| Registro completo |
| Provedor de dados: |
Scientia Agricola
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| País: |
Brazil
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| Título: |
Kinetics of phosphorus uptake and root morphology of local and improved varieties of maize
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| Autores: |
Machado,Cynthia Torres de Toledo
Furlani,Ângela Maria Cangiani
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| Data: |
2004-02-01
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| Ano: |
2004
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| Palavras-chave: |
Genetic variability
Phopshorus acquisition
Kinetics parameters
Root system
Nutritional efficiency
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| 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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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100012
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| Editor: |
São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
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| Relação: |
10.1590/S0103-90162004000100012
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| Formato: |
text/html
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| Fonte: |
Scientia Agricola v.61 n.1 2004
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| Direitos: |
info:eu-repo/semantics/openAccess
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