Seasonal variation of dinitrogen fixation and assimilation of nitrate in tropical forage grasses
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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Pesquisa Agropecuaria Brasileira
2014
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rev-pab-br-article-151262014-04-17T11:47:55Z 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 Souto, Sebastião Manhães Dobereiner, Johanna 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 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 Foi 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 Brasileira Pesquisa Agropecuária Brasileira 2014-04-17 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://seer.sct.embrapa.br/index.php/pab/article/view/15126 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 por https://seer.sct.embrapa.br/index.php/pab/article/view/15126/8902 |
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Souto, Sebastião Manhães Dobereiner, Johanna |
| spellingShingle |
Souto, Sebastião Manhães Dobereiner, Johanna Seasonal variation of dinitrogen fixation and assimilation of nitrate in tropical forage grasses |
| author_facet |
Souto, Sebastião Manhães Dobereiner, Johanna |
| author_sort |
Souto, Sebastião Manhães |
| title |
Seasonal variation of dinitrogen fixation and assimilation of nitrate in tropical forage grasses |
| 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 |
| 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 |
| publisher |
Pesquisa Agropecuaria Brasileira |
| publishDate |
2014 |
| url |
https://seer.sct.embrapa.br/index.php/pab/article/view/15126 |
| work_keys_str_mv |
AT soutosebastiaomanhaes seasonalvariationofdinitrogenfixationandassimilationofnitrateintropicalforagegrasses AT dobereinerjohanna seasonalvariationofdinitrogenfixationandassimilationofnitrateintropicalforagegrasses AT soutosebastiaomanhaes variacaoestacionaldafixacaoden2eassimilacaodenitratoemgramineasforrageirastropicais AT dobereinerjohanna variacaoestacionaldafixacaoden2eassimilacaodenitratoemgramineasforrageirastropicais |
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1813448930166308864 |