Soluble fractions and kinetics parameters of nitrate and ammonium uptake in sunflower (“Neon” Hybrid)
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Revista ciência agronômica (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000100013 |
Resumo: | ABSTRACT Sunflower plants are source of oilseeds with great importance for agroenergy. Nitrogen deficiency is considered one of the factors limiting growth and yield. The objective of this study was to assess the nitrogen uptake (high and low supply of nitrate and ammonium) and to determine the uptake kinetics parameters (Km and Vmax) of these ions in sunflower plants (Neon hybrid). The experiment was carried out in a growth chamber using a hydroponic system. The following treatments were applied: 0.2 and 2.0 mmol L-1 of N-NO3- and N-NH4+. The two kinetics parameters (Km and Vmax) involved in the uptake of nitrate and ammonium were determined, as well as the soluble fractions (N-NO3-, N-NH4+, amino-N and sugars) and total N, in different plant tissues. The plants grown with ammonium showed higher Vmax than those cultivated with nitrate. High ammonium rates caused reduction of root volume and the plants supplied with 2.0 mmol L-1 of N-NO3- produced more biomass from the roots and aerial part. The highest concentrations of NNO3- were found in the petioles. Analyzed together, the data suggest a greater potential for use of nitric-N as a nitrogen source for fertilization in the cultivation of sunflower. |
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Soluble fractions and kinetics parameters of nitrate and ammonium uptake in sunflower (“Neon” Hybrid)Helianthus annuus L.Oilseed plantsTotal NNitrogenABSTRACT Sunflower plants are source of oilseeds with great importance for agroenergy. Nitrogen deficiency is considered one of the factors limiting growth and yield. The objective of this study was to assess the nitrogen uptake (high and low supply of nitrate and ammonium) and to determine the uptake kinetics parameters (Km and Vmax) of these ions in sunflower plants (Neon hybrid). The experiment was carried out in a growth chamber using a hydroponic system. The following treatments were applied: 0.2 and 2.0 mmol L-1 of N-NO3- and N-NH4+. The two kinetics parameters (Km and Vmax) involved in the uptake of nitrate and ammonium were determined, as well as the soluble fractions (N-NO3-, N-NH4+, amino-N and sugars) and total N, in different plant tissues. The plants grown with ammonium showed higher Vmax than those cultivated with nitrate. High ammonium rates caused reduction of root volume and the plants supplied with 2.0 mmol L-1 of N-NO3- produced more biomass from the roots and aerial part. The highest concentrations of NNO3- were found in the petioles. Analyzed together, the data suggest a greater potential for use of nitric-N as a nitrogen source for fertilization in the cultivation of sunflower.Universidade Federal do Ceará2016-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000100013Revista Ciência Agronômica v.47 n.1 2016reponame:Revista ciência agronômica (Online)instname:Universidade Federal do Ceará (UFC)instacron:UFC10.5935/1806-6690.20160002info:eu-repo/semantics/openAccessAlves,Luiziene SoaresTorres Junior,Carlos VergaraFernandes,Manlio SilvestreSantos,André Marques dosSouza,Sonia Regina deeng2015-11-30T00:00:00Zoai:scielo:S1806-66902016000100013Revistahttp://www.ccarevista.ufc.br/PUBhttps://old.scielo.br/oai/scielo-oai.php||alekdutra@ufc.br|| ccarev@ufc.br1806-66900045-6888opendoar:2015-11-30T00:00Revista ciência agronômica (Online) - Universidade Federal do Ceará (UFC)false |
dc.title.none.fl_str_mv |
Soluble fractions and kinetics parameters of nitrate and ammonium uptake in sunflower (“Neon” Hybrid) |
title |
Soluble fractions and kinetics parameters of nitrate and ammonium uptake in sunflower (“Neon” Hybrid) |
spellingShingle |
Soluble fractions and kinetics parameters of nitrate and ammonium uptake in sunflower (“Neon” Hybrid) Alves,Luiziene Soares Helianthus annuus L. Oilseed plants Total N Nitrogen |
title_short |
Soluble fractions and kinetics parameters of nitrate and ammonium uptake in sunflower (“Neon” Hybrid) |
title_full |
Soluble fractions and kinetics parameters of nitrate and ammonium uptake in sunflower (“Neon” Hybrid) |
title_fullStr |
Soluble fractions and kinetics parameters of nitrate and ammonium uptake in sunflower (“Neon” Hybrid) |
title_full_unstemmed |
Soluble fractions and kinetics parameters of nitrate and ammonium uptake in sunflower (“Neon” Hybrid) |
title_sort |
Soluble fractions and kinetics parameters of nitrate and ammonium uptake in sunflower (“Neon” Hybrid) |
author |
Alves,Luiziene Soares |
author_facet |
Alves,Luiziene Soares Torres Junior,Carlos Vergara Fernandes,Manlio Silvestre Santos,André Marques dos Souza,Sonia Regina de |
author_role |
author |
author2 |
Torres Junior,Carlos Vergara Fernandes,Manlio Silvestre Santos,André Marques dos Souza,Sonia Regina de |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Alves,Luiziene Soares Torres Junior,Carlos Vergara Fernandes,Manlio Silvestre Santos,André Marques dos Souza,Sonia Regina de |
dc.subject.por.fl_str_mv |
Helianthus annuus L. Oilseed plants Total N Nitrogen |
topic |
Helianthus annuus L. Oilseed plants Total N Nitrogen |
description |
ABSTRACT Sunflower plants are source of oilseeds with great importance for agroenergy. Nitrogen deficiency is considered one of the factors limiting growth and yield. The objective of this study was to assess the nitrogen uptake (high and low supply of nitrate and ammonium) and to determine the uptake kinetics parameters (Km and Vmax) of these ions in sunflower plants (Neon hybrid). The experiment was carried out in a growth chamber using a hydroponic system. The following treatments were applied: 0.2 and 2.0 mmol L-1 of N-NO3- and N-NH4+. The two kinetics parameters (Km and Vmax) involved in the uptake of nitrate and ammonium were determined, as well as the soluble fractions (N-NO3-, N-NH4+, amino-N and sugars) and total N, in different plant tissues. The plants grown with ammonium showed higher Vmax than those cultivated with nitrate. High ammonium rates caused reduction of root volume and the plants supplied with 2.0 mmol L-1 of N-NO3- produced more biomass from the roots and aerial part. The highest concentrations of NNO3- were found in the petioles. Analyzed together, the data suggest a greater potential for use of nitric-N as a nitrogen source for fertilization in the cultivation of sunflower. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-03-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000100013 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000100013 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.5935/1806-6690.20160002 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Universidade Federal do Ceará |
publisher.none.fl_str_mv |
Universidade Federal do Ceará |
dc.source.none.fl_str_mv |
Revista Ciência Agronômica v.47 n.1 2016 reponame:Revista ciência agronômica (Online) instname:Universidade Federal do Ceará (UFC) instacron:UFC |
instname_str |
Universidade Federal do Ceará (UFC) |
instacron_str |
UFC |
institution |
UFC |
reponame_str |
Revista ciência agronômica (Online) |
collection |
Revista ciência agronômica (Online) |
repository.name.fl_str_mv |
Revista ciência agronômica (Online) - Universidade Federal do Ceará (UFC) |
repository.mail.fl_str_mv |
||alekdutra@ufc.br|| ccarev@ufc.br |
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1750297488023093248 |