Interactions of nitrate-reductase and nitrogenase activities in maize genotypes
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , |
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/16676 |
Resumo: | In two field experiments the effects of plant genotype on the interaction of nitrogenase activity (N2-ase) in roots and nitrate-reductase activity (NR) in leaves were studied. Higher nitrogenase activities in the cultivar Piranão thon in UR-I were confirmed, but one cycle of massal selection for high N2-ase was not effective. Lines of UR-I in S2 selection for high and low N2-ase, on the other hand, showed significant differences. In both experiments N2-ase activity in roots showed negative correlations with NR in leaves, even when plant genotype was the only source of variance. The slope of these regressions, that is, the proportion of increase of N2-ase with decreasing NR varied with age of the plant and nitrogen level in soil. The grain yield of both cultivars did not differ significantly. Nitrogen applications were significant only at the 40 kg/ha level. The results of the paper indicate that maize breeding for increased nitrogen fixation should include studies on the interactions of nitrate assimilation to permit selection of maize genotypes which permit complementation of nitrogen fixation with nitrogen fertilizers. |
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Interactions of nitrate-reductase and nitrogenase activities in maize genotypesEfeito do genótipo do milho na atividade da nitrogenase e da nitrato-redutasemaize; nitrogen; fixation; nitrato reductase; genotypemilho; nitrogênio; fixação; nitrato-redutase; genótipoIn two field experiments the effects of plant genotype on the interaction of nitrogenase activity (N2-ase) in roots and nitrate-reductase activity (NR) in leaves were studied. Higher nitrogenase activities in the cultivar Piranão thon in UR-I were confirmed, but one cycle of massal selection for high N2-ase was not effective. Lines of UR-I in S2 selection for high and low N2-ase, on the other hand, showed significant differences. In both experiments N2-ase activity in roots showed negative correlations with NR in leaves, even when plant genotype was the only source of variance. The slope of these regressions, that is, the proportion of increase of N2-ase with decreasing NR varied with age of the plant and nitrogen level in soil. The grain yield of both cultivars did not differ significantly. Nitrogen applications were significant only at the 40 kg/ha level. The results of the paper indicate that maize breeding for increased nitrogen fixation should include studies on the interactions of nitrate assimilation to permit selection of maize genotypes which permit complementation of nitrogen fixation with nitrogen fertilizers.Em dois experimentos de campo, estudou-se o efeito do genótipo do milho na interação entre atividade da nitrogenase (N2-ase) nas raízes e da nitrato-redutase (NR) nas folhas. Confirmou-se maior nitrogenase na cultivar Piranão que na UR-I, mas um ciclo de seleção para alta fixação de N2 não teve efeito. Linhagens da UR-I em S2 selecionadas para alta e baixa fixação de N2 por outro lado mostraram diferenças significativas. Em ambos os experimentos a atividade da nitrogenase nas raízes mostrou correlação altamente significativa (P = 0,01) e negativa com o NR nas folhas, mesmo quando a fonte de variação foi o genótipo. O "slope" da regressão, isto é, a proporção do aumento da N2-ase com decréscimo do NR variou com a idade da planta e com o nível de NO-3 no solo. A produção de grãos na cultivar Piranão não foi maior que na UR-I. A aplicação de 40 kg N/ha aumentou a produção, mas dosagens maiores tiveram pouco efeito. Os resultados indicam que trabalhos de melhoramento de milho que focalizam aumentos da fixação de N2 necessariamente deverão incluir estudos simultâneos da NR para que se possam obter genótipos que permitam complementação da fixação de N2 com adubos nitrogenados.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraBaldani, José IvoBlana, Roberto Antonio GoicDobereiner, Johanna2014-04-15info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/16676Pesquisa Agropecuaria Brasileira; v.14, n.2, fev. 1979; 165-173Pesquisa Agropecuária Brasileira; v.14, n.2, fev. 1979; 165-1731678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/16676/10986info:eu-repo/semantics/openAccess2014-04-15T19:23:20Zoai:ojs.seer.sct.embrapa.br:article/16676Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-04-15T19:23:20Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Interactions of nitrate-reductase and nitrogenase activities in maize genotypes Efeito do genótipo do milho na atividade da nitrogenase e da nitrato-redutase |
title |
Interactions of nitrate-reductase and nitrogenase activities in maize genotypes |
spellingShingle |
Interactions of nitrate-reductase and nitrogenase activities in maize genotypes Baldani, José Ivo maize; nitrogen; fixation; nitrato reductase; genotype milho; nitrogênio; fixação; nitrato-redutase; genótipo |
title_short |
Interactions of nitrate-reductase and nitrogenase activities in maize genotypes |
title_full |
Interactions of nitrate-reductase and nitrogenase activities in maize genotypes |
title_fullStr |
Interactions of nitrate-reductase and nitrogenase activities in maize genotypes |
title_full_unstemmed |
Interactions of nitrate-reductase and nitrogenase activities in maize genotypes |
title_sort |
Interactions of nitrate-reductase and nitrogenase activities in maize genotypes |
author |
Baldani, José Ivo |
author_facet |
Baldani, José Ivo Blana, Roberto Antonio Goic Dobereiner, Johanna |
author_role |
author |
author2 |
Blana, Roberto Antonio Goic Dobereiner, Johanna |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Baldani, José Ivo Blana, Roberto Antonio Goic Dobereiner, Johanna |
dc.subject.por.fl_str_mv |
maize; nitrogen; fixation; nitrato reductase; genotype milho; nitrogênio; fixação; nitrato-redutase; genótipo |
topic |
maize; nitrogen; fixation; nitrato reductase; genotype milho; nitrogênio; fixação; nitrato-redutase; genótipo |
description |
In two field experiments the effects of plant genotype on the interaction of nitrogenase activity (N2-ase) in roots and nitrate-reductase activity (NR) in leaves were studied. Higher nitrogenase activities in the cultivar Piranão thon in UR-I were confirmed, but one cycle of massal selection for high N2-ase was not effective. Lines of UR-I in S2 selection for high and low N2-ase, on the other hand, showed significant differences. In both experiments N2-ase activity in roots showed negative correlations with NR in leaves, even when plant genotype was the only source of variance. The slope of these regressions, that is, the proportion of increase of N2-ase with decreasing NR varied with age of the plant and nitrogen level in soil. The grain yield of both cultivars did not differ significantly. Nitrogen applications were significant only at the 40 kg/ha level. The results of the paper indicate that maize breeding for increased nitrogen fixation should include studies on the interactions of nitrate assimilation to permit selection of maize genotypes which permit complementation of nitrogen fixation with nitrogen fertilizers. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-04-15 |
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/16676 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/16676 |
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/16676/10986 |
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.14, n.2, fev. 1979; 165-173 Pesquisa Agropecuária Brasileira; v.14, n.2, fev. 1979; 165-173 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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1793416653785006080 |