Sporoplasm

Sporoplasm is an infectious material present in the cytoplasm of various fungi-like organisms, such as members of class Microsporidia.

Sporoplasm is defined as a mass of protoplasm that gives rise to or forms a spore.

The protoplasmic body that is released as an infective amoebula from a cnidosporidian cyst.

[1] It is injected to host cell through a coiled polar tube which acts as a spring-like tubular extrusion mechanism.

[2] Multiplication occurs either by merogony (binary fission) or schizogony (multiple fission) or plasmotomy (division of nucleus without relation to cytoplasm to produce multi-nucleated offspring).

Figure showing stage in which sporoplasm is injected into host cells via polar tube.
Figure showing process by which a sporoplasm is injected into host cells via polar tube (stage 3).