of amino acid uptake and assimilation were also observed at 5 graus centigrafos (mean half-life in topsoil = 2.9 mais ou menos 1.5h). Little correlation was observed between amino acid half-life and either microbial yield, soil arginase activity or organic matter content (r2 menor 0.40), however, decomposition did appear to be weakly related with soil respiration. The high concentration of amino acids used here (5 mM) was intended to simulate amino acid release after root cell lysis. For previously reported lower concentrations in the bulk soil solution, half lives can be predicted to be even less based on microbial amino acid transport kinetics. The significance of this previously overlooked microbial decomposition of amino acids in the utilisation of organic N by plants is discussed.
650 $aamino acids
650 $abiodegradation
650 $adegradation
650 $amicrobial biomass
650 $aorganic matter
650 $asoil
650 $atemperature
650 $aAminoácido
650 $aBiodegradação
650 $aDecomposição
650 $aMatéria Orgânica
650 $aSolo
650 $aTemperatura
653 $aBiomassa microbiana
653 $aDecomposition
773 $tSoil Biology and Biochemistry, Oxford$gv. 31, p. 613-622, 1999.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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Registro Completo
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Biblioteca(s): |
Embrapa Algodão; Embrapa Arroz e Feijão; Embrapa Meio-Norte; Embrapa Milho e Sorgo. |
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Data corrente: |
04/12/2015 |
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Data da última atualização: |
04/12/2015 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
ROCHA, M. de M.; SILVA, K. J. D. e; NEVES, A. C. das; MIRANDA, C. H. B.; FAVARO, S. P.; FERREIRA, G. B.; DENARDIN, J. E.; SILVA FILHO, P. M. da; NEUMAIER, N.; CRUZ, I.; CARVALHO, M. da C. S.; ALMEIDA, R. P. de; MUTADIUA, C. A. P.; NAPITA, I. C.; IPO, A. do R.; SIMBA, D. |
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Afiliação: |
MAURISRAEL DE MOURA ROCHA, CPAMN; KAESEL JACKSON DAMASCENO E SILVA, CPAMN; ADAO CABRAL DAS NEVES, CPAMN; CESAR HERACLIDES BEHLING MIRANDA, CNPAE; SIMONE PALMA FAVARO, CNPAE; GILVAN BARBOSA FERREIRA, CNPA; JOSE ELOIR DENARDIN, CNPT; PEDRO MOREIRA DA SILVA FILHO, CNPSO; NORMAN NEUMAIER, CNPSO; IVAN CRUZ, CNPMS; MARIA DA CONCEICAO SANTANA CARVALHO, CNPAF; RAUL PORFIRIO DE ALMEIDA, CNPA; CELSO AMÉRICO PEDRO MUTADIUA, PNDU/ABC/MRE; IDALINA CELESTINO NAPITA, INTITUTO DE INVESTIGAÇÃO AGRÁRIA DE MOÇAMBIQUE; ANTONIO DO ROSÁRIO IPO, INTITUTO DE INVESTIGAÇÃO AGRÁRIA DE MOÇAMBIQUE; DOMINGOS SIMBA, INTITUTO DE INVESTIGAÇÃO AGRÁRIA DE MOÇAMBIQUE. |
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Título: |
Inoculação do feijão Nhemba com estirpes de Rizóbio em Nampula, Moçambique. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
In: SEMINÁRIO DE DIVULGAÇÃO DE RESULTADOS DA INVESTIGAÇÃO AGRÁRIA NO CORREDOR DE NACALA, 2., 2015, Lichinga, Moçambique. Anais... Lichinga, Moçambique: Instituto de Investigação Agrária de Moçambique, 2015. Editado por Fernando João Sualei, Oscar Chichongue, Guilhermino Boina, Simone Palma Favaro, Cesar Heraclides Behling Miranda. p. 449-454. |
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Idioma: |
Português |
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Thesagro: |
Aclimatação; Estirpe; Feijão de corda; Inoculação; Resposta da planta; Rhizobium; Vigna unguiculata. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/131482/1/ID43303-2015SDRIACNacala-p449.pdf
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Marc: |
LEADER 01360naa a2200373 a 4500
001 2030724
005 2015-12-04
008 2015 bl uuuu u00u1 u #d
100 1 $aROCHA, M. de M.
245 $aInoculação do feijão Nhemba com estirpes de Rizóbio em Nampula, Moçambique.$h[electronic resource]
260 $c2015
650 $aAclimatação
650 $aEstirpe
650 $aFeijão de corda
650 $aInoculação
650 $aResposta da planta
650 $aRhizobium
650 $aVigna unguiculata
700 1 $aSILVA, K. J. D. e
700 1 $aNEVES, A. C. das
700 1 $aMIRANDA, C. H. B.
700 1 $aFAVARO, S. P.
700 1 $aFERREIRA, G. B.
700 1 $aDENARDIN, J. E.
700 1 $aSILVA FILHO, P. M. da
700 1 $aNEUMAIER, N.
700 1 $aCRUZ, I.
700 1 $aCARVALHO, M. da C. S.
700 1 $aALMEIDA, R. P. de
700 1 $aMUTADIUA, C. A. P.
700 1 $aNAPITA, I. C.
700 1 $aIPO, A. do R.
700 1 $aSIMBA, D.
773 $tIn: SEMINÁRIO DE DIVULGAÇÃO DE RESULTADOS DA INVESTIGAÇÃO AGRÁRIA NO CORREDOR DE NACALA, 2., 2015, Lichinga, Moçambique. Anais... Lichinga, Moçambique: Instituto de Investigação Agrária de Moçambique, 2015. Editado por Fernando João Sualei, Oscar Chichongue, Guilhermino Boina, Simone Palma Favaro, Cesar Heraclides Behling Miranda. p. 449-454.
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Embrapa Meio-Norte (CPAMN) |
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