RT Journal Article
T1 Effect of Oxytetracycline and Chlortetracycline on bacterial community growth in agricultural soils
A1 Santas Miguel, Vanesa
A1 Arias Estévez, Manuel
A1 Díaz Raviña, Montserrat
A1 Fernández Sanjurjo, María José
A1 Álvarez Rodríguez, Esperanza
A1 Núñez Delgado, Avelino
A1 Fernández Calviño, David
K1 2511.04 Química de Suelos
K1 3108.01 Bacterias
K1 3209 Farmacología
AB Toxicity on soil bacterial community growth caused by the antibiotics oxytetracycline (OTC) and chlortetracycline (CTC) was studied in 22 agricultural soils after 1, 8 and 42 incubation days. The leucine incorporation method was used with this aim, estimating the concentration of each antibiotic which caused an inhibition of 50% in bacterial community growth (log IC50). For OTC, the mean log IC50 was 2.70, 2.81, 2.84 for each of the three incubation times, while the values were 2.05, 2.22 and 2.47 for CTC, meaning that the magnitude of OTC toxicity was similar over time, whereas it decreased significantly for CTC with incubation time. In addition, results showed that the toxicity on bacterial community growth due to CTC is significantly higher than when due to OTC. Moreover, the toxicity on bacterial community growth due to both antibiotics is dependent on soil properties. Specifically, an increase in soil pH and silt content resulted in higher toxicity of both antibiotics, while increases in total organic carbon and clay contents caused decreases in OTC and CTC toxicities. The results also show that OTC toxicity can be well predicted by means of specific equations, using the values of pH measured in KCl and those of effective cation exchange capacity as input variables. CTC toxicity may be predicted (but with low precision) using pH measured in KCl and total organic carbon. These equations may help to predict the negative effects caused by OTC and CTC on soil bacteria using easily measurable soil parameters.
PB Agronomy
SN 20734395
YR 2020
FD 2020-07-14
LK http://hdl.handle.net/11093/1732
UL http://hdl.handle.net/11093/1732
LA eng
NO Agronomy, 10(7): 1011 (2020)
NO University of Vigo | Ref. no number available
DS Investigo
RD 23-ene-2025