Kinetics of phosphorus uptake and root morphology of local and improved varieties of maize

Detalhes bibliográficos
Autor(a) principal: Machado,Cynthia Torres de Toledo
Data de Publicação: 2004
Outros Autores: Furlani,Ângela Maria Cangiani
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Scientia Agrícola (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100012
Resumo: Interspecific and intraspecific differences in the efficiency of utilization of soil phosphorus (P) are explained, in part, by plant morphological and physiological variations, which characterize the plant for nutrient acquisition. As part of a study on maize genotypes characterization for P-uptake and use efficiency, kinetic parameters of P uptake and root morphological characters were evaluated for six local and improved maize varieties, grown in nutrient solution. The kinetic parameters related to P influx were: maximal transport rate (Vmax), the Michaelis-Menten constant (Km), and the external concentration when net uptake is zero (Cmin). Measured root morphological characters were: root length, radius, and surface area. Shoot and root dry matter yield and the P content in these parts were also determined. Diferences among varieties were observed in the kinetic parameters Vmax and Km, root length and in root/shoot dry matter ratio. Lower Km values were better indicatives of P uptake ability of the varietes and were significantly correlated to higher dry matter production and P-efficiency index.
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spelling Kinetics of phosphorus uptake and root morphology of local and improved varieties of maizegenetic variabilityphopshorus acquisitionkinetics parametersroot systemnutritional efficiencyInterspecific and intraspecific differences in the efficiency of utilization of soil phosphorus (P) are explained, in part, by plant morphological and physiological variations, which characterize the plant for nutrient acquisition. As part of a study on maize genotypes characterization for P-uptake and use efficiency, kinetic parameters of P uptake and root morphological characters were evaluated for six local and improved maize varieties, grown in nutrient solution. The kinetic parameters related to P influx were: maximal transport rate (Vmax), the Michaelis-Menten constant (Km), and the external concentration when net uptake is zero (Cmin). Measured root morphological characters were: root length, radius, and surface area. Shoot and root dry matter yield and the P content in these parts were also determined. Diferences among varieties were observed in the kinetic parameters Vmax and Km, root length and in root/shoot dry matter ratio. Lower Km values were better indicatives of P uptake ability of the varietes and were significantly correlated to higher dry matter production and P-efficiency index.Escola Superior de Agricultura "Luiz de Queiroz"2004-02-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100012Scientia Agricola v.61 n.1 2004reponame:Scientia Agrícola (Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/S0103-90162004000100012info:eu-repo/semantics/openAccessMachado,Cynthia Torres de ToledoFurlani,Ângela Maria Cangianieng2004-02-13T00:00:00Zoai:scielo:S0103-90162004000100012Revistahttp://revistas.usp.br/sa/indexPUBhttps://old.scielo.br/oai/scielo-oai.phpscientia@usp.br||alleoni@usp.br1678-992X0103-9016opendoar:2004-02-13T00:00Scientia Agrícola (Online) - Universidade de São Paulo (USP)false
dc.title.none.fl_str_mv Kinetics of phosphorus uptake and root morphology of local and improved varieties of maize
title Kinetics of phosphorus uptake and root morphology of local and improved varieties of maize
spellingShingle Kinetics of phosphorus uptake and root morphology of local and improved varieties of maize
Machado,Cynthia Torres de Toledo
genetic variability
phopshorus acquisition
kinetics parameters
root system
nutritional efficiency
title_short Kinetics of phosphorus uptake and root morphology of local and improved varieties of maize
title_full Kinetics of phosphorus uptake and root morphology of local and improved varieties of maize
title_fullStr Kinetics of phosphorus uptake and root morphology of local and improved varieties of maize
title_full_unstemmed Kinetics of phosphorus uptake and root morphology of local and improved varieties of maize
title_sort Kinetics of phosphorus uptake and root morphology of local and improved varieties of maize
author Machado,Cynthia Torres de Toledo
author_facet Machado,Cynthia Torres de Toledo
Furlani,Ângela Maria Cangiani
author_role author
author2 Furlani,Ângela Maria Cangiani
author2_role author
dc.contributor.author.fl_str_mv Machado,Cynthia Torres de Toledo
Furlani,Ângela Maria Cangiani
dc.subject.por.fl_str_mv genetic variability
phopshorus acquisition
kinetics parameters
root system
nutritional efficiency
topic genetic variability
phopshorus acquisition
kinetics parameters
root system
nutritional efficiency
description Interspecific and intraspecific differences in the efficiency of utilization of soil phosphorus (P) are explained, in part, by plant morphological and physiological variations, which characterize the plant for nutrient acquisition. As part of a study on maize genotypes characterization for P-uptake and use efficiency, kinetic parameters of P uptake and root morphological characters were evaluated for six local and improved maize varieties, grown in nutrient solution. The kinetic parameters related to P influx were: maximal transport rate (Vmax), the Michaelis-Menten constant (Km), and the external concentration when net uptake is zero (Cmin). Measured root morphological characters were: root length, radius, and surface area. Shoot and root dry matter yield and the P content in these parts were also determined. Diferences among varieties were observed in the kinetic parameters Vmax and Km, root length and in root/shoot dry matter ratio. Lower Km values were better indicatives of P uptake ability of the varietes and were significantly correlated to higher dry matter production and P-efficiency index.
publishDate 2004
dc.date.none.fl_str_mv 2004-02-01
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=S0103-90162004000100012
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100012
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0103-90162004000100012
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 Escola Superior de Agricultura "Luiz de Queiroz"
publisher.none.fl_str_mv Escola Superior de Agricultura "Luiz de Queiroz"
dc.source.none.fl_str_mv Scientia Agricola v.61 n.1 2004
reponame:Scientia Agrícola (Online)
instname:Universidade de São Paulo (USP)
instacron:USP
instname_str Universidade de São Paulo (USP)
instacron_str USP
institution USP
reponame_str Scientia Agrícola (Online)
collection Scientia Agrícola (Online)
repository.name.fl_str_mv Scientia Agrícola (Online) - Universidade de São Paulo (USP)
repository.mail.fl_str_mv scientia@usp.br||alleoni@usp.br
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