Figure 2.

Effect of the DP of OGA on their ability to induce alkalinization in the incubation medium of intact cucumber seedlings. Each OGA fraction was tested at four concentrations in at least three separate experiments. The activity of each OGA treatment was calculated by the ratio of the pH increase induced by that treatment divided by the average alkalinization response induced by saturating concentrations of OGA pool in the same experiment (pH/pH_max). The data presented represent the mean ± se of pH/pH_max at a concentration of 2.84 μm as determined by an analysis of covariance model. The letters represent groups that are significantly different based on Bonferroni adjusted multiple comparisons (see text for P values).