Ultrastructure de l'hyphe végétatif de Sclerotinia fructigena

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Abstract
Vegetative hyphae of Sclerotinia (Monilia) fructigena (Ader and Ruhl) show a sharply polarized distribution of their organelles. In their tip, the "Spitzenkörper" made up of a microvesicular aggregate is well delimitated and surrounded by apical vesicles which can fuse with the plasmalemma. Excluded from the hyphal tip, mitochondria are elongated in the apicobasal polarity and in contact with numerous and often voluminous lipid globules. It appears that these lipid globules originate from the endomembranous system of the hyphae. The endoplasmic reticulum extends into pseudogolgi cisternae apparently generating apical vesicles. In the new hyphal branches, polarity seems to be initiated by the newly oriented endoplasmic reticulum from which originate microvesicles later aggregating into the new "Spitzenkörper." An elaborate system of microtubules also seems implicated in the further maintenance of the polarity of the growing hyphae. Microbodies with pseudocrystalline inclusions are also oriented according to the developmental polarity.

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