Determining the fate of selenium in wheat biofortification: an isotopically labelled field trial study

A - Papers appearing in refereed journals

Mathers, A. W., Young, S. D., McGrath, S. P., Zhao, F-J., Crout, N. M. J. and Bailey, E. H. 2017. Determining the fate of selenium in wheat biofortification: an isotopically labelled field trial study. Plant and Soil. 420 (1-2), pp. 61-77.

AuthorsMathers, A. W., Young, S. D., McGrath, S. P., Zhao, F-J., Crout, N. M. J. and Bailey, E. H.
Abstract

Aims The principal aim of this research was to quantify
retention of a single, realistic Se biofortification application (10 g ha−1) in contrasting soils over two growing
seasons utilizing an enriched stable Se isotope (77Se) to
discriminate between applied Se and native soil Se.
Methods Isotopically enriched 77Se (Na2SeO4) was applied (10 g ha−1) to four replicate plots (2 m × 2 m) of
winter wheat, on three contrasting soils on the University of Nottingham farm (UK), at early stem extension in
May 2012. Labelled 77Se was assayed in soil and crop
fractions by ICP-MS.
Results Topsoil retained a proportion of applied Se at
harvest (c. 15 – 31%) with only minor retention in
subsoil (2-4%), although losses were 37 – 43%. Further
analysis of topsoil 77Se, the following spring, and at
second harvest, suggested that labelled Se retained in
soil was fixed and uptake by a following crop was
negligible.
Conclusions Prolonged biofortification leads to accumulation of Se in soil but the retained Se has very low
bioavailability and mobility. The time required to double
the soil Se content would be about 500 years. However,
reincorporation of cereal straw could provide a residual
source of Se for a following crop, depending on timing
and management.

KeywordsSelenium; Biofortification; Wheat; Enriched stable isotope; Se fixation in soil; Straw
Year of Publication2017
JournalPlant and Soil
Journal citation420 (1-2), pp. 61-77
Digital Object Identifier (DOI)doi:10.1007/s11104-017-3374-y
Open accessPublished as green open access
FunderLawes Agricultural Trust (LAT)
Publisher's version
Output statusPublished
Publication dates
Online15 Feb 2018
Publication process dates
Accepted08 Aug 2017
PublisherSpringer Nature
Springer
Copyright licensePublisher copyright
ISSN0032-079X

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