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Changes in the lanthanum distribution following decapitation of the sporophytes of an aquatic fern,Marsilea drummondii A. Br.

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Summary

The active terminal bud and the quiescent lateral buds and corresponding nodes inserted at different levels on the main rhizome ofMarsilea drummondii were examined with the EM afterin vivo feeding with lanthanum nitrate. These tracer experiments demonstrate that all the buds are fed by their phloem cells. In the lateral bud axis the labelling of the sieve elements apoplast indicates that a solute transfer took place in the node between xylem and phloem via xylem transfer cells. La3+ deposits are completely absent from the apical dome of inhibited buds indicating that the walls of the quiescent meristematic cells are not permeated by the tracer. The removal of the terminal bud has two effects. It rapidly (in 2 hours) allows the lanthanum to penetrate the lateral bud tip walls at a stage when no fine structural changes are discernable and to bind to the outer surface of the plasmalemma as it does in the active terminal bud. This study including inhibited buds and buds released from apical dominance support the view that changes in the state of the cell surface (cell wall and plasma membrane) may be a prerequisite for the resumption growth activity.

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Authors and Affiliations

  1. Laboratoire de Physiologie végétale, UER 59, Université P. et M. Curie, Tour 53, 5ème étage, 4, Place Jussieu, F-75230, Paris Cedex 05, France

    Y. Habricot & L. Sossountzov

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  1. Y. Habricot
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  2. L. Sossountzov
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This study was supported in part by a grant from the Centre National de la Recherche Scientifique to L.Sossountzov (AI 031275).

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Habricot, Y., Sossountzov, L. Changes in the lanthanum distribution following decapitation of the sporophytes of an aquatic fern,Marsilea drummondii A. Br.. Protoplasma 119, 141–149 (1984). https://doi.org/10.1007/BF01287826

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  • DOI: https://doi.org/10.1007/BF01287826

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