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      Dic      Medicinal plants (PG 101)                                                Level 1                              Clinical Pharmacy-PharmD




                                                         3- Vacuoles



            Mature cells of the plants have vacuoles which may enlarge to much an extent that the
            cytoplasm located adjacent to the cell walls.

                    ■ The vacuoles are filled with cell sap.

                    ■ It is surrounded by lipoprotein membrane called tonoplast.

                    ■ The vacuole may contain pigments as anthocyanin e.g., Colored petals.





                                       Ergastic substance




            o  The materials present in the vacuoles are known as ergastic.

            o  They are either reserve substances that may be utilized by the protoplast, for vital
                activities or they are by-products of metabolism.
            o  Ergastic substances occur in vacuoles and in the cell wall.





























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