Abstract
Apical meristems of Isoetes setacea Lam., in condition of drought resistance exhibit large protein and lipid storage. After nonaqueous fixation, lipids appear as large amorphous sheets which occupy nearly the whole cellular volume. The study of the ultrastructure of these meristematic cells during the first days of rehydration reveals three processes of lipid lysis: (1) A digestion in vacuolar space which is formed by autolysis of protein bodies; (2) An in situ solubilisation of lipid bodies adjacent to ER membranes; (3) A lysis of the remaining lipid bodies by digestion of sequestered cytoplasmic areas in which they are enclosed.
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