Fig 8.

The process of microsporidian germination and sporoplasm formation. When microsporidian mature spore is appropriately stimulated, the PV becomes larger. Driven by the PV, the polar filament rapidly evaginates to transform the hollow polar tube, and the anterior part of polaroplast is injected into the polar tube. Then, the spore nucleus is elongated and transported through the polar tube. The polaroplast stays at the tip of the polar tube to form a bubble and encloses the nucleus. Finally, the sporoplasm falls off from the polar tube.