The influence of microbial communities for triadimefon enantiomerization in soils with different pH values

Abstract

Enantiomers of chiral molecules can undergo interconversion leading to markedly different toxicities, which can introduce significant uncertainty when evaluating biological and environmental fates. However, enantiomerization (the reversible conversion of one enantiomer into the other) related to soil microorganism is rarely understood. For better understanding, S-triadimefon and R-triadimefon enantiopure were incubated in different soils with different pH value. Both high-performance liquid chromatography and high-throughput sequencing technology were used to explore target analytes quantitatively and microbial taxa related to the conversion process. Results revealed a significant enantiomerization among the soils. The alkaline soil from Beijing had a faster conversion than neutral soil from Changchun, while acidic soil from Wuhan had no conversion. At the same results, analysis of bacteria community showed higher abundance of Arthrobacter and Halomonas genus in alkaline soil than neutral soil after treatments, but the acidic soil was lower. Moreover, Arthrobacter and Halomonas were responsible for converting S-triadimefon to R-triadimefon and R-triadimefon to S-triadimefon in alkaline and neutral soil, respectively. Thus, these genera may be one of the reasons to explain the enantiomerization in different soils observed in this study. Thus, research at microbial level is necessary for efficient ecological risk assessment of chiral fungicide.

Triadimefon in aquatic environments: occurrence, fate, toxicity, and ecological risk

“…By contrasting the result of sterilized soil and non-sterilized soil, the degradation of triadimefon in soil was mainly biologically mediated. The microorganisms Arthrobacter and Halomonas played important roles in converting R-TDF to S-TDF and S-TDF to R-TDF in neutral and alkaline soil, respectively [45]. Thus, triadimefon would not persist very long in soil, with observed half-lives of 8 days in sandy-loam and 13 days in clay soils [46], 5.2 days in facility soil [47] and finally 39.4 days in sterilized soil [45].…”

Triadimefon in Aquatic Environments: Occurrence, Fate, Toxicity and Risk

“…By contrasting the result of sterilized soil and non-sterilized soil, the degradation of triadimefon in soil was mainly biologically-mediated. The microorganisms Arthrobacter and Halomonas played important roles in converting R-TDF to S-TDF and S-TDF to R-TDF in neutral and alkaline soil, respectively [45]. Thus, triadimefon would not persist very long in soil, with observed halflives of 8 days in sandy-loam and 13 days in clay soils [46], 5.2 days in facility soil [47] and nally 39.4 days in sterilized soil [45].…”

“…The microorganisms Arthrobacter and Halomonas played important roles in converting R-TDF to S-TDF and S-TDF to R-TDF in neutral and alkaline soil, respectively [45]. Thus, triadimefon would not persist very long in soil, with observed halflives of 8 days in sandy-loam and 13 days in clay soils [46], 5.2 days in facility soil [47] and nally 39.4 days in sterilized soil [45]. But, triadimenol, the degradation product of triadimefon, is much more persistent, with a half-life exceeding 240 days [33,44,48].…”

Relationship between enantioselective transformation of racemic quizalofop‐ethyl and soil bacterial diversity: A destructive approach

“…Enantioselective transformation of chiral pesticides in agricultural soil has been widely reported . The enantioselectivity and enantiomerization occurs mostly during biotransformation processes, which reflects the different interactions of enantiomers with microorganisms or enzymes . Enantioselective transformation can be influenced by large‐scale environmental changes or changes in soil microenvironments such as the introduction of nutrients or pesticides .…”

“…6 The enantioselectivity and enantiomerization occurs mostly during biotransformation processes, which reflects the different interactions of enantiomers with microorganisms or enzymes. [7][8][9][10] Enantioselective transformation can be influenced by large-scale environmental changes 4 or changes in soil microenvironments such as the introduction of nutrients or pesticides. [11][12][13][14] These fluctuations in enantioselective transformation were caused by a change in soil microorganisms.…”