Glutamate-gated receptor that probably acts as non-selective cation channel. Mediates leaf-to-leaf wound signaling. May be involved in light-signal transduction and calcium homeostasis via the regulation of calcium influx into cells. May form heteromers. Expressed predominantly in roots and siliques. Reduced wound-activated surface potential changes (WASP) duration in the systemic leaves, resulting in a decreased induction of the regulators of jasmonate-signaling. Glr3.3 and glr3.6 double mutant has no detectable changes in surface potential in systemic leaves and the induction of the regulators of jasmonate-signaling is more strongly decreased. Belongs to the glutamate-gated ion channel (TC 1.A.10.1) family.