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Bacterial pollution induced community tolerance (PICT) to Cu and interactions with pH in long-term polluted vineyard soils

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Author

  • David Fernandez-Calvino
  • Manuel Arias-Estevez
  • Montserrat Diaz-Ravina
  • Erland Bååth

Summary, in English

Pollution induced community tolerance (PICT) has been suggested as an end-point measurement less affected by confounding environmental factors compared to standard methods of microbial growth, activity and community composition. We evaluated the use of PICT to determine Cu toxicity in vineyard soils polluted with Cu based fungicides (25-1120 mg Cu kg(-1)). These soils also varied in pH (4.3-7.3), organic C (0.31-6.91%) and texture (14-56% silt). PICT was estimated as bacterial community tolerance to Cu measured by the [H-3]leucine incorporation method. Bacterial tolerance to Cu increased 9 times in the most polluted compared to the unpolluted soils. Cu tolerance was also affected to a minor degree by pH, organic C and soil texture. Lower bacterial tolerance was found in soils with high pH and organic C, probably due to Cu becoming less bioavailable in soils with high pH and organic C content. The silt content appeared to increase bacterial tolerance, probably due to fine soil particles decreasing Cu bioavailability during the PICT detection phase. Despite the effects of other environmental factors, the main determinant of increased bacterial community tolerance to Cu was the pollution level. PICT measured with the leucine incorporation technique thus appears to be a sensitive and stable concept to evaluate toxic impacts, unless soils with very different pH, organic C or texture are studied. (C) 2011 Elsevier Ltd. All rights reserved.

Publishing year

2011

Language

English

Pages

2324-2331

Publication/Series

Soil Biology & Biochemistry

Volume

43

Issue

11

Document type

Journal article

Publisher

Elsevier

Topic

  • Biological Sciences

Keywords

  • Cu pollution
  • PICT
  • Bacterial growth
  • Fungal growth

Status

Published

Research group

  • Microbial Ecology

ISBN/ISSN/Other

  • ISSN: 0038-0717