Journal of Soils and Sediments

, Volume 16, Issue 3, pp 785–800 | Cite as

Phytotoxicity of natural soils using physiological and biochemical endpoints reveals confounding factors: can a weight of evidence tackle uncertainty?

  • Sara C. Antunes
  • Bruno B. Castro
  • Maria Celeste Dias
  • José Moutinho-Pereira
  • Carlos M. Correia
  • Maria T. Claro
  • Ana Gavina
  • Conceição Santos
  • Fernando Gonçalves
  • Glória Pinto
Soils, Sec 1 • Soil Organic Matter Dynamics and Nutrient Cycling • Research Article
  • 185 Downloads

Abstract

Purpose

Standard assays for phytotoxicity provide a reductionist view on the performance of plants under toxic stress. To address two of the most prominent issues in plant toxicity studies, our aims were (1) to assess how well physiological and biochemical parameters complement standard toxicological endpoints when testing natural soils and (2) to assess the suitability of three commonly used control soils as comparative references.

Material and methods

We compared the performance of Zea mays and Helianthus annuus in three control soils (artificial Organisation for Economic Co-operation and Development (OECD) soil, standard LUFA 2.2 soil, and turf-perlite) against three natural soils representing a gradient of contamination (from a deactivated uranium mine). Standard endpoints (emergence and biomass) were estimated, along with pigment content, photosynthetic parameters, cellular injury, and proline content.

Results and discussion

The toxicological profile of natural soils was highly dependent on the control soil used as reference; also, plant physiological performance was influenced by the soils’ properties. We discuss the need to interpret and combine multiple lines of evidence as a way to increase the degree of confidence one classifies soils based on their ecotoxicity, and this is where the integration of physiological and biochemical parameters bring added value.

Conclusions

When facing large variability in soil characteristics, it is best to collect and integrate as much information possible to strengthen conclusions about phytotoxicity of natural soils. Obviously, this refutes reductionist views and places the final conclusion in the hands of expert judgment.

Keywords

Natural and standard soils Physiological performance Plant bioassays Standard protocols 

Notes

Acknowledgments

This work was supported by European Funds through COMPETE and by National Funds through the Portuguese Science Foundation (FCT) within project PEst-C/MAR/LA0017/2013 and UID/AMB/50017/2013. Maria Celeste Dias and Glória Pinto were supported by FCT by means of a post-doctoral grant (SFRH/BPD/100865/2014 and SFRH/BPD/101669/2014, respectively).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Sara C. Antunes
    • 1
    • 2
  • Bruno B. Castro
    • 2
    • 3
  • Maria Celeste Dias
    • 4
  • José Moutinho-Pereira
    • 5
  • Carlos M. Correia
    • 5
  • Maria T. Claro
    • 3
  • Ana Gavina
    • 1
    • 6
  • Conceição Santos
    • 1
    • 7
  • Fernando Gonçalves
    • 2
    • 3
  • Glória Pinto
    • 2
    • 3
  1. 1.Departamento de Biologia da Faculdade de Ciências da Universidade do PortoPortoPortugal
  2. 2.Centro de Estudos do Ambiente e do Mar (CESAM)Universidade de AveiroAveiroPortugal
  3. 3.Departamento de BiologiaUniversidade de AveiroAveiroPortugal
  4. 4.Centro de Ecologia Funcional (CEF), Departamento de Ciências da VidaFaculdade de Ciências e Tecnologia da Universidade de CoimbraCoimbraPortugal
  5. 5.Centro de Investigação e de Tecnologias Agroambientais e Biológicas (CITAB), Department Biologia e AmbienteUniversidade de Trás-os-Montes e Alto DouroVila RealPortugal
  6. 6.Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR)PortoPortugal
  7. 7.GreenUP, CITAB-UPFaculdade de Ciências da Universidade do PortoPortoPortugal

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