Figure 7.

Reduced Vacuolar K⁺ Content in the nhx1 nhx2 Mutant.

K⁺ content in the vacuoles of guard cells (GC), epidermal cells neighboring the stomata (EC), and in mesophyll palisade cells (MP) of leaves as determined by scanning electron microscopy/EDX. Shown are the average percentage and sd of K⁺ counts relative to total elemental counts. A minimum of 20 cells of each cell type per line was analyzed. Statistical differences by the LSD method (P < 0.05) of mutant line L14 relative to the wild type are indicated by asterisks.