Decreased abundance and diversity of culturable Pseudomonas spp. populations with increasing copper exposure in the sugar beet rhizosphere

FEMS Microbiology Ecology
Kristian K BrandtOle Nybroe

Abstract

Recent studies have indicated that culturable bacteria constitute highly sensitive bioindicators of metal-induced stress in soil. We report the impact of different copper exposure levels characteristic of contaminated agricultural soils on culturable Pseudomonas spp. in the rhizosphere of sugar beet. We observed that the abundance of Pseudomonas spp. was much more severely affected than that of the general population of culturable heterotrophic bacteria by copper. For diversity assessment, Pseudomonas isolates were divided into operational taxonomic units based on amplified ribosomal DNA restriction analysis and genomic PCR fingerprinting by universally primed PCR. Copper significantly decreased the diversity of Pseudomonas spp. in the rhizosphere and significantly increased the frequency of copper-resistant isolates. Concomitant chemical and biological analysis of copper in the rhizosphere and in bulk soil extracts indicated no rhizosphere effect and a relatively low copper bioavailability in the studied soil, suggesting that the observed effects of copper may occur at lower total concentrations in other soils. We conclude that culturable Pseudomonas sensu stricto constitutes a highly sensitive and relevant bioindicator group ...Continue Reading

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Citations

Sep 6, 2011·Applied and Environmental Microbiology·Elina LaantoJaana K H Bamford
Mar 8, 2014·International Journal of Food Microbiology·Guilherme MartinsIsabelle Masneuf-Pomarède
Jul 20, 2012·International Journal of Food Microbiology·Guilherme MartinsIsabelle Masneuf-Pomarède
Dec 1, 2009·International Journal of Systematic and Evolutionary Microbiology·Niels O G JørgensenMichael Hansen
Jul 17, 2009·International Journal of Systematic and Evolutionary Microbiology·Niels O G JørgensenMichael Hansen
Nov 15, 2013·FEMS Microbiology Ecology·Fabio MascherYvan Moënne-Loccoz
Dec 21, 2007·FEMS Microbiology Ecology·Anna LazzaroBeat Frey
Jul 6, 2016·Environmental Pollution·Jakub J ModrzyńskiKristian K Brandt
Oct 21, 2015·Antimicrobial Agents and Chemotherapy·Dereje Dadi GudetaLuca Guardabassi
Jun 28, 2019·International Journal of Phytoremediation·Khadeeja RehmanMuhammad Afzal
May 18, 2007·Molecular Plant-microbe Interactions : MPMI·Xue-Xian Zhang, Paul B Rainey

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