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000154274 0247_ $$2doi$$a10.1093/jxb/ert160
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000154274 0247_ $$2ISSN$$a1460-2431
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000154274 1001_ $$0P:(DE-HGF)0$$aSingh, S. P.$$b0$$eCorresponding author
000154274 245__ $$aPattern of iron distribution in maternal and filial tissues in wheat grains with contrasting levels of iron
000154274 260__ $$aOxford$$bUniv. Press$$c2013
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000154274 520__ $$aIron insufficiency is a worldwide problem in human diets. In cereals like wheat, the bran layer of the grains is an important source of iron. However, the dietary availability of iron in wheat flour is limited due to the loss of the iron-rich bran during milling and processing and the presence of anti-nutrients like phytic acid that keep iron strongly chelated in the grain. The present study investigated the localization of iron and phosphorus in grain tissues of wheat genotypes with contrasting grain iron content using synchrotron-based micro-X-ray fluorescence (micro-XRF) and micro-protoninduced X-ray emission (micro-PIXE). X-ray absorption near-edge spectroscopy (XANES) was employed to determinethe proportion of divalent and trivalent forms of Fe in the grains. It revealed the abundance of oxygen, phosphorus, and sulphur in the local chemical environment of Fe in grains, as Fe-O-P-R and Fe-O-S-R coordination. Contrasting differences were noticed in tissue-specific relative localization of Fe, P, and S among the different genotypes, suggesting a possible effect of localization pattern on iron bioavailability. The current study reports the shift in iron distribution from maternal to filial tissues of grains during the evolution of wheat from its wild relatives to the present-day cultivated varieties, and thus suggests the value of detailed physical localization studies in varietal improvement programmes for food crops.
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000154274 7001_ $$0P:(DE-H253)PIP1015286$$aVogel-Mikus, K.$$b1
000154274 7001_ $$0P:(DE-H253)PIP1008387$$aArcon, I.$$b2
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000154274 7001_ $$0P:(DE-HGF)0$$aJeromel, L.$$b4
000154274 7001_ $$0P:(DE-HGF)0$$aPelicon, P.$$b5
000154274 7001_ $$0P:(DE-H253)PIP1020362$$aKumar, J.$$b6
000154274 7001_ $$0P:(DE-HGF)0$$aTuli, R.$$b7
000154274 773__ $$0PERI:(DE-600)1466717-4$$a10.1093/jxb/ert160$$gVol. 64, no. 11, p. 3249 - 3260$$n11$$p3249 - 3260$$tThe @journal of experimental botany$$v64$$x1460-2431$$y2013
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