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The distribution of plasmodesmata in the phloem ofHevea brasiliensis in relation to laticifer loading

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Summary

Cell to cell connections, including plasmodesmata and perforations, were examined in the non-conducting secondary phloem ofHevea brasiliensis. Samples were taken from trunks of numerous trees, from several clones, and prepared for thin sectioning and transmission or scanning electron microscopy and as optical sections for fluorescence microscopy. Numerous plasmodesmata were found clustered in primary pit-fields between the ray and axial parenchyma cells. Between the laticifers and adjacent parenchyma sheath cells, structures corresponding to functional plasmodesmata were not observed. But some unusual structural features were occasionally seen in these walls. These observations are discussed in relation to the possible function of the cell types, and to the loss of latex on the tapping ofHevea. It is suggested that the loading of the laticifer might first require a symplastic pathway for the transport of metabolites, at the end of which the assimilates must enter the apoplast. A transmembrane active transport system then transfers the metabolites in the laticifer. The presumable role of parenchyma cells in the loading of laticifers is emphasized.

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Authors and Affiliations

  1. Laboratoire de Biologie des Ligneux, Université de Nancy I, Vandoeuvre les Nancy

    E. de Faÿ

  2. Institut de Recherche sur le Caoutchouc (I. R. C. A.), Montpellier

    C. Sanier

  3. Biologie Végétale, Université des Sciences et Techniques du Languedoc, Montpellier II, Montpellier

    C. Hebant

Authors
  1. E. de Faÿ
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  2. C. Sanier
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  3. C. Hebant
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de Faÿ, E., Sanier, C. & Hebant, C. The distribution of plasmodesmata in the phloem ofHevea brasiliensis in relation to laticifer loading. Protoplasma 149, 155–162 (1989). https://doi.org/10.1007/BF01322987

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  • DOI: https://doi.org/10.1007/BF01322987

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