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

Mathers, Andrew; Young, Scott D.; McGrath, Steve P.; Zhao, Fang‐Jie; Crout, N.M.J.; Bailey, Elizabeth H.

doi:10.1007/s11104-017-3374-y

Cited by 28 publications

(38 citation statements)

References 41 publications

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“…This greater efficiency of foliar-applied fertilizers may be ascribed to (1) rapid uptake and assimilation due to application at a later growth stage, (2) less influence of root-to-shoot ratio on translocation to the edible parts of crops and (3) the avoidance of losses through fixation in soils. On average, only 12% of soil-applied Se fertilizers is taken up by plants; most Se applied is retained and immobilized in the soil 7 , with very little residual value for subsequent crops 17 . This means that repeated applications of Se fertilizers are required for each growth period, unless the efficacy of Se fertilizers can be improved.…”

Section: Introductionmentioning

confidence: 99%

Improving the efficacy of selenium fertilizers for wheat biofortification

Ramkissoon

Degryse

Silva

et al. 2019

Sci Rep

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Increasing the selenium (Se) concentration of staple crops by fertilization is a valuable pathway to increase Se in the human diet, thus preventing Se deficiency. A pot trial was set up to investigate whether the application of 3.33 µg kg−1 of Se (equivalent to 10 g ha−1) to wheat can be made more efficient by its co-application with macronutrient carriers, either to the soil or to the leaves. In the soil, Se was applied either on its own (selenate only) or as a granular, Se-enriched macronutrient fertilizer supplying nitrogen, phosphorus, potassium or sulfur. Selenium was also applied to leaves at head emergence with, or without, 2% w/v N fertilizers. With grain Se concentrations varying from 0.13–0.84 mg kg−1, soil application of selenate-only was 2–15 times more effective than granular Se-enriched macronutrient fertilizers in raising grain Se concentrations. Co-application of foliar Se with an N carrier doubled the Se concentration in wheat grains compared to the application of foliar Se on its own, the majority of which was in the highly bioavailable selenomethionine fraction. Results from this study demonstrate the possibility of improving the efficacy of Se fertilizers, which could enrich crops with Se without additional application costs in the field.

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Section: Introductionmentioning

confidence: 99%

Improving the efficacy of selenium fertilizers for wheat biofortification

Ramkissoon

Degryse

Silva

et al. 2019

Sci Rep

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“…A soil sequential fractionation procedure was adapted from Mathers et al (2017) and Shetaya et al (2012) to provide three fractions of Si, S, Se and I nominally identified as ‘Soluble’ (0.01 M KNO 3 ), ‘Adsorbed’ (0.016 M KH 2 PO 4 ) and ‘Organic’ (10% TMAH). Analysis was by ICP-MS (Thermo Fisher iCAP Q) in H 2 cell mode (Si and Se) or He cell mode with kinetic energy discrimination (I and S).…”

Section: Methodsmentioning

confidence: 99%

Spatial prediction of the concentration of selenium (Se) in grain across part of Amhara Region, Ethiopia

Gashu

Lark

Milne

et al. 2020

Science of The Total Environment

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Grain and soil were sampled across a large part of Amhara, Ethiopia in a study motivated by prior evidence of selenium (Se) deficiency in the Region's population. The grain samples (teff, Eragrostis tef , and wheat, Triticum aestivum ) were analysed for concentration of Se and the soils were analysed for various properties, including Se concentration measured in different extractants. Predictive models for concentration of Se in the respective grains were developed, and the predicted values, along with observed concentrations in the two grains were represented by a multivariate linear mixed model in which selected covariates, derived from remote sensor observations and a digital elevation model, were included as fixed effects. In all modelling steps the selection of predictors was done using false discovery rate control, to avoid over-fitting, and using an α-investment procedure to maximize the statistical power to detect significant relationships by ordering the tests in a sequence based on scientific understanding of the underlying processes likely to control Se concentration in grain. Cross-validation indicated that uncertainties in the empirical best linear unbiased predictions of the Se concentration in both grains were well-characterized by the prediction error variances obtained from the model. The predictions were displayed as maps, and their uncertainty was characterized by computing the probability that the true concentration of Se in grain would be such that a standard serving would not provide the recommended daily allowance of Se. The spatial variation of grain Se was substantial, concentrations in wheat and teff differed but showed the same broad spatial pattern. Such information could be used to target effective interventions to address Se deficiency, and the general procedure used for mapping could be applied to other micronutrients and crops in similar settings.

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“…The spatial determination of minerals present in seeds can strengthen biofortification efforts, improve the understanding of the elemental redistribution during seed processing, steps such as grain polishing and crushing. Altogether, this can ensure that nutrients will reach the final consumer ( Gregory et al, 2017 ; Mathers et al, 2017 ; Zaman et al, 2018 ).…”

Section: Resultsmentioning

confidence: 99%

Laboratory Microprobe X-Ray Fluorescence in Plant Science: Emerging Applications and Case Studies

et al. 2018

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In vivo and micro chemical analytical methods have the potential to improve our understanding of plant metabolism and development. Benchtop microprobe X-ray fluorescence spectroscopy (μ-XRF) presents a huge potential for facing this challenge. Excitation beams of 30 μm and 1 mm in diameter were employed to address questions in seed technology, phytopathology, plant physiology, and bioremediation. Different elements were analyzed in several situations of agronomic interest: (i) Examples of μ-XRF yielding quantitative maps that reveal the spatial distribution of zinc in common beans (Phaseolus vulgaris) primed seeds. (ii) Chemical images daily recorded at a soybean leaf (Glycine max) infected by anthracnose showed that phosphorus, sulfur, and calcium trended to concentrate in the disease spot. (iii) In vivo measurements at the stem of P. vulgaris showed that under root exposure, manganese is absorbed and transported nearly 10-fold faster than iron. (iv) Quantitative maps showed that the lead distribution in a leaf of Eucalyptus hybrid was not homogenous, this element accumulated mainly in the leaf border and midrib, the lead hotspots reached up to 13,400 mg lead kg-1 fresh tissue weight. These case studies highlight the ability of μ-XRF in performing qualitative and quantitative elemental analysis of fresh and living plant tissues. Thus, it can probe dynamic biological phenomena non-destructively and in real time.

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

Abstract: Aims The principal aim of this research was to quantify retention of a single, realistic Se biofortification application (10 g ha) in contrasting soils over two growing seasons utilizing an enriched stable Se isotope ( 77

Cited by 28 publications

References 41 publications

Improving the efficacy of selenium fertilizers for wheat biofortification

Improving the efficacy of selenium fertilizers for wheat biofortification

Spatial prediction of the concentration of selenium (Se) in grain across part of Amhara Region, Ethiopia

Laboratory Microprobe X-Ray Fluorescence in Plant Science: Emerging Applications and Case Studies

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