Table I. Fittings for I_K,in and I_K,out from Arabidopsis guard cells to a Boltzmann function (see Eq. 1).

Fitted curves for wild-type and slac1-1 currents are as shown (for details, see Figs. 1 and 6). Best fittings were obtained with the voltage sensitivity coefficient (gating charge; δ), held in common in both cases, and with the voltage yielding half-maximal conductance (V_1/2), held in common for I_K,out, as indicated. Note the roughly 80% reduction in maximum conductance (g_max) for I_K,in and its 60% enhancement for I_K,out in the slac1-1 mutant.

Parameter	Wild Type	slac1-1	pSLAC1
IK,in (δ, −1.9 ± 0.1)
gmax (μS cm−2)	4.83 ± 0.08	0.99 ± 0.07	5.20 ± 0.09
V1/2 (mV)	−187 ± 3	−202 ± 2	−189 ± 2
IK,out (δ, 2.0 ± 0.1; V1/2 −7 ± 2 mV)
gmax (μS cm−2)	1.65 ± 0.07	2.83 ± 0.09	1.84 ± 0.08