Figure 4.

Time- and concentration-dependent inhibition of the xylanase-induced alkalinization of tobacco cell culture medium by NAE 14:0. In A, the percent of overall inhibition (relative to medium controls) versus the log of the concentration of exogenously supplied NAE 14:0 is plotted. In B, the time required to achieve 50% inhibition versus the log of the concentration of exogenously supplied NAE 14:0 is plotted. The data points represent the averages ± sd of three independent experiments at each concentration.