Figure 3.
Time courses of Glu (A), Arg (B), and Pro (C) concentrations in the root tip. Data are means ± se of three to eight samples from different experiments. Each sample contained the apical 10 mm of two roots. The inset in each panel shows the time course of amino acid concentration after transfer to the labeling box. In the insets, open symbols represent the apical section and closed symbols represent the basal section (harvested as described for Fig. 1). Data in the insets are means ± se of six samples, each from a separate experiment. Time courses of the amino acids Asp, Asn, Ser, Gln, Arg, GABA, Thr, and Ala were also analyzed and exhibited responses to low ψw similar to those of Glu and Arg.