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Science 8 January 1988:
Vol. 239. no. 4836, pp. 187 - 190
DOI: 10.1126/science.3336780
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Articles

Science, Vol 239, Issue 4836, 187-190
Copyright © 1988 by American Association for the Advancement of Science

articles

Cell wall is required for fixation of the embryonic axis in Fucus zygotes

DL Kropf, B Kloareg, and RS Quatrano

Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331.

Establishment of a primary developmental axis generally is thought to involve rearrangements in the plasma membrane or cytoplasm of the egg. In this report the additional requirement for cell wall in polarization of Fucus zygotes was investigated. Protoplasts of fertilized eggs were tested for their ability to establish an axis in accordance with an orienting vector of unilateral light. The results demonstrate that cell wall is not required for axis formation. However, the orientation of the axis remains labile until new cell wall is synthesized. The presence of a cell wall is an absolute requirement for axis fixation.


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