Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2755

Full Length Research Paper

The role of iron on the growth and development of the seedlings of Rhizophora mangle L.

Barcelos Ully Depolo
  • Barcelos Ully Depolo
  • Department of Oceanography and Ecology, Federal University of Espirito Santo, Brazil.
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Andreia Barcelos Passos Lima Gontijo
  • Andreia Barcelos Passos Lima Gontijo
  • Department of Agrarian and Biological Sciences, Federal University of Espírito Santo, São Mateus, ES, Brazil.
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Adriano Alves Fernandes
  • Adriano Alves Fernandes
  • Department of Agrarian and Biological Sciences, Federal University of Espírito Santo, São Mateus, ES, Brazil.
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Antelmo Ralph Falqueto
  • Antelmo Ralph Falqueto
  • Department of Agrarian and Biological Sciences, Federal University of Espírito Santo, São Mateus, ES, Brazil.
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Sávia Soares Pascoalini
  • Sávia Soares Pascoalini
  • Espírito Santense Technology Foundation (FEST), Federal University of Espírito Santo, Vitória, ES, Brazil.
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Dielle Meire de Santana Lopes
  • Dielle Meire de Santana Lopes
  • Espírito Santense Technology Foundation (FEST), Federal University of Espírito Santo, Vitória, ES, Brazil.
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Edilson Romais Schmildt
  • Edilson Romais Schmildt
  • Department of Agrarian and Biological Sciences, Federal University of Espírito Santo, São Mateus, ES, Brazil.
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Samira Leite
  • Samira Leite
  • Espírito Santense Technology Foundation (FEST), Federal University of Espírito Santo, Vitória, ES, Brazil.
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Mônica Maria Pereira Tognella
  • Mônica Maria Pereira Tognella
  • Department of Oceanography and Ecology, Federal University of Espirito Santo, Brazil.
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  •  Received: 10 May 2022
  •  Accepted: 07 July 2022
  •  Published: 31 July 2022

Abstract

Iron is an essential element, and its deficiency and excess result in negative effects on the growth and physiology of plants. Heavy metals are the highest anthropic pollutants that affect mangrove ecosystem. This study aimed to analyze the development of Rhizophora mangle seedlings in response to excess Fe under controlled conditions. Seedlings of R. mangle previously established were transferred to the culture substrate containing 45 (Control), 135, 225, 270, and 315 µmol L-1 of Fe. The propagules were cultivated for 270 days and during this period the epicotyl length and leaf production were evaluated. At the end of the experiment, the epicotyl length, growth rate, and gas exchange of the seedlings were calculated in the different treatments and the quantification of Fe in the aerial part and root of the seedlings were performed. The excess of Fe led to lower incorporation of biomass, mainly affecting leaf production in the treatment with 315 µmol L-1. A reduction was observed in the assimilation of carbon, also a reduction in stomatal conductance in the highest concentrations of the metal. The excess of Fe in the cultivation solution increased its concentration in the seedlings biomass, with the roots being principally responsible for the bioaccumulation. Although R. mangle plants showed clear signs of stress to excess Fe, they also have a strong capacity for bioaccumulation and tolerance.

Key words: Trace metal, mangrove, toxicity, bioaccumulation.