Soil bacteria and protists show different sensitivity to polycyclic aromatic hydrocarbons at controlled chemical activity
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Soil bacteria and protists show different sensitivity to polycyclic aromatic hydrocarbons at controlled chemical activity. / Winding, Anne; Modrzyński, Jakub J; Christensen, Jan H; Brandt, Kristian K; Mayer, Philipp.
In: FEMS Microbiology Letters, Vol. 366, No. 17, fnz214, 2019.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Soil bacteria and protists show different sensitivity to polycyclic aromatic hydrocarbons at controlled chemical activity
AU - Winding, Anne
AU - Modrzyński, Jakub J
AU - Christensen, Jan H
AU - Brandt, Kristian K
AU - Mayer, Philipp
PY - 2019
Y1 - 2019
N2 - This study linked growth inhibition of soil bacteria and protists to the chemical activity (a) of polycyclic aromatic hydrocarbons (PAHs) and compared the sensitivities of bacteria and protists. Passive dosing from pre-loaded silicone provided well defined and constant a of PAHs in independent tests. Single-species growth inhibition with two bacterial (Pseuodomonas fluorescens DR54 and Sinorhizobium meliloti) and two protist (Cercomonas longicauda and Acanthamoeba castellanii) strains at maximum a (amax) of nine and four PAHs, respectively, showed no inhibition of PAHs with amax below 0.1 (pyrene and anthracene), while growth inhibition was observed for PAHs with amax above 0.1 (e.g. fluorene, fluoranthene, naphthalene). The bacteria were less sensitive than the protists. Soil bacterial community-level growth inhibition by naphthalene was in good agreement with single-species data, but also indicated the presence of sensitive bacteria that were inhibited by a below 0.05 and increasing pre-exposure time giving higher inhibition. The a of 50% inhibition (Ea50) was 0.434 and 0.329 for 0.5 and 4 h pre-exposure time, respectively. Invertebrates tended to be more sensitive than single-celled organisms tested here. This suggests that PAH exposure leads to differential toxicity in e.g. soil biota, which may affect soil food web structure and cycling of organic matter.
AB - This study linked growth inhibition of soil bacteria and protists to the chemical activity (a) of polycyclic aromatic hydrocarbons (PAHs) and compared the sensitivities of bacteria and protists. Passive dosing from pre-loaded silicone provided well defined and constant a of PAHs in independent tests. Single-species growth inhibition with two bacterial (Pseuodomonas fluorescens DR54 and Sinorhizobium meliloti) and two protist (Cercomonas longicauda and Acanthamoeba castellanii) strains at maximum a (amax) of nine and four PAHs, respectively, showed no inhibition of PAHs with amax below 0.1 (pyrene and anthracene), while growth inhibition was observed for PAHs with amax above 0.1 (e.g. fluorene, fluoranthene, naphthalene). The bacteria were less sensitive than the protists. Soil bacterial community-level growth inhibition by naphthalene was in good agreement with single-species data, but also indicated the presence of sensitive bacteria that were inhibited by a below 0.05 and increasing pre-exposure time giving higher inhibition. The a of 50% inhibition (Ea50) was 0.434 and 0.329 for 0.5 and 4 h pre-exposure time, respectively. Invertebrates tended to be more sensitive than single-celled organisms tested here. This suggests that PAH exposure leads to differential toxicity in e.g. soil biota, which may affect soil food web structure and cycling of organic matter.
U2 - 10.1093/femsle/fnz214
DO - 10.1093/femsle/fnz214
M3 - Journal article
C2 - 31598655
VL - 366
JO - F E M S Microbiology Letters
JF - F E M S Microbiology Letters
SN - 0378-1097
IS - 17
M1 - fnz214
ER -
ID: 228728182