After the action of capsidiol on the hyphae of Phytophthora capsici in vitro, observations with electron microscopy revealed alterations in the cell wall, in the plasmalemma, in the mitochondria, and in the Golgi system. Among other effects, phytoalexin stimulated the separation of the external cell wall layers, liberating a three-component filament. Such cytomorphological events were also recorded in situ on sections, when the fungus parasitized the leaves of Capsicum annuum. [Translated by the Journal]
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