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Translocation of photoassimilates in wound-sieve tubes

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Abstract

Microautoradiographic examination of wound-sieve tubes, formed after surgical interruption of a vascular bundle in the stem of Impatiens holstii Engl. et Warb, was conducted to investigate their structurefunction relationship in photoassimilate translocation. The irregular shaped wound-sieve tubes form tangential bridges connecting the wounded bundle with the intact neighbouring bundles. The wound-sieve elements differentiate in parenchyma cells which dedifferentiate and resume mitotic activity. Companion cells and various numbers of associated cells accompany the wound-sieve elements. Microautoradiographs of wound-sieve tubes were obtained from both cross and tangential sections after exposing the leaf above the wounded bundle to 14CO2. Labeled photoassimilates were found in woundsieve tubes, beginning about 6 d after wounding. Adjacent to completed wound-sieve tube bridges there are small complexes of isolated wound-sieve elements and incomplete bridges. Almost all wound-sieve elements contain the nucleus. Functionality of a wound-sieve tube is reached when its members are connected by sieve plates.

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Author notes

  1. Karin Ruth Jacobsen

    Present address: Botanisches Institut der Universität, Gyrhofstrasse 15, 41, Köln, Germany

Authors and Affiliations

  1. Institut für Forstbotanik der Universität, Büsgenweg 2, D-3400, Göttingen, Germany

    Karin Ruth Jacobsen & Walter Eschrich

Authors
  1. Karin Ruth Jacobsen
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  2. Walter Eschrich
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Additional information

We are indebted to Professor Ray F. Evert (University of Wisconsin, Department of Botany, Madison, Wi, USA) for giving the first author (K.R.J.) the possibility and advice for preparing the electron micrographs. The authors thank Yaffa Grossman (University of California, Department of Botany, Davis, CA, USA) for critical review of the manuscript. Supported by the Graduiertenförderung of the University of Göttingen, and by Deutscher Akademischer Austauschdienst.

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Ruth Jacobsen, K., Eschrich, W. Translocation of photoassimilates in wound-sieve tubes. Planta 181, 335–342 (1990). https://doi.org/10.1007/BF00195885

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  • DOI: https://doi.org/10.1007/BF00195885

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