The ultrastructure of zoospores of Phytophthora megasperma var. sojae

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Abstract
The zoospore of Phytophthora megasperma var. sojae is bounded by a unit membrane. Ribosomes, mitochondria, and vesicles with amorphous or crystalline contents occur throughout the zoospore with the exception of the groove region which is characterized by the presence of microtubules, transversely striated elements of unknown nature, and a large vacuole. The flagella, with typical 9 + 2 fibril arrangement, are inserted on a small ridge which lies across the groove. Conspicuous rough endoplasmic reticulum is present in the form of bands around the nucleus and in the cytoplasm. Interspersed amongst the vesicles, just below the surface of the zoospore, are some bodies resembling microbodies or spherosomes.