Archive image from page 188 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 Chapter XV 173 — Origin of Vacuoles plete dehydration leads finally to the transformation of these semi- fluid vacuoles into solid bodies (aleurone grains) by a solidification of their colloids. The aleurone grains, by taking up water anew, are capable of again assuming the semi-fluid consistency and ap- pearance of chondriosomes and, by a continuance of this process, may finally become liquid vacuoles. The filamentous appearance of the vacuoles seems to be the result
Archive image from page 188 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 Chapter XV 173 — Origin of Vacuoles plete dehydration leads finally to the transformation of these semi- fluid vacuoles into solid bodies (aleurone grains) by a solidification of their colloids. The aleurone grains, by taking up water anew, are capable of again assuming the semi-fluid consistency and ap- pearance of chondriosomes and, by a continuance of this process, may finally become liquid vacuoles. The filamentous appearance of the vacuoles seems to be the result of their semi-fluid state, for in the semi-fluid state, the vacuoles are generally filamentous or reticulate and stain uniformly and deeply with vital dyes. In the liquid state, the vacuoles are generally spherical and are stained only weakly with the vital dyes, which bring about a precipitation of the enclosed colloids as deeply stained granulations showing Brownian movement. The vacuoles are then composed of drops of a very dilute colloidal solution. In Fig. 120. — Saprolegnia. Modifications in form of vacu- olar system in a single branch, cultivated on 1 peptone bouillon with neutral red, in a van Tieghem and Le Monnier cell. 1-6, spherical vacuoles fuse to form a single canal which then, 7, 8, is transformed into a net- work (After Mile. Cassaigne). the solid state, they appear as globular bodies, which do not stain with vital dyes unless imbibition has previously taken place, but, on the contrary, always stain after fixation. The vacuoles, there- fore, may pass from one form to the other depending upon the water content of the cell. This reversibility has been obtained experimentally, further- more, in various cells, among others, in the epidermal cells of peri- anth parts of red tulips (Fig. 119). In the open flower, these cells contain a large vacuole, occupying almost the entire volume of the cell, and containing a concentrated solution of red anthocyanin
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