Effects of photosynthate manipulation on biological nitrogen fixation in common bean plants

Detalhes bibliográficos
Autor(a) principal: Hungria, Mariangela
Data de Publicação: 2014
Outros Autores: Neves, Maria Cristina P.
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/14650
Resumo: Two experiments were performed, under greenhouse conditions, to investigate the effect of availability of carbon to the nodules on biological nitrogen fixation in common bean plants. Removal of flowers initially increased nitrogenase activity, relative efficiency of electrons for nitrogenase (RE) and rate of nitrogen translocation in the xylem sap, but within ten days all these parameters decreased due to an acceleration of nodule senescence. The removal of 50% of the leaves at flowering decreased nitrogenase activity, RE and N translocation in the xylem sap, but after ten days the plants began recover in these parameters due to the production of new leaves, which did not happen when the leaves where removed at mid-pod filling stage. The stem ringing, hampering translocation of photosynthates to the nodules, decreased nitrogenase activity, RE, and N transport in xylem sap, but the decrease in nitrogenase activity occurred 24 hours after ringing, indicating that in bean roots there is a considerable quantity of stored substrates for N2 fixation.
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spelling Effects of photosynthate manipulation on biological nitrogen fixation in common bean plantsEfeito da manipulação de fotossintatos na fixação biológica de nitrogênio em feijoeiroRhizobium; nitrogenase activity; hydrogen release; nitrogen assimilation, ureidesRhizobium; atividade da nitrogenase; liberação do hidrogênio; assimilação de nitrogênio; ureídosTwo experiments were performed, under greenhouse conditions, to investigate the effect of availability of carbon to the nodules on biological nitrogen fixation in common bean plants. Removal of flowers initially increased nitrogenase activity, relative efficiency of electrons for nitrogenase (RE) and rate of nitrogen translocation in the xylem sap, but within ten days all these parameters decreased due to an acceleration of nodule senescence. The removal of 50% of the leaves at flowering decreased nitrogenase activity, RE and N translocation in the xylem sap, but after ten days the plants began recover in these parameters due to the production of new leaves, which did not happen when the leaves where removed at mid-pod filling stage. The stem ringing, hampering translocation of photosynthates to the nodules, decreased nitrogenase activity, RE, and N transport in xylem sap, but the decrease in nitrogenase activity occurred 24 hours after ringing, indicating that in bean roots there is a considerable quantity of stored substrates for N2 fixation.Em dois experimentos, conduzidos em casa de vegetação, procurou-se verificar o efeito da disponibilidade de carbono para os nódulos na fixação biológica de nitrogênio em feijoeiro (Phaseolus vulgaris L.). A retirada das flores aumentou, inicialmente, a atividade da nitrogenase, a eficiência relativa dos elétrons destinados à nitrogenase (ER) e a taxa de translocação dos compostos nitrogenados na seiva do xilema, mas dentro de dez dias houve uma queda drástica nesses parâmetros, em virtude da aceleração no processo de  senescência dos nódulos. A retirada de 50% das folhas no florescimento provocou um declínio na atividade da nitrogenase, na ER e no transporte de N na seiva do xilema, mas, após dez dias, iniciou-se uma recuperação, atribuída à produção de folhas novas, o que não ocorreu quando a retirada das folhas foi realizada no período médio de enchimento dos grãos. O  anelamento do caule do feijão, impedindo a translocação de  fotossintatos para os nódulos, provocou uma queda na atividade da nitrogenase, na ER e no transporte de N na seiva, mas o decréscimo na atividade da nitrogenase só ocorreu 24 horas após o anelamento, indicando que no sistema radicular de feijão há uma quantidade considerável de substratos de reserva para a fixação de nitrogênio.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraHungria, MariangelaNeves, Maria Cristina P.2014-04-17info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/14650Pesquisa Agropecuaria Brasileira; v.21, n.1, jan. 1986; 9-24Pesquisa Agropecuária Brasileira; v.21, n.1, jan. 1986; 9-241678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/14650/8334info:eu-repo/semantics/openAccess2014-10-20T17:05:27Zoai:ojs.seer.sct.embrapa.br:article/14650Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-10-20T17:05:27Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Effects of photosynthate manipulation on biological nitrogen fixation in common bean plants
Efeito da manipulação de fotossintatos na fixação biológica de nitrogênio em feijoeiro
title Effects of photosynthate manipulation on biological nitrogen fixation in common bean plants
spellingShingle Effects of photosynthate manipulation on biological nitrogen fixation in common bean plants
Hungria, Mariangela
Rhizobium; nitrogenase activity; hydrogen release; nitrogen assimilation, ureides
Rhizobium; atividade da nitrogenase; liberação do hidrogênio; assimilação de nitrogênio; ureídos
title_short Effects of photosynthate manipulation on biological nitrogen fixation in common bean plants
title_full Effects of photosynthate manipulation on biological nitrogen fixation in common bean plants
title_fullStr Effects of photosynthate manipulation on biological nitrogen fixation in common bean plants
title_full_unstemmed Effects of photosynthate manipulation on biological nitrogen fixation in common bean plants
title_sort Effects of photosynthate manipulation on biological nitrogen fixation in common bean plants
author Hungria, Mariangela
author_facet Hungria, Mariangela
Neves, Maria Cristina P.
author_role author
author2 Neves, Maria Cristina P.
author2_role author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Hungria, Mariangela
Neves, Maria Cristina P.
dc.subject.por.fl_str_mv Rhizobium; nitrogenase activity; hydrogen release; nitrogen assimilation, ureides
Rhizobium; atividade da nitrogenase; liberação do hidrogênio; assimilação de nitrogênio; ureídos
topic Rhizobium; nitrogenase activity; hydrogen release; nitrogen assimilation, ureides
Rhizobium; atividade da nitrogenase; liberação do hidrogênio; assimilação de nitrogênio; ureídos
description Two experiments were performed, under greenhouse conditions, to investigate the effect of availability of carbon to the nodules on biological nitrogen fixation in common bean plants. Removal of flowers initially increased nitrogenase activity, relative efficiency of electrons for nitrogenase (RE) and rate of nitrogen translocation in the xylem sap, but within ten days all these parameters decreased due to an acceleration of nodule senescence. The removal of 50% of the leaves at flowering decreased nitrogenase activity, RE and N translocation in the xylem sap, but after ten days the plants began recover in these parameters due to the production of new leaves, which did not happen when the leaves where removed at mid-pod filling stage. The stem ringing, hampering translocation of photosynthates to the nodules, decreased nitrogenase activity, RE, and N transport in xylem sap, but the decrease in nitrogenase activity occurred 24 hours after ringing, indicating that in bean roots there is a considerable quantity of stored substrates for N2 fixation.
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/14650
url https://seer.sct.embrapa.br/index.php/pab/article/view/14650
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/14650/8334
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.21, n.1, jan. 1986; 9-24
Pesquisa Agropecuária Brasileira; v.21, n.1, jan. 1986; 9-24
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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