Table 2. Cation-dependent H⁺ antiporter activity in isolated leaf vacuoles.

Initial rates of cation-dependent H⁺ transport (Fig. 8) are shown. %Q, Percentage of fluorescence quenching.

Plant	100 mm NaCl	100 mm KCl
	%Q min−1
Wild type	2.02 ± 0.38	1.98 ± 0.27
nhx1/2/3/4	0.09 ± 0.08	0.10 ± 0.10