Nuclear Elimination during Cyst Formation in Woronina pythii (Plasmodiophoromycetes)

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Abstract
Nuclear elimination in W. pythii was a complex event that occurred in a series of steps during the formation of cysts. Approximately 16% of the nuclei within each plasmodium migrated, aggregated, fused and degenerated as the parasite thallus matured. During each step of the elimination-degeneration process, the movements and behavior of nuclei were coordinated synchronously. Each nucleus had at least 3 nuclear projections. Nuclear projections might function as internuclear spacing devices which establish and maintain a specific 3-dimensional distance between contiguous nuclei within each multinucleate plasmodium. The elimination of nuclei probably aids in establishing a proper nucleoplasmic-cytoplasmic ratio prior to cyst formation.