Table 4. Overexpressing VAMP721, but Not VAMP723, Suppresses the Inward-Rectifying K⁺ Current in Arabidopsis Root Epidermal Cells.

	V1/2 (mV)	gmax (ms)	δ
Wild type (nontransformed)	−195.7 ± 1.4	1.38 ± 0.04	−1.43 ± 0.06
+VAMP723		1.27 ± 0.04
+VAMP721Y57D		1.41 ± 0.03
+VAMP721	−277.2 ± 4.9*

Parameter values are results of joint, nonlinear least-squares fitting of K⁺ currents in Figure 11. Fittings were carried out with the gating charge, δ, held in common. Values for g_max were allowed to vary between data sets recorded on overexpressing VAMP721, VAMP723, and VAMP721^Y57D. g_max was held in common between the wild-type (nontransformed) and VAMP721-overexpressing roots. Voltages giving half-maximal conductance V_1/2 were allowed only between data sets for the wild-type and VAMP721-overexpressing plants. Data are from five or more separate experiments for each construct combination and are given as means ± se. Significance for V_1/2 as the difference from the wild-type (nontransformed) plants at *P < 0.01.