Phosphorus uptake kinetics and nitrogen fractions in maize grown in nutrient solutions

Autores

  • Leandro Martins Ferreira Universidade Federal Rural do Rio de Janeiro
  • Rafael Passos Rangel Universidade Federal Rural do Rio de Janeiro
  • Orlando Carlos Huertas Tavares Universidade Federal Rural do Rio de Janeiro
  • Leandro Azevedo Santos Universidade Federal Rural do Rio de Janeiro
  • Sonia Regina de Souza Universidade Federal Rural do Rio de Janeiro
  • Manlio Silvestre Fernandes Universidade Federal Rural do Rio de Janeiro

DOI:

https://doi.org/10.5433/1679-0359.2014v35n6p2991

Palavras-chave:

Zea mays L, Nitrate, Ammonium, Amino-N, Soluble sugars.

Resumo

The analysis of ion uptake kinetics is the key experimental procedure for determining the uptake efficiency of different species and varieties. The principal goal of this study was to evaluate phosphorus (P) uptake and its effect on nitrogen (N) metabolism in two maize varieties (Sol da Manhã and Eldorado) and one improved maize cultivar (AG 122®) exposed to a resupply of 10 or 100 ?M of P following a period of P deprivation. The experiment was based on a completely randomized design with four replicates, with treatments arranged in a 3x2 factorial scheme consisting of three genotypes and two P doses. The treatments were applied at 16 days after germination (DAG), and samples of nutrient solution were collected over time to estimate the kinetics of P uptake (Vmax, KM and Cmin). At the end of the experiment, a portion of the total fresh weight was stored to determine N fractions and soluble sugars. Under the experimental conditions, the AG 122® cultivar showed the lowest KM and Cmin values for both P doses, indicating a higher uptake efficiency for these plants. In contrast, the Eldorado and Sol da Manhã varieties showed the highest Vmax values. An absence of P from the nutrient solution for one day, followed by the addition of 10 ?M of P for the same period, did not result in alterations in N metabolism in any of the genotypes. However, it was observed that the Sol da Manhã and Eldorado varieties concentrated their NO3--N metabolism in their roots, whereas the AG 122® cultivar concentrated its NO3--N metabolism in its shoots.

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Biografia do Autor

Leandro Martins Ferreira, Universidade Federal Rural do Rio de Janeiro

Engº Agro, Discente do Curso de Doutorado em Ciência do Solo, CPGA-CS, Universidade Federal Rural do Rio de Janeiro, UFRRJ, Seropédica, RJ.

Rafael Passos Rangel, Universidade Federal Rural do Rio de Janeiro

Engº Agro, Discente do Curso de Mestrado em Agronomia, CPGA-CS, UFRRJ, Seropédica, RJ.

Orlando Carlos Huertas Tavares, Universidade Federal Rural do Rio de Janeiro

Engº Agro, Discente do Curso de Doutorado em Agronomia, CPGF, UFRRJ, Seropédica, RJ.

Leandro Azevedo Santos, Universidade Federal Rural do Rio de Janeiro

Engº Agrº, Prof. Adjunto II, Deptº de Solos, UFRRJ, Seropédica, RJ.

Sonia Regina de Souza, Universidade Federal Rural do Rio de Janeiro

Engª Agrª, Profª Associada IV, Deptº de Química, UFRRJ, Seropédica, RJ.

Manlio Silvestre Fernandes, Universidade Federal Rural do Rio de Janeiro

Engº Agrº, Prof. Emérito, Deptº de Solos, UFRRJ, Seropédica, RJ.

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Publicado

2014-12-09

Como Citar

Ferreira, L. M., Rangel, R. P., Tavares, O. C. H., Santos, L. A., Souza, S. R. de, & Fernandes, M. S. (2014). Phosphorus uptake kinetics and nitrogen fractions in maize grown in nutrient solutions. Semina: Ciências Agrárias, 35(6), 2991–3002. https://doi.org/10.5433/1679-0359.2014v35n6p2991

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