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Quantified SXRF tomograms of Arabidopsis seed, Col-0 wild type (WT), cax1-1, cax3-1, and cax1cax3 mutants, and transgenic line 35S-sCAX1, collected with a 7- × 10-μm beam. Tomograms for each element are scaled to the highest maximum pixel abundance, shown on the color bar, expressed as μg cm−2; the minim is zero for all elements. c, Cotyledons; r, radicle; sc, seed coat (within the embryo). Embryonic cotyledons are arranged with the adaxial (upper) surfaces facing one another.
