African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12277

Full Length Research Paper

Bioactivity of mangrove humic materials on Rizophora mangle and Laguncularia racemosa seedlings, Brazil

Leonardo Barros Dobbss
  • Leonardo Barros Dobbss
  • Instituto de Ciências Agrárias (ICA) da Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM). Avenida Vereador João Narciso, Unaí, Minas Gerais, CEP: 38610-000 Brasil.
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André Luiz Paier Barroso
  • André Luiz Paier Barroso
  • Universidade Vila Velha (UVV), Complexo Biopráticas. Rua Mercúrio, s/n, Boa Vista 1, Vila Velha, Espírito Santo, CEP: 29102-623 Brasil.
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Alessandro Coutinho Ramos4
  • Alessandro Coutinho Ramos4
  • Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF) Av. Alberto Lamego 2000, Horto, Campos dos Goytacazes, Rio de Janeiro, CEP: 28013-602 Brasil.
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Karla Stéphanie Nunes Torrico
  • Karla Stéphanie Nunes Torrico
  • Universidade Vila Velha (UVV), Complexo Biopráticas. Rua Mercúrio, s/n, Boa Vista 1, Vila Velha, Espírito Santo, CEP: 29102-623 Brasil.
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Fabíola Schunk de Souza Arçari
  • Fabíola Schunk de Souza Arçari
  • Universidade Vila Velha (UVV), Complexo Biopráticas. Rua Mercúrio, s/n, Boa Vista 1, Vila Velha, Espírito Santo, CEP: 29102-623 Brasil.
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Daniel Basílio Zandonadi
  • Daniel Basílio Zandonadi
  • Embrapa Hortaliças (CNPH) Parque Estação Biológica - PqEB s/n°. Brasília, Distrito Federal, CEP: 70770-901 Brasil.
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  •  Received: 20 November 2015
  •  Accepted: 13 May 2016
  •  Published: 08 June 2016

Abstract

The mangrove sediments are rich in organic matter and humic substances, responsible for important functions such as reducing the toxicity of heavy metals, nutrient stabilization, serving as drain to atmospheric carbon and increasing the plant growth. In this study, we observed the effect of humic substances, humic acids and fulvic acids isolated from sediments of a mangrove forest, sampled from the Municipal Ecological Station Ilha do Lameirão (EEMIL, located in Vitória, Espírito Santo State, Brazil), on the growth and root acidification of Rizophora mangle and Laguncularia racemosa seedlings. For this, R. mangle and L. racemosa propagules were transferred to pots and then treated with different humic materials. The evaluation in root architecture change was performed by analyzing the main root axis length, lateral root length, density of lateral roots, fresh and dry mass weight of roots and estimated H+-ATPase activity by specific root acidification measurement. The results indicate that all humic materials extracted from mangrove organic matter were able to modify the root architecture systems of the studied plants. In addition to inducing an increase in the number of lateral roots and root branching, it also stimulated specific root acidification when compared to control groups. There is a good potential in developing technologies for the production of seedlings of mangrove plant species treated with biostimulants based in humic materials isolated from the mangrove ecosystem itself.

Key words: Humic substances, humic acids, fulvic acids, mangrove.

Abbreviation

EEMIL, Estação  Ecológica  Municipal  Ilha  do  Lameirão (Municipal Ecological Station Ilha do Lameirão); HS, humic substances; HA, humic acids; FA, fulvic acids.