Comparative Toxicities of Salts on Microbial Processes in Soil

Applied and Environmental Microbiology
Kristin M RathJohannes Rousk

Abstract

Soil salinization is a growing threat to global agriculture and carbon sequestration, but to date it remains unclear how microbial processes will respond. We studied the acute response to salt exposure of a range of anabolic and catabolic microbial processes, including bacterial (leucine incorporation) and fungal (acetate incorporation into ergosterol) growth rates, respiration, and gross N mineralization and nitrification rates. To distinguish effects of specific ions from those of overall ionic strength, we compared the addition of four salts frequently associated with soil salinization (NaCl, KCl, Na2SO4, and K2SO4) to a nonsaline soil. To compare the tolerance of different microbial processes to salt and to interrelate the toxicity of different salts, concentration-response relationships were established. Growth-based measurements revealed that fungi were more resistant to salt exposure than bacteria. Effects by salt on C and N mineralization were indistinguishable, and in contrast to previous studies, nitrification was not found to be more sensitive to salt exposure than other microbial processes. The ion-specific toxicity of certain salts could be observed only for respiration, which was less inhibited by salts containing...Continue Reading

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Citations

Mar 4, 2017·Analytical Chemistry·Ronghua KangPeter Dörsch
Aug 8, 2018·Scientific Reports·Ana Roberta Lima MirandaAdemir Sergio Ferreira de Araujo
Oct 4, 2019·Microbiology·Joanne Chee-SanfordRobert Sanford
Sep 6, 2020·The Science of the Total Environment·Chenchen WeiMeitao Zhang
Dec 12, 2020·Nature Communications·Monique S PatznerCasey Bryce
Dec 6, 2016·The Science of the Total Environment·A Mark IbekweDonald L Suarez
Jun 6, 2020·The Science of the Total Environment·Loubna BenidireWafa Achouak
Nov 23, 2021·Ecology·Lettice C HicksJohannes Rousk

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