Abstract
The quantitative changes in organelles of Phytophthora infestans in tomato leaves that had previously been treated with the systemic fungicide fosetyl-Al (2000 μg · ml −1) were measured by electron microscopy 15 and 18 hr after inoculation. The fungal nuclei and ribosomes did not show alterations in fine structure and numbers, although the nuclear form, and shape of some haustoria, had changed by 18 hr after inoculation. Some components of the endomembrane system such as vacuoles and dictyosome vesicles were apparent in thin sections 15 hr after inoculation. Invagination of the plasmalemma increased. The width of dictyosomes and the amount of endoplasmic reticulum increased by 18 hr. Mitochondrial size differed from that of the control after 15 hr. In addition, vacuoles were present in the subapical region of hyphal tips in fosetyl-Al-treated tissues. Changes in these fungal structures and their possible relation to the mode of action of the fungicide are discussed.
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