Plasma is a partially ionized gas and quark-neuon plasma is theorized to produce enough energy to stabilize wormholes. We know nothing of wormholes becuase they are unstable.
A wormhole is just a curvature in the space-time continuum. Plasma physics deals with the study of high energy materials in which particles are ionized. Since the core of the wormholes are in high energy state, they may emit high energy plasma jets.