Table I.

Current amplitude ratios for AtHKT1 of monovalent cations relative to Na+

CationPercentage of Na+ Current Amplitude
%
Li+ 1.6 ± 0.25
Na+ 100
K+ 3.3 ± 0.66
Rb+ 3.5 ± 0.42
Cs+ 1.6 ± 0.60

Values represent means ± sd of currents measured at −120 mV and relative to the Na+ current amplitude, which was defined as 100% for each oocyte. Data obtained from four oocytes were averaged.