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

In English

Författare

  • 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.

Publiceringsår

2011

Språk

Engelska

Sidor

2324-2331

Publikation/Tidskrift/Serie

Soil Biology & Biochemistry

Volym

43

Issue

11

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Biological Sciences

Nyckelord

  • Cu pollution
  • PICT
  • Bacterial growth
  • Fungal growth

Status

Published

Forskningsgrupp

  • Microbial Ecology

ISBN/ISSN/Övrigt

  • ISSN: 0038-0717