Elementary botany elementarybotany00atki Year: 1898 CHAPTER IV. TURGESCENCE. 58. Turgidity of plant parts.—As we have seen by the experiments on the leaves, turgescence of the cells is one of the conditions which enables the leaves to stand out from the stem, and the lamina of the leaves to remain in an expanded position, so that they are better exposed to the light, and to the currents of air. Were it not for this turgidity the leaves would hang down close against the stem. 59. Restoration of turgidity in shoots.—If we cut off a living stem of geranium, coleus, tomato, or ' balsam,' and all
Elementary botany elementarybotany00atki Year: 1898 CHAPTER IV. TURGESCENCE. 58. Turgidity of plant parts.—As we have seen by the experiments on the leaves, turgescence of the cells is one of the conditions which enables the leaves to stand out from the stem, and the lamina of the leaves to remain in an expanded position, so that they are better exposed to the light, and to the currents of air. Were it not for this turgidity the leaves would hang down close against the stem. 59. Restoration of turgidity in shoots.—If we cut off a living stem of geranium, coleus, tomato, or ' balsam,' and allow the leaves to partly wilt so that the shoot loses its turgidity, it is possible for this shoot to regain turgidity. 'The end may be freshly cut again, placed in a vessel of water, covered with a bell jar and kept in a room where the temperature is suitable for the growth of the plant. The shoot will usually become turgid again from the water which is absorbed through the cut end of the stem and is carried into the leaves where the individual cells become turgid, and the leaves are again expanded. Such shoots, ;iiid the excised lea\ es also, may often be made turgid again bv simply immersing them in water, as one of the experiments with the salt solution would teach. I he i in end of tin- sh< GO. Turgidity may In- restored more certainly and quickly in a partially wilted shoot in another way. ol may be inserted in a l tube as shown in fig, 31, the end of the tube around the stem i tin- plant being made air tight. The arm 28
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