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Bonamia sp., a serious pathogen of oysters Tiostrea chilensis, was studied using the zinc iodide-osmium tetroxide technique (ZIO), the imidazole-osmium technique for lipids (IM), and reactivity for acid phosphatases [P-glycerophosphatase (P-GPase), cytidine monophosphatase at pH 5.0 (CMPase 5.0) and pH 2.7 (CMPase 2.7), thiamine pyrophosphatase (TPPase)], and P-galactosidase to try and determine the function of cytoplasmic organelles. Z10 reacted with the nuclear membrane, Golgi, endoplasmic reticulum (ER), cytoplasmic vesicles, and variably with putative phagosomes, the mitochondrial matrix, haplosporosomes and multivesicular bodies, but not lipoid bodies. IM strongly labelled lipoid bodies, and lipids in the nuclear membrane, ER except anastomosing ER (aER) and mitochondrial membranes and cristae, but was weak in aER and on haplosporosomes. P-GPase occurred in the nuclear membrane, some elements of ER, Golgi and mitochondrla, and in lipoid bodies. CMPase 5.0 was variable in Golgi and ER, but was stronger at pH 2.7 and occurred in the nuclear membrane. TPPase only occurred in a single Golgi cisterna, or very weakly in a few lipoid bodies. P-galactosidase was rarely seen, and only within Golgi. As there was considerable metabolism of unsaturated lipids and little hydrolytic enzyme content, it was concluded that Bonarnla sp. may synthesise lipids from triglycerides hydrolysed by haemocyte enzymes, reducing the need for parasite hydrolytic enzymes.

The functional cytology of Bonamia sp. (Haplosporidia) infecting oysters Tiostrea chilensis:an ultracytochemical study