Cytochemical studies on GERL, provacuoles, and vacuoles in root meristematic cells of <i>Euphorbia</i>

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  • Francis Marty
    Institut de Biologie cellulaire, Unité d'Enseignement et de Recherche Scientifique de Luminy, Université d'Aix-Marseille, 13288 Marseille Cedex 2, France

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<jats:p> The genesis of plant vacuoles has been studied by high-voltage and conventional electron microscopy. Vacuole genesis is a lysosomal multistep process: ( <jats:italic>i</jats:italic> ) GERL (Golgi-associated Endoplasmic Reticulum from which Lysosomes apparently form) produces provacuoles into which lysosomal enzymes and probably other materials appear to be concentrated and packaged; ( <jats:italic>ii</jats:italic> ) GERL-derived provacuoles cooperate to drive a programmed cellular autophagy leading to young vacuoles; and ( <jats:italic>iii</jats:italic> ) the young vacuoles swell and fuse together into a few large mature vacuoles which continue to collect the GERL-derived provacuoles throughout the life of the cell. </jats:p>

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