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Interaktionen von Auxin und Äthylen bei der thigmotropen Bewegung der Ranken von Cucumis sativus

Auxin-ethylene interactions in the thigmotropic response of Cucumber tendrils

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Summary

Coiling of intact or excised cucumber (Cucumis sativus) tendrils can be induced by IAA or ethylene. The velocity of coiling in different regions of the tendrils correlates with the capacity for auxin-stimulated ethylene synthesis. Ethylene (Ethephon) induces an increase in membrane permeability of tendrils, and as a result the efflux of substances previously taken up (glucose) is stimulated. It is assumed that this may contribute to the contraction of the ventral side of the tendril. The excretion of glucose after ethylene treatment can be reduced by Ca2+, and calcium also inhibits coiling of tendrils following incubation in ethephon solution. Auxin stimulated ethylene synthesis in the ventral half of the tendril is several times higher than in the dorsal half and it is hypothesized that this may be a cause for the different reactions of the two sides of a tendril following a mechanical stimulus.

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Authors and Affiliations

  1. Abteilung für Obstbau und Gemüsebau, Universität Hohenheim, Emil Wolff-Straße 25, D-7000, Stuttgart-70, Federal Republic of Germany

    F. Bangerth

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  1. F. Bangerth
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Abkürzungen: IAA=Indol-3-essigsäure; ABA=Abscisinsäure

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Bangerth, F. Interaktionen von Auxin und Äthylen bei der thigmotropen Bewegung der Ranken von Cucumis sativus . Planta 117, 329–338 (1974). https://doi.org/10.1007/BF00388027

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  • DOI: https://doi.org/10.1007/BF00388027

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