Nitrogen fertilization in the contents of secondary compounds in cassava cultivars

Authors

  • Diego Gazola Universidade Estadual de Londrina
  • Claudemir Zucareli Universidade Estadual de Londrina
  • Rudiney Ringenberg Empresa Brasileira de Pesquisa Agropecuária
  • José Perez da Graça Empresa Brasileira de Pesquisa Agropecuária
  • Clara Beatriz Hoffmann-Campo Empresa Brasileira de Pesquisa Agropecuária

DOI:

https://doi.org/10.5433/1679-0359.2018v39n3p1015

Keywords:

Caffeic acid, P-coumaric acid, Ferulic acid, Defensive compounds, Manihot esculenta, Rutin.

Abstract

The production of chemical substances is a strategy of plants to defend against the attack of pest insects. The synthesis of secondary compounds in plants is influenced by genotype and cultural management, such as the use of nitrogen fertilizers. Thus, the objective of this work is to evaluate the effect of doses of nitrogen fertilizer over time on the production of secondary compounds in two industrial cassava cultivars. The experiment was carried out in a greenhouse (25 ± 5 °C) of Embrapa Soybean in Londrina, Paraná, with the cultivation of potted plants (4l) in a 2 × 4 × 3 factorial scheme, with five replications. Two genotypes of industrial cassava (‘Baianinha’ and ‘Caiuá’) and four different nitrogen doses (0, 30, 60, and 90 kg ha-1) were used, with sampling at 15, 30, and 45 d after fertilization. Nitrogen fertilization was performed 50 d after sprouting. In the apical leaves, the levels of rutin, caffeic, p-coumaric and ferulic acids were evaluated in a high performance liquid chromatograph (HPLC). Exploratory analyses were performed on the data variables to verify the assumptions for analysis of variance (ANOVA), such as the independence and normality of errors, homogeneity of treatment variances and non-additivity of the model (they were submitted to analysis of homogeneity and normality, respectively. After these tests, ANOVA and Tukey’s test (p ? 0.05) were performed. For the quantitative data concerning the N rates, regression study analyzes were performed. The Caiuá cultivar was found to have a higher ferulic acid content. The caffeic acid content decreased over time after the application of N in both cultivars. The rutin content in both cultivars did not increase with an increase in nitrogen dose. At a dose of 90 kg ha-1, both cultivars presented a lower p-coumaric acid content after 30 d.

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Author Biographies

Diego Gazola, Universidade Estadual de Londrina

Dr. em Agronomia, Universidade Estadual de Londrina, UEL, Londrina, PR, Brasil.

Claudemir Zucareli, Universidade Estadual de Londrina

Prof. Dr., Adjunto, Centro de Ciências Agrárias, UEL, Londrina, PR, Brasil.

Rudiney Ringenberg, Empresa Brasileira de Pesquisa Agropecuária

Pesquisador, Empresa Brasileira de Pesquisa Agropecuária, EMBRAPA Soja, Londrina, PR, Brasil.

José Perez da Graça, Empresa Brasileira de Pesquisa Agropecuária

Pós-Doutorando, Empresa Brasileira de Pesquisa Agropecuária, EMBRAPA Soja, Londrina, PR, Brasil.

Clara Beatriz Hoffmann-Campo, Empresa Brasileira de Pesquisa Agropecuária

Pesquisadora, Empresa Brasileira de Pesquisa Agropecuária, EMBRAPA Soja, Londrina, PR, Brasil.

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Published

2018-05-04

How to Cite

Gazola, D., Zucareli, C., Ringenberg, R., Graça, J. P. da, & Hoffmann-Campo, C. B. (2018). Nitrogen fertilization in the contents of secondary compounds in cassava cultivars. Semina: Ciências Agrárias, 39(3), 1015–1028. https://doi.org/10.5433/1679-0359.2018v39n3p1015

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