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La distribuzione e la funziona-lita dellacqua nella cellula vegetale

, : La distribuzione e la funziona-lita dellacqua nella cellula vegetale. Nuovo Gior Bot Ital: 419-557,

The water of plant cells exists in 4 types: (a) "reserve water," i.e., that which may be lost without appreciably affecting cell activity; (b) that which is necessary for proper cell functioning but which gradually diminishes as a normal physiological process during the progressive dehydration which accompanies ripening; (c) that which is necessary for cell activity but which becomes greatly reduced in amt. with transition of plants to the dormant period; and (d) that which is associated either physically or chemically with non-living portions of the cell and which may be reduced in amt. only under high temps. Exptl. studies determined differences in water content of plant parts in states of activity and of dormancy, the materials being root of carrot, seeds of horse-chestnut, buds of walnut, young branches of Amorpha jruticosa, cataphylls and normal leaves of Narcissus, fruits of plum, peach, and apple. Samples were dried under various treatments and at different temps. These extensive studies do not admit of summarization. The author decides that the plant contains: (1) intercellular water, (2) water dispersing the colloidal constituents of the cell membrane, (3) water of the vacuoles, (4) plasmatic water in cells which are (a) active and (b) latent, (5) water bound to non-living cell constituents. Different proportions of the author's "muco-proteid" in the various parts of cells and of tissues control loss of water not only in exptl. studies but regulate water economy of the living plant, especially under xeric conditions.


DOI: 10.1080/11263503809438765

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