A comparison of the flagellar apparatus in Phytophthora, Saprolegnia, Thraustochytrium, and Rhizidiomyces
- 31 December 1984
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Botany
- Vol. 63 (1), 138-154
- https://doi.org/10.1139/b85-017
Abstract
The rootlet systems, kinetosomes, and transition zones in zoospores of Phytophthora parasitica, Thraustochytrium aureum, and Rhizidiomyces apophysatus and secondary zoospores of Saprolegnia diclina are compared. Rootlet systems in P. parasitica and S. diclina are very similar and there are only minor differences between these taxa in morphology of their transition zones. In P. parasitica and T. aureum a number of differences exist in the rootlet systems, but the position and orientation of individual rootlets are similar. There are also differences between these taxa in the alignment of their kinetosomes, the morphology of their kinetosome cores, and transition zones. Rhizidiomyces apophysatus has rootlets that correspond in position and orientation to P. parasitica, but there are not as many rootlets and these are morphologically distinctive. However, R. apophysatus and S. diclina have flagellar transition zones that are morphologically alike. Thus, probably the Hyphochytriomycetes are phylogenetically quite closely related to the Saprolegniales and more distantly related to the Peronosporales. In contrast, the Thraustochytriales are distantly related to the Oomycetes and Hyphochytriomycetes, but nonetheless similarities in the flagellar apparatus indicate that all have a common ancestor.This publication has 5 references indexed in Scilit:
- The ultrastructure of the zoospore of Hyphochytrium catenoidesCanadian Journal of Botany, 1985
- The zoospore of Schizochytrium aggregatumCanadian Journal of Botany, 1980
- The structure and phylogenetic significance of the flagellar transition region in the chlorophyll c-containing algaeBiosystems, 1979
- An ultrastructural analysis of the changes in organelle arrangement and structure between the various spore types of SaprolegniaCanadian Journal of Botany, 1977
- Ultrastructural observations of mature and encysting zoospores ofPythium proliferum de BaryProtoplasma, 1976