Ultrastructure and karyology of Tetramyxa parasitica (Plasmodiophoromycetes)

Abstract

Tetramyxa parasitica Goebel was located in galls on shoots of Ruppia maritima L. var. maritima and Zannichellia palustris L. subsp. repens (Boenn.) Schübler & Martens. Ultrastructural features of sporogenic (cystogenous) development included a host–parasite boundary of a single unit membrane, cruciform nuclear division in young plasmodia, synaptomenal complexes in nuclei of transitional plasmodia, and resting spores grouped in fours. Synaptonemal complexes in nuclei were counted through analysis of serial sections. The haploid chromosome number was determined to be 32, which distinguished Tetramyxa from other plasmodiophorid genera. Key words: karyotype, Tetramyxa, Plasmodiophoromycetes.