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By Ludwig Aletsee (auth.), Ludwig Aletsee, Dr. L. Anker, Dr. ès Sciences, Professeur Lucien Baillaud, G. H. Banbury, Dr. Leo Brauner, Dr. W. Mary L. Crombie, Professor Dr. G. Drews, Dr., rer. nat. habil. Manfred Girbardt, Dozent Dr. Wolfgang Haupt, Privat-Do

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Additional info for Physiology of Movements / Physiologie der Bewegungen: Part 2: Movements due to the Effects of Temperature, Gravity, Chemical Factors and Internal Factors / Teil2: Bewegungen durch Einflusse der Temperatur, Schwerkraft, Chemischer Faktoren und aus Inneren

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Nat. Kl. : Über den Einfluß der strahlenden Wärme auf wachsende Pflanzenteile. Bot. Ztg 41, 457-470, 473-480 (1883). - über den Thermotl'opismus der Wurzeln. Bot. Ztg 43, 193-200, 209-216, 225-235 (1885). Thermonasty. By W. Mary L. Crombie (nee Wood). With 8 figures. I. Introduction. Thermonastically sensitive organs are those which respond to a change in temperature by movement. The type of response depends on the structure of the organ, but is frequently a curvature as for example in the tepals of certain flowers, which curve outwards in response to temperature rise and inwards in response to temperature fall.

Inwieweit sich ein Teil der geschilderten Bewegungen auf Thermowachstumsreaktionen zurückführen läßt, wird sich erst sagen lassen, wenn mehr über derartige Übergangsreaktionen an Wurzeln bekannt ist. 12 LUDWIG ALETSEE: Thermotropismus. Man wird aber annehmen dürfen, daß solche Reaktionen in erheblich kürzerer Zeit als die meisten der genannten Bewegungen zur Geltung kommen würden. Letzten Endes aber muß mit der Beteiligung komplizierterer Wachstumsprozesse - entsprechend den im Zusammenhang mit der Abhandlung der Avena-Koleoptile gegebenen Hinweisen - gerechnet werden.

It has been shown that these movements are onlyslightly affeeted by light. Eight phases have been distinguished by BÖHNER (1933, 1934) in a eomplete sequenee of opening and elosing in flowers of Tulipa . These are: 1. Closed flower whieh is not yet ready to open. The tepals come to a point and close over one another at the tip, and the angle between the base of the tepals a) b) and the stern is obtuse. Fig. la and b. Typical closed and open flower 01 Tulipa. a CIosed 2, Closed flower whieh flower at low temperature.

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