L'influence de la carence en pyridoxine sur la morphologie et l'ultrastructure cellulaire de Ceratocystis ulmi

Abstract

Deficiency in pyridoxine of a synthetic medium induces yeastlike growth of Ceratocystis ulmi. The addition of pyridoxine allows the organism, incubated 1 to 12 days in the absence of the vitamin, to recover in 24 h its filamentous growth morphology. The comparative study of the ultrastructure of mycelial and yeast cells reveals for the latter a thickening of the cell wall, a quantitative cytoplasmic impoverishment in endoplasmic reticulum and ribosomes, and an accumulation of lipidic and osmiophilic bodies.