Figure 8.

Kinetics of ⁸⁶Rb⁺ uptake in roots of the athak5 akt1 double mutant. ⁸⁶Rb⁺ uptake kinetics in roots of intact wild-type, athak5, akt1, and athak5 akt1 plants demonstrate the absence of high-affinity Rb⁺(K⁺) uptake in athak5 akt1 double mutants. Hydroponically grown plants were subjected to K⁺ starvation for 4 d prior to performing uptake experiments. Data represent averages (n = 9–21) ± se from three to six independent experiments. Lines represent results of fitting Michaelis-Menten kinetics to data using the SigmaPlot (SPSS) curve-fitting function (one-term Michaelis-Menten equation). FW, Fresh weight.