Tomato root growth and phosphorus absorption kinetics by tomato plants as affected by phosphorus concentration in nutrient solution
Autor(a) principal: | |
---|---|
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/16112 |
Resumo: | To evaluate the effects of P concentrations in nutrient solution on root growth and on root physiological characteristics involved in P uptake by tomato Lycopersicon esculentum Mill plants, six seedlings were grown in nutrient solution at initial concentrations of 48.5, 97, 194 and 388 µM P until one day before harvest. They were then transferred to solutions with P at 20 µM and 30 µM, and the depletion curves and Michaelis-Menten parameters were determined. Increases in the initial P concentration increased plant dry weight and shoot: root dry weight ratio. Imax values decreased with the increase in the concentration of P in the treatment solution; however, these were not significantly affected by P concentration in the depletion solution. Variation in KM values were not statistically significant. The relative net P influx increased with decreased P concentrations in the nutrient solution, mainly due to increase Imax values. The conclusions were that as P supply increased and as the plant P contents are sufficient for maximum growth, the rate of P uptake tends to be lower. The results also indicate that total P uptake by tomato seedlings depends on the amount of root surface area exposed to P. |
id |
EMBRAPA-4_f1aad7a300ce0f9d05000b94ed00a6ba |
---|---|
oai_identifier_str |
oai:ojs.seer.sct.embrapa.br:article/16112 |
network_acronym_str |
EMBRAPA-4 |
network_name_str |
Pesquisa Agropecuária Brasileira (Online) |
repository_id_str |
|
spelling |
Tomato root growth and phosphorus absorption kinetics by tomato plants as affected by phosphorus concentration in nutrient solutionCrescimento do sistema radicular e cinética da absorção de fósforo pelo tomateiro afetados por concentrações de fósforo na solução nutritivaphosphorus uptake; Michaelis-Menten parameters; Lycopersicon esculentumparâmetros de Michaelis-Menten; Lycopersicon esculentumTo evaluate the effects of P concentrations in nutrient solution on root growth and on root physiological characteristics involved in P uptake by tomato Lycopersicon esculentum Mill plants, six seedlings were grown in nutrient solution at initial concentrations of 48.5, 97, 194 and 388 µM P until one day before harvest. They were then transferred to solutions with P at 20 µM and 30 µM, and the depletion curves and Michaelis-Menten parameters were determined. Increases in the initial P concentration increased plant dry weight and shoot: root dry weight ratio. Imax values decreased with the increase in the concentration of P in the treatment solution; however, these were not significantly affected by P concentration in the depletion solution. Variation in KM values were not statistically significant. The relative net P influx increased with decreased P concentrations in the nutrient solution, mainly due to increase Imax values. The conclusions were that as P supply increased and as the plant P contents are sufficient for maximum growth, the rate of P uptake tends to be lower. The results also indicate that total P uptake by tomato seedlings depends on the amount of root surface area exposed to P.Objetivou-se avaliar os efeitos de concentrações de P na solução nutritiva sobre o crescimento e características fisiológicas das raízes envolvidas na absorção de P pelo tomateiro Lycopersicon esculentum Mill. Cresceram-se seis plantas em solução nutritiva contendo concentrações iniciais de 48,5, 97, 194 e 388 µM de P até um dia antes da colheita, quando foram substituídas por outra contendo 20 ou 30 µM P. Com essas concentrações iniciais, estabeleceram-se as curvas de depleção de P, que foram utilizadas na determinação dos parâmetros de Michaelis-Menten. Com o aumento da concentração inicial de P, aumentaram-se o peso seco das plantas e a relação entre peso seco da parte aérea e da raiz. Os valores de Imax decresceram com o aumento da concentração de P nos tratamentos; entretanto, não foram significantemente afetados pela concentração de P na solução de depleção. Variações nos valores de KM não foram estatisticamente significantes. O influxo líquido relativo de P aumentou com o decréscimo na concentração de P, principalmente em virtude do aumento nos valores de Imax Conclui-se que, à medida que o suprimento de P é aumentado e as plantas contém o suficiente P para o máximo desenvolvimento, a taxa de absorção de P tende a ser menor. Os resultados também indicam que a absorção de P depende da área de raiz exposta ao P.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraFontes, Paulo Cezar RezendeBarber, Stanley A.2014-04-16info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/16112Pesquisa Agropecuaria Brasileira; v.19, n.10, out. 1984; 1203-1210Pesquisa Agropecuária Brasileira; v.19, n.10, out. 1984; 1203-12101678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/16112/10266info:eu-repo/semantics/openAccess2014-04-16T19:09:29Zoai:ojs.seer.sct.embrapa.br:article/16112Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-04-16T19:09:29Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Tomato root growth and phosphorus absorption kinetics by tomato plants as affected by phosphorus concentration in nutrient solution Crescimento do sistema radicular e cinética da absorção de fósforo pelo tomateiro afetados por concentrações de fósforo na solução nutritiva |
title |
Tomato root growth and phosphorus absorption kinetics by tomato plants as affected by phosphorus concentration in nutrient solution |
spellingShingle |
Tomato root growth and phosphorus absorption kinetics by tomato plants as affected by phosphorus concentration in nutrient solution Fontes, Paulo Cezar Rezende phosphorus uptake; Michaelis-Menten parameters; Lycopersicon esculentum parâmetros de Michaelis-Menten; Lycopersicon esculentum |
title_short |
Tomato root growth and phosphorus absorption kinetics by tomato plants as affected by phosphorus concentration in nutrient solution |
title_full |
Tomato root growth and phosphorus absorption kinetics by tomato plants as affected by phosphorus concentration in nutrient solution |
title_fullStr |
Tomato root growth and phosphorus absorption kinetics by tomato plants as affected by phosphorus concentration in nutrient solution |
title_full_unstemmed |
Tomato root growth and phosphorus absorption kinetics by tomato plants as affected by phosphorus concentration in nutrient solution |
title_sort |
Tomato root growth and phosphorus absorption kinetics by tomato plants as affected by phosphorus concentration in nutrient solution |
author |
Fontes, Paulo Cezar Rezende |
author_facet |
Fontes, Paulo Cezar Rezende Barber, Stanley A. |
author_role |
author |
author2 |
Barber, Stanley A. |
author2_role |
author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Fontes, Paulo Cezar Rezende Barber, Stanley A. |
dc.subject.por.fl_str_mv |
phosphorus uptake; Michaelis-Menten parameters; Lycopersicon esculentum parâmetros de Michaelis-Menten; Lycopersicon esculentum |
topic |
phosphorus uptake; Michaelis-Menten parameters; Lycopersicon esculentum parâmetros de Michaelis-Menten; Lycopersicon esculentum |
description |
To evaluate the effects of P concentrations in nutrient solution on root growth and on root physiological characteristics involved in P uptake by tomato Lycopersicon esculentum Mill plants, six seedlings were grown in nutrient solution at initial concentrations of 48.5, 97, 194 and 388 µM P until one day before harvest. They were then transferred to solutions with P at 20 µM and 30 µM, and the depletion curves and Michaelis-Menten parameters were determined. Increases in the initial P concentration increased plant dry weight and shoot: root dry weight ratio. Imax values decreased with the increase in the concentration of P in the treatment solution; however, these were not significantly affected by P concentration in the depletion solution. Variation in KM values were not statistically significant. The relative net P influx increased with decreased P concentrations in the nutrient solution, mainly due to increase Imax values. The conclusions were that as P supply increased and as the plant P contents are sufficient for maximum growth, the rate of P uptake tends to be lower. The results also indicate that total P uptake by tomato seedlings depends on the amount of root surface area exposed to P. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-04-16 |
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/16112 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/16112 |
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/16112/10266 |
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.19, n.10, out. 1984; 1203-1210 Pesquisa Agropecuária Brasileira; v.19, n.10, out. 1984; 1203-1210 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 |
_version_ |
1793416664105091072 |