Figure 2.

Inhibition by suramin of medium alkalinization in response to systemin, chitosan, and pmg elicitor is concentration dependent. Cells of L. peruvianum were treated for 10 min with suramin at the concentrations indicated. The cells were then supplied with 1 nM systemin (○), 125 ng/ml chitosan (●), or 50 μg/ml pmg elicitor (×), and the pH change of the growth medium was determined after 7 min (systemin), 10 min (chitosan), or 20 min (pmg elicitor). The pH change is expressed as percentage of inhibition of medium alkalinization in the absence of suramin.