Plant acquisition and metabolism of the synthetic nitrification inhibitor dicyandiamide and naturally-occurring guanidine from agricultural soils

Karina A. Marsden; Matthew Scowen; Paul W. Hill; Davey L. Jones; David R. Chadwick

doi:10.1007/s11104-015-2549-7

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Plant acquisition and metabolism of the synthetic nitrification inhibitor dicyandiamide and naturally-occurring guanidine from agricultural soils

Journal article

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Plant acquisition and metabolism of the synthetic nitrification inhibitor dicyandiamide and naturally-occurring guanidine from agricultural soils

Karina A. Marsden, Matthew Scowen, Paul W. Hill, Davey L. Jones and David R. Chadwick

Plant and soil, Vol.395(1-2), pp.201-214

2015

DOI: https://doi.org/10.1007/s11104-015-2549-7

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Abstract

Agriculture

Agronomy

Life Sciences & Biomedicine

Plant Sciences

Science & Technology

Soil Science

Background and aims There is increasing interest and use of nitrification inhibitors (NI) in agroecosystems, yet little is known of their fate in planta. Residues of the organic, N-rich NI, dicyandiamide (DCD), have been found in milk products following commercial application to pasture. We investigated whether plant acquisition and metabolism of DCD were consistent with plant-mediated transmission from soil to agricultural food products. Methods Uptake rates, translocation to the shoot, degradation of the label within wheat tissue and availability within two soils of DCD and the structurally similar naturally occurring N-rich molecule, guanidine, were measured using 14C labelling. Results Under sterile conditions, over 2 h wheat took up (34 and 14 μmol g−1 root DW h−1 at 1 mM: DCD and guanidine, respectively), translocated (7–15 and 19–22 %) and metabolised (0.4 and 0.9 % of uptake) DCD- and guanidine-14C. Both molecules were also acquired from soil by wheat despite concurrent soil sorption and microbial uptake. Conclusions Both DCD and guanidine can be acquired and metabolised by graminaceous plants. Although probably not a significant route of N acquisition, plant uptake provides a direct route of DCD entry into the food chain.

Details

Title: Plant acquisition and metabolism of the synthetic nitrification inhibitor dicyandiamide and naturally-occurring guanidine from agricultural soils
Authors/Creators: Karina A. Marsden - Bangor University
Matthew Scowen - Bangor University
Paul W. Hill - Bangor University
Davey L. Jones - Bangor University
David R. Chadwick - Bangor University
Publication Details: Plant and soil, Vol.395(1-2), pp.201-214
Publisher: Springer Nature
Number of pages: 14
Grant note: NE/IO12303/1 / UK Natural Environment Research Council; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC) EU Knowledge Economy Skills Scholarship
Identifiers: 991005560434807891
Copyright: © The Author(s) 2015.
Murdoch Affiliation: Centre for Sustainable Farming Systems
Language: English
Resource Type: Journal article

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Citation topics: 3 Agriculture, Environment & Ecology; 3.45 Soil Science; 3.45.397 Nitrogen Management
Web Of Science research areas: Agronomy; Plant Sciences; Soil Science
ESI research areas: Agricultural Sciences