Figure 7.

Distribution of Mn in part of a leaf blade and in NGTs of a sunflower leaf grown for 16 d at 100 µm Mn. A, High Mn is present mostly at bases of NGTs. B, Close-up of the base of a trichome identified by the white box in A that was examined using XANES imaging overlaid with the three pixel populations identified using the energy association module in GeoPIXE as shown in Supplemental Figure S15. C, Average XANES spectra extracted from the three pixel populations identified in B.