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TORSIONS AND THEIR ANALYSIS

TORSIONS AND THEIR ANALYSIS , BY R. SNOW (With 9 figures in the text) ' ' ; ' 1. INTRODUCTION Fellow of Magdalen College, Oxford ow do petioles, flower stalks, dorsiventral stems and other dorsiventral organs carry out the torsions by which they orientate themselves to light and gravity? A very full and valuable discussion of this rather neglected problem, with references to earlier work, has been given by Rawitscher (1932), and some experiments by Staub (1934) will be discussed at the end of the present paper. Rawitscher concludes that these torsions cannot in general be explained as due to two successive curves in different planes: for though two such curves can cause torsions, yet many organs carry out torsions while remaining practically straight. He rejects also various other early attempts to explain these torsions, and concludes (pp. 201 seq.) that the only adequate explanation is that when the organ is stimulated, its cells elongate obliquely, in directions which form helices round the long axis of the organ, instead of elongating parallel to that axis. It must further be supposed that the helices may be either right-hand or left-hand according to the direction in which the stimulus is acting, since in nature http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png New Phytologist Wiley

TORSIONS AND THEIR ANALYSIS

SNOW, R.
New Phytologist , Volume 41 (1) – May 1, 1942
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References (8)

Publisher
Wiley
Copyright
Copyright © 1942 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0028-646X
eISSN
1469-8137
DOI
10.1111/j.1469-8137.1942.tb07057.x
Publisher site
See Article on Publisher Site

Abstract

, BY R. SNOW (With 9 figures in the text) ' ' ; ' 1. INTRODUCTION Fellow of Magdalen College, Oxford ow do petioles, flower stalks, dorsiventral stems and other dorsiventral organs carry out the torsions by which they orientate themselves to light and gravity? A very full and valuable discussion of this rather neglected problem, with references to earlier work, has been given by Rawitscher (1932), and some experiments by Staub (1934) will be discussed at the end of the present paper. Rawitscher concludes that these torsions cannot in general be explained as due to two successive curves in different planes: for though two such curves can cause torsions, yet many organs carry out torsions while remaining practically straight. He rejects also various other early attempts to explain these torsions, and concludes (pp. 201 seq.) that the only adequate explanation is that when the organ is stimulated, its cells elongate obliquely, in directions which form helices round the long axis of the organ, instead of elongating parallel to that axis. It must further be supposed that the helices may be either right-hand or left-hand according to the direction in which the stimulus is acting, since in nature

Journal

New Phytologist – Wiley

Published: May 1, 1942

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