Percentage distributions of Zn, Fe, K, Ca, and Mn in different fractions of rice grains.

<p>Data are the means of four replicates.</p

µ-XRF elemental maps of early stage rice seedlings after seed germination for 48

<p> <b>h.</b> The orientation of the individual µ-XRF elemental maps and the color-merged image (upper right) is the same as that of the green rectangle around a portion of the labeled image of the germinating seed. Refer to the legend for <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0057360#pone-0057360-g004" target="_blank">Figure 4</a> for additional details.</p

Elemental concentrations of rice grains, hull, brown rice, bran, and polished rice.

<p>All concentrations are expressed as mg kg⁻¹ DW. Data points and error bars represent means and SEs of four replicates.</p

Typical synchrotron radiation X-ray fluorescence (SR-XRF) microprobe spectrum in an embryo localized scanning point of rice grain.

<p>Typical synchrotron radiation X-ray fluorescence (SR-XRF) microprobe spectrum in an embryo localized scanning point of rice grain.</p

µ-XRF elemental maps of rice grains after germination for 12 h.

<p>The green box on the lower magnification photo of the seed (upper, left) was rotated 90° clockwise to give the labeled, higher magnification image as well as the individual µ-XRF elemental maps and the color-merged image (lower left). Refer to the legend for <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0057360#pone-0057360-g004" target="_blank">Figure 4</a> for additional details.</p