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Multi-omic and physiologic approach to understand Lotus japonicus response upon exposure to 3,4 dimethylpyrazole phosphate nitrification inhibitor.
Science of the Total Environment 2019 April 11
Nitrogen fertilization is a major force in global greenhouse gases emissions and causes environmental contamination through nitrate leaching. The use of nitrification inhibitors has been proven successful to mitigate these effects. However, there is an increasing concern about the undesired effects that their potential persistence in the soil or accumulation in plants may provoke. In this study, we first exposed Lotus japonicus plants to high amounts of 3,4 dimethylpyrazole phosphate (DMPP) and 2-(N-3,4-dimethyl-1H-pyrazol-1-yl) succinic acid isomeric mixture (DMPSA) nitrification inhibitors. Exposure to doses higher than 1 mg·L-1 provoked DMPP accumulation mostly in the aerial part, while DMPSA was only detected from 10 mg·L-1 and nearly no translocation. To evaluate the effect that DMPP accumulation in leaves may provoke on plant performance we combined a transcriptome, proteome, and physiological analysis in plants treated with 10 mg/ L of DMPP. This treatment provoked changes in the expression of 229 genes and 59 proteins. Overall, we evidence that when DMPP accumulates in leaves it induces stress responses, notably provoking changes in cell redox balance, hormone signaling, protein synthesis and turnover and carbon and nitrogen metabolism.
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