A. The expression of ProPLT1:PLT1-YFP on MS medium or MS medium supplemented with ABA, GSH, or ABA plus GSH. Bars = 50 µm. B. The fluorescence of PLT1-YFP in (A). Fluorescence is expressed relative to that of the wild type in MS without supplement. Three independent experiments were done with similar results, each with three replicates. In each replicate, 8–15 roots were measured from one plate. Values are means ±SE from one experiment. Means with different letters are significantly different at P<0.01, except for c and d, d and e, at P<0.05. C. The expression of ProPLT1:CFP on MS medium or MS medium supplemented with ABA, GSH, or ABA plus GSH. Bars = 50 µm. D. The relative fluorescence of ProPLT1:CFP in (E). Fluorescence is expressed relative to that of the wild type in MS without supplement. Three independent experiments were done with similar results, each with three replicates. In each replicate, 8–15 roots were measured from one plate. Values are means ±SE from one experiment. Means with different letters are significantly different at P<0.01, except for a and b, c and d, at P<0.05. E. The expression of ProPLT2:PLT2-YFP on MS medium or MS medium supplemented with ABA, GSH, or ABA plus GSH. Bars = 50 µm. F. The relative fluorescence of PLT2-YFP in (C). Fluorescence is expressed relative to that of the wild type in MS without supplement. Three independent experiments were done with similar results, each with three replicates. In each replicate, 8–15 roots were measured from one plate. Values are means ±SE from one experiment. Means with different letters are significantly different at P<0.05.