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The Physiology of Stomata

The Physiology of Stomata


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 Excerpt: ... from the plant. By studying the process of wilting in Verbena by means of this apparatus, I found that in leaves of fair or full maturity the period of wilting embraced two distinct phases. Thus, if a leaf, with the ventral surface up, be so oriented that the indicator is placed in a horizontal position, this will at first move upwards for some time, after which it will begin to drop. This is illustrated by the following readings at 1-minute intervals, the plus sign indicating upward and the minus sign downward movement. +--. 1 1-5. 3. 4-5. 6, 7, 7, 6.5, 5.5, 4, 2, o, 2.5, 5, 8, 10.5, 12, 14. The total length of the whole period and the ratio between the two phases will depend upon the maturity of the leaf and the consequent interactions of the mechanical tissues present. In quite young leaves there is no upward movement at all. Not all kinds of leaves show an upward movement upon wilting, though I have noted it in the so-called sensitive fern Onoclea sensi Darwin records experiments showing this general wilting and stomatal closure loc. cit.). bilis (Lloyd, 1902), and the inrolling on grass leaves may be regarded as a similar movement, clearly due to mechanical conditions resident in the tissues. Though the experiment is very simple it nevertheless helps one to form a conception of what goes on in the verbena leaf during wilting. It seems probable that during the first few minutes the loss of water results in a general lowering of tensions produced by high turgidity, the particular kind of movement of any leaf being one brought about as the result of its particular arrangement of tissues. This lowering of tensions means also a squeezing together of the cells and a reduction of the inter-cellular spaces, which again will result in the sudden forcing out of...


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Product Details
  • ISBN-13: 9781151782816
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 52
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1151782815
  • Publisher Date: 07 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr


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