Seasonal variation of dinitrogen fixation and assimilation of nitrate in tropical forage grasses

Detalhes bibliográficos
Autor(a) principal: Souto, Sebastião Manhães
Data de Publicação: 2014
Outros Autores: Dobereiner, Johanna
Tipo de documento: Artigo
Idioma: por
Título da fonte: Pesquisa Agropecuária Brasileira (Online)
Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/15126
Resumo: A field experiment was carried out to study the seasonal patterns of N2-fixation, assimilation of nitrate and population of N2-fixing bacteria on roots of tropical forage grasses under frequent nitrate applications. The grasses used were: Hyparrhenia rufa (Jaraguá), Digitaria decumbens (cvs. Pangola A-21 and Transvala) and Pennisetum purpureum (cvs. Napier and Cameron). Rainfall and nitrogenase activity were positively correlated (r = 0,76**), especially with the cultivar Cameron, the genotype which showed in general highest nitrogenase activities. There was no difference in. nitrogenase activity among cultivares during the dry season. The effects of fertilization with nitrogen on nitrate reductase activities lasted up to four weeks after each fertilizer application. All genotypes contained less than 10% of the bacteria inside the root, which however in three cultivars, Cameron (r = 0,66**), Pangola (r = 0,45*) and Transvala (r = 0,41*), were significantly correlated with nitrogenase activity of she roots. The larger external population showed no correlation with the nitrogenase activity
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spelling Seasonal variation of dinitrogen fixation and assimilation of nitrate in tropical forage grassesVariação estacional da fixação de n2 e assimilação de nitrato em gramíneas forrageiras tropicaisbiological nitrogen fixation; nitrogenase activity; assimilation of nitrate; nitrate reductase activity; N2-fixing bacteriaatividade da nitrogenase; assimilação de nitrato; atividade da redutase de nitrato; bactéria fixadora de N2 atmosféricoA field experiment was carried out to study the seasonal patterns of N2-fixation, assimilation of nitrate and population of N2-fixing bacteria on roots of tropical forage grasses under frequent nitrate applications. The grasses used were: Hyparrhenia rufa (Jaraguá), Digitaria decumbens (cvs. Pangola A-21 and Transvala) and Pennisetum purpureum (cvs. Napier and Cameron). Rainfall and nitrogenase activity were positively correlated (r = 0,76**), especially with the cultivar Cameron, the genotype which showed in general highest nitrogenase activities. There was no difference in. nitrogenase activity among cultivares during the dry season. The effects of fertilization with nitrogen on nitrate reductase activities lasted up to four weeks after each fertilizer application. All genotypes contained less than 10% of the bacteria inside the root, which however in three cultivars, Cameron (r = 0,66**), Pangola (r = 0,45*) and Transvala (r = 0,41*), were significantly correlated with nitrogenase activity of she roots. The larger external population showed no correlation with the nitrogenase activityFoi feito um experimento de campo com a finalidade de estudar a variação estacional da fixação de N2, assimilação do nitrato, número de bactérias fixadoras de N2 e produtividade de cinco cultivares de gramíneas forrageiras tropicais. As gramíneas foram:Hyparrhenia rufa (jaraguá), Digitaria decumbens cultivares A-21 e Transvala) e Pennisetum purpureum (cultivares Napier e Cameron). Observou-se uma correlação altamente significativa (r = 0,76**) entre precipitação e atividade da nitrogenase, sendo mais evidente essa influência na cv. Cameron. Não houve diferença na atividade da nitrogenase entre genótipos no período seco. Os efeitos do N na redutase de nitrato foram observados, no máximo, até quatro semanas após cada aplicação da adubação. Em todos os genótipos, menos de 10% das bactérias estavam localizadas na parte interna da raiz. Contudo, houve correlação, nas-três cultivares, Cameron (r = 0,66**), Pangola (r = 0,45*) e Transvala (r = 0,41*), das bactérias no interior das raízes com a atividade da nitrogenase. A população maior de bactérias no exterior das raízes não mostrou correlação nenhuma com a atividade da nitrogenase.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraSouto, Sebastião ManhãesDobereiner, Johanna2014-04-17info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/15126Pesquisa Agropecuaria Brasileira; v.20, n.3, mar. 1985; 319-334Pesquisa Agropecuária Brasileira; v.20, n.3, mar. 1985; 319-3341678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/15126/8902info:eu-repo/semantics/openAccess2014-04-17T11:47:55Zoai:ojs.seer.sct.embrapa.br:article/15126Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-04-17T11:47:55Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Seasonal variation of dinitrogen fixation and assimilation of nitrate in tropical forage grasses
Variação estacional da fixação de n2 e assimilação de nitrato em gramíneas forrageiras tropicais
title Seasonal variation of dinitrogen fixation and assimilation of nitrate in tropical forage grasses
spellingShingle Seasonal variation of dinitrogen fixation and assimilation of nitrate in tropical forage grasses
Souto, Sebastião Manhães
biological nitrogen fixation; nitrogenase activity; assimilation of nitrate; nitrate reductase activity; N2-fixing bacteria
atividade da nitrogenase; assimilação de nitrato; atividade da redutase de nitrato; bactéria fixadora de N2 atmosférico
title_short Seasonal variation of dinitrogen fixation and assimilation of nitrate in tropical forage grasses
title_full Seasonal variation of dinitrogen fixation and assimilation of nitrate in tropical forage grasses
title_fullStr Seasonal variation of dinitrogen fixation and assimilation of nitrate in tropical forage grasses
title_full_unstemmed Seasonal variation of dinitrogen fixation and assimilation of nitrate in tropical forage grasses
title_sort Seasonal variation of dinitrogen fixation and assimilation of nitrate in tropical forage grasses
author Souto, Sebastião Manhães
author_facet Souto, Sebastião Manhães
Dobereiner, Johanna
author_role author
author2 Dobereiner, Johanna
author2_role author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Souto, Sebastião Manhães
Dobereiner, Johanna
dc.subject.por.fl_str_mv biological nitrogen fixation; nitrogenase activity; assimilation of nitrate; nitrate reductase activity; N2-fixing bacteria
atividade da nitrogenase; assimilação de nitrato; atividade da redutase de nitrato; bactéria fixadora de N2 atmosférico
topic biological nitrogen fixation; nitrogenase activity; assimilation of nitrate; nitrate reductase activity; N2-fixing bacteria
atividade da nitrogenase; assimilação de nitrato; atividade da redutase de nitrato; bactéria fixadora de N2 atmosférico
description A field experiment was carried out to study the seasonal patterns of N2-fixation, assimilation of nitrate and population of N2-fixing bacteria on roots of tropical forage grasses under frequent nitrate applications. The grasses used were: Hyparrhenia rufa (Jaraguá), Digitaria decumbens (cvs. Pangola A-21 and Transvala) and Pennisetum purpureum (cvs. Napier and Cameron). Rainfall and nitrogenase activity were positively correlated (r = 0,76**), especially with the cultivar Cameron, the genotype which showed in general highest nitrogenase activities. There was no difference in. nitrogenase activity among cultivares during the dry season. The effects of fertilization with nitrogen on nitrate reductase activities lasted up to four weeks after each fertilizer application. All genotypes contained less than 10% of the bacteria inside the root, which however in three cultivars, Cameron (r = 0,66**), Pangola (r = 0,45*) and Transvala (r = 0,41*), were significantly correlated with nitrogenase activity of she roots. The larger external population showed no correlation with the nitrogenase activity
publishDate 2014
dc.date.none.fl_str_mv 2014-04-17
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/15126
url https://seer.sct.embrapa.br/index.php/pab/article/view/15126
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/15126/8902
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
dc.source.none.fl_str_mv Pesquisa Agropecuaria Brasileira; v.20, n.3, mar. 1985; 319-334
Pesquisa Agropecuária Brasileira; v.20, n.3, mar. 1985; 319-334
1678-3921
0100-104x
reponame:Pesquisa Agropecuária Brasileira (Online)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Pesquisa Agropecuária Brasileira (Online)
collection Pesquisa Agropecuária Brasileira (Online)
repository.name.fl_str_mv Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv pab@sct.embrapa.br || sct.pab@embrapa.br
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